MODULATORS OF THE FUNCTION OF FAS RECEPTORS AND OTHER PROTEINS

Abstract: The present invention provides proteins capable of modulating or mediating the FAS receptor ligand or TNF effect on cells carrying FAS receptor or p55 receptor by binding or interacting with MORT-1 protein, which in turn binds to the intracellular domain of the FAS receptor or to another protein TRADD which binds to the p55 receptor. In addition, peptide inhibitors which interfere with the proteolytic activity of MORT-1-binding proteins having proteolytic activity are provided as well as a method of designing them.

Description: MODULATORS OF THE FUNCTION OF FAS RECEPTORS AND OTHER PROTEINS Field of the Invention The present invention is generally in the field of receptors belonging to the TNF/NGF superfamily of receptors and the control of their biological functions. The TNF/NGF superfamily of receptors includes receptors such as the p55 and p75 tumor necrosis factor receptors (TNF-Rs, hereinafter called p55-R and p75-R) and the FAS ligand receptor (also called FAS/APOl or FAS-R and hereinafter will be called FAS-R) and others. More specifically, the present invention concerns novel proteins which bind to the protein MORT-1 (or FADD) , and more specifically, it relates to one such MORT-1 binding protein, herein designated MACH. Accordingly, the present invention concerns, in general, new proteins which are capable of modulating or mediating the function of MORT-1 or of other proteins which bind to MORT-1 directly or indirectly. In particular, the present invention concerns MACH, its preparation and uses thereof, as well as the various novel isoforms of MACH, their preparation and uses. Background of the Related Art Tumor Necrosis Factor (TNF-α) and Lymphotoxin (TNF-jS) (hereinafter, TNF, refers to both TNF-α and TNF-0) are multifunctional pro-inflammatory cytokines formed mainly by mononuclear phagocytes, which have many effects on cells (Wallach, D. (1986) In: Interferon 7 (Ion Gresser, ed.), pp. 83-122, Academic Press, London; and Beutler and Cerami (1987) ) . Both TNF-α and TNF-/3 initiate their effects by binding to specific cell surface receptors. Some of the effects are likely to be beneficial to the organism: they may destroy, for example, tumor cells or virus infected cells and augment antibacterial activities of granulocytes. In this way, TNF contributes to the defense of the organism against tumors and infectious agents and contributes to the recovery from injury. Thus, TNF can be used as an anti-tumor agent in which application it binds to its receptors on the surface of tumor cells and thereby initiates the events leading to the death of the tumor cells. TNF can also be used as an anti- infectious agent. However, both TNF-α and TNF-3 also have deleterious effects. There is evidence that overproduction of TNF-α can play a major pathogenic role in several diseases. For example, effects of TNF-α, primarily on the vasculature, are known to be a major cause for symptoms of septic shock (Tracey et al., 1986) . In some diseases, TNF may cause excessive loss of weight (cachexia) by suppressing activities of adipocytes and by causing anorexia, and TNF-α was thus called cachetin. It was also described as a mediator of the damage to tissues in rheumatic diseases (Beutler and Cerami, 1987) and as a major mediator of the damage observed in graft-versus-host reactions (Piquet et al. , 1987) . In addition, TNF is known to be involved in the process of inflammation and in many other diseases. Two distinct, independently expressed, receptors, the p55 and p75 TNF-Rs, which bind both TNF-α and TNF-/3 specifically, initiate and/or mediate the above noted biological effects of TNF. These two receptors have structurally dissimilar intracellular domains suggesting that they signal differently (See Hohmann et al. , 1989; Engelmann et al., 1990; Brockhaus et al. , 1990; Leotscher et al. , 1990; Schall et al. , 1990; Nophar et al. , 1990; Smith et al. , 1990; and Heller et al. , 1990) . However, the cellular mechanisms, for example, the various proteins and possibly other factors, which are involved in the intracellular signaling of the p55 an p75 TNF-Rs have yet to be elucidated. It is this intracellular signaling, which occurs usually after the binding of the ligand, i.e., TNF (α or β) , to the receptor, that is responsible for the commencement of the cascade of reactions that ultimately result in the observed response of the cell to TNF. As regards the above-mentioned cytocidal effect of TNF, in most cells studied so far, this effect is triggered mainly by the p55 TNF-R. Antibodies against the extracellular domain (ligand binding domain) of the p55 TNF-R can themselves trigger the cytocidal effect (see EP 412486) which correlates with the effectivity of receptor cross-linking by the antibodies, believed to be the first step in the generation of the intracellular signaling process. Further, mutational studies (Brakebusch et al. , 1992; Tartaglia et al. , 1993) have shown that the biological function of the p55 TNF-R depends on the integrity of its intracellular domain, and accordingly it has been suggested that the initiation of intracellular signaling leading to the cytocidal effect of TNF occurs as a consequence of the association of two or more intracellular domains of the p55 TNF-R. Moreover, TNF (α and β) occurs as a homotrimer, and as such, has been suggested to induce intracellular signaling via the p55 TNF-R by way of its ability to bind to and to cross-link the receptor molecules, i.e., cause receptor aggregation. Another member of the TNF/NGF superfamily of receptors is the FAS receptor (FAS-R) which has also been called the FAS antigen, a cell-surface protein expressed in various tissues and sharing homology with a number of cell- surface receptors including TNF-R and NGF-R. The FAS-R mediates cell death in the form of apoptosis (Itoh et al. , 1991) , and appears to serve as a negative selector of autoreactive T cells, i.e., during maturation of T cells, FAS- R mediates the apoptopic death of T cells recognizing self- antigens. It has also been found that mutations in the FAS-R gene (lpr) cause a lymphoproliferation disorder in mice that resembles the human autoimmune disease systemic lupus erythematosus (SLE) (Watanabe-Fukunaga et al. , 1992) . The ligand for the FAS-R appears to be a cell-surface associated molecule carried by, amongst others, killer T cells (or cytotoxic T lymphocytes - CTLs) , and hence when such CTLs contact cells carrying FAS-R, they are capable of inducing apoptopic cell death of the FAS-R-carrying cells. Further, a monoclonal antibody has been prepared that is specific for FAS-R, this monoclonal antibody being capable of inducing apoptopic cell death in cells carrying FAS-R, including mouse cells transformed by cDNA encoding human FAS-R (Itoh et al. , 1991) . While some of the cytotoxic effects of lymphocytes are mediated by interaction of a lymphocyte-produced ligand with the widely occurring cell surface receptor FAS-R (CD95) , which has the ability to trigger cell death, it has also been found that various other normal cells, besides T lymphocytes, express the FAS-R on their surface and can be killed by the triggering of this receptor. Uncontrolled induction of such a killing process is suspected to contribute to tissue damage in certain diseases, for example, the destruction of liver cells in acute hepatitis. Accordingly, finding ways to restrain the cytotoxic activity of FAS-R may have therapeutic potential. Conversely, since it has also been found that certain malignant cells and HIV-infected cells carry the FAS-R on their surface, antibodies against FAS-R, or the FAS-R ligand, may be used to trigger the FAS-R mediated cytotoxic effects in these cells and thereby provide a means for combating such malignant cells or HIV-infected cells (see Itoh et al., 1991) . Finding yet other ways for enhancing the cytotoxic activity of FAS-R may therefore also have therapeutic potential. It has been a long felt need to provide a way for modulating the cellular response to TNF (a or β) and FAS-R ligand. For example, in the pathological situations mentioned above, where TNF or FAS-R ligand is overexpressed, it is desirable to inhibit the TNF- or FAS-R ligand-induced cytocidal effects, while in other situations, e.g., wound healing applications, it is desirable to enhance the TNF effect, or in the case of FAS-R, in tumor cells or HIV- infected cells, it is desirable to enhance the FAS-R mediated effect. A number of approaches have been made by the laboratory of the applicants (see for example, European Application Nos. EP 186833, EP 308378, EP 398327 and EP 412486) to regulate the deleterious effects of TNF by inhibiting the binding of TNF to its receptors using anti-TNF antibodies or by using soluble TNF receptors (being essentially the soluble extracellular domains of the receptors) to compete with the binding of TNF to the cell surface-bound TNF-Rs. Further, on the basis that TNF-binding to its receptors is required for the TNF-induced cellular effects, approaches by the laboratory of of the applicants (see for example EPO 568925) have been made to modulate the TNF effect by modulating the activity of the TNF-Rs. Briefly, EPO 568925 relates to a method of modulating signal transduction and/or cleavage in TNF-Rs whereby peptides or other molecules may interact either with the receptor itself or with effector proteins interacting with the receptor, thus modulating the normal function of the TNF- Rs. In EPO 568925, there is described the construction and characterization of various mutant p55 TNF-Rs, having mutations in the extracellular, transmembrane, and intracellular domains of the p55 TNF-R. In this way, regions within the above domains of the p55 TNF-R were identified as being essential to the functioning of the receptor, i.e., the binding of the ligand (TNF) and the subsequent signal transduction and intracellular signaling which ultimately results in the observed TNF-effect on the cells. Further, there is also described a number of approaches to isolate and identify proteins, peptides or other factors which are capable of binding to the various regions in the above domains of the TNF-R, which proteins, peptides and other factors may be involved in regulating or modulating the activity of the TNF- R. A number of approaches for isolating and cloning the DNA sequences encoding such proteins and peptides; for constructing expression vectors for the production of these proteins and peptides; and for the preparation of antibodies or fragments thereof which interact with the TNF-R or with the above proteins and peptides that bind various regions of the TNF-R, are also set forth in EPO 568925. However, EPO 568925 does not specify the actual proteins and peptides which bind to the intracellular domains of the TNF-Rs (e.g., p55 TNF-R), nor does it describe the yeast two-hybrid approach to isolate and identify such proteins or peptides which bind to the intracellular domains of TNF-Rs. Similarly, heretofore there has been no disclosure of proteins or peptides capable of binding the intracellular domain of FAS-R. Thus, when it is desired to inhibit the effect of TNF, or the FAS-R ligand, it would be desirable to decrease the amount or the activity of TNF-Rs or FAS-R at the cell surface, while an increase in the amount or the activity of TNF-Rs or FAS-R would be desired when an enhanced TNF or FAS-R ligand effect is sought. To this end the promoters of both the p55 TNF-R and the p75 TNF-R have been sequenced, analyzed and a number of key sequence motifs have been found that are specific to various transcription regulating factors, and as such the expression of these TNF-Rs can be controlled at their promoter level, i.e., inhibition of transcription from the promoters for a decrease in the number of receptors, and an enhancement of transcription from the promoters for an increase in the number of receptors (EP 606869 and WO 9531206) . Corresponding studies concerning the control of FAS-R at the level of the promoter of the FAS-R gene have yet to be reported. While it is known that the tumor necrosis factor (TNF) receptors, and the structurally-related receptor FAS-R, trigger in cells, upon stimulation by leukocyte-produced ligands, destructive activities that lead to their own demise, the mechanisms of this triggering are still little understood. Mutational studies indicate that in FAS-R and the p55 TNF receptor (p55-R) signaling for cytotoxicity involve distinct regions within their intracellular domains (Brakebusch et al. , 1992; Tartaglia et al. , 1993; Itoh and Nagata, 1993) . These regions (the 'death domains') have sequence similarity. The 'death domains' of both FAS-R and p55-R tend to self- associate. Their self-association apparently promotes that receptor aggregation which is necessary for initiation of signaling (see Song et al . , 1994; Wallach et al. , 1994; Boldin et al., 1995), and at high levels of receptor expression can result in triggering of ligand-independent signaling (Bolding et al. , 1995) . Thus, prior to WO 9531544 and the present invention, there have not been provided proteins which may regulate the effect of ligands belonging to the TNF/NGF superfamily, such as the TNF or FAS-R ligand effect on cells, by mediation of the intracellular signaling process, which signaling is believed to be governed to a large extent by the intracellular domains (ICs) of the receptors belonging to the TNF/NGF superfamily of receptors, such as those of the TNF-Rs, i.e. the p55 and p75 TNF-R intracellular domains (p55IC and p75IC, respectively) , as well as the FAS-IC. Some of the cytotoxic effects of lymphocytes are mediated by interaction of a lymphocyte-produced ligand with FAS-R (CD-95) , a widely occurring cell surface receptor which has the ability to trigger cell death (see Nagata and Golstein, 1995) . Cell killing by mononuclear phagocytes involves a ligand-receptor couple, TNF and its receptor p55-R (CD120) , that is structurally related to FAS-R and its ligand (see also Vandenabeele et al., 1995) . Like other receptor- induced effects, cell death induction by the TNF receptors and FAS-R occurs via a series of protein-protein interactions, leading from ligand-receptor binding to the eventual activation of enzymatic effector functions, which in the case of these particular receptors results in cell death. Previous studies have elucidated non-enzymatic protein-protein interactions that initiate signaing for cell death: binding of trimeric TNF or the FAS-R ligand molecules to the receptors, the resulting interactions of their intracellular domains (Brakebusch et al. , 1992; Tartaglia et al. , 1993; Itoh and Nagata, 1993) augmented by a propensity of th death-domain motifs to self-associate, (Boldin et al. , 1995a) , and induced binding of two cytoplasmic proteins (which can also bind to each other) to the receptors' intracellular domains - MORT-1 (or FADD) to FAS-R (Boldin et al. , 1995b; Chinnaiyan et al. , 1995; Kischkel et al. , 1995) and TRADD to p55-R (Hsu et al. , 1995; Hsu et al. , 1996) . Three proteins that bind to the intracellular domain of FAS-R and p55-R at the "death domain" region involved in cell-death induction by the receptors through hetero- association of homologous regions and that independently are also capable of triggering cell death were identified by the yeast two-hybrid screening procedure. One of these is the protein, MORT-1 (Boldin et al. 1995b) also known as FADD (Chinnaiyan et al . , 1995) , that binds specifically to FAS-R. A second one, TRADD (see also Hsu et al. , 1995, 1996), binds to p55-R, and the third, RIP (see also Stanger et al. , 1995), binds to both FAS-R and p55-R. Besides their binding to FAS-R and p55-R, these proteins are also capable of binding to each other, which provides for a functional "cross-talk" between FAS-R and p55-R. These bindings occur through a conserved sequence motif, the "death domain module" common to the receptors and their associated proteins. Furthermore, although in the yeast two-hybrid test MORT-1 was shown to bind spontaneously to FAS-R, in mammalian cells this binding takes place only after stimulation of the receptor, suggesting that MORT-1 participates in the initiating events of FAS-R signaling. MORT-1 does not contain any sequence motif characteristic of enzymatic activity, and therefore, its ability to trigger cell death seems not to involve an intrinsic activity of MORT-1 itself, but rather, activation of some other protein(s) that bind MORT-1 and act further downstream in the signaling cascade. Cellular expression of MORT-1 mutants lacking the N-terminal part of the molecule has been shown to block cytotoxicity induction by FAS/APOl (FAS-R) or p55-R (Hsu et al. , 1996; Chinnaiyan et al. , 1996), indicating that this N-terminal region transmits the signaling for the cytocidal effect of both receptors through protein- protein interactions. Recent studies have implicated a group of cytoplasmic thiol proteases which are structurally related to the Caenσrhab itis elegans protease CED3 and to the mammalian interleukin- iβ converting enzyme (ICE) in the onset of various physiological cell death processes (reviewed in Kumar, 1995 and Henkart, 1996) . There have also been some indications that protease (s) of this family may take part in the cell- cytotoxicity induced by FAS-R and TNF-Rs. Specific peptide inhibitors of the proteases and two virus-encoded proteins that block their function, the cowpox protein crmA and the Baculovirus p35 protein, were found to provide protection to cells against this cell-cytotoxicity (Enari et al. , 1995; Los etal., 1995; Tewari et al. , 1995; Xue et al. , 1995; Beidler et al., 1995) . Rapid cleavage of certain specific cellular proteins, apparently mediated by protease (s) of the CED3/ICE family, was observed in cells shortly after stimulation of FAS-R or TNF-Rs. Heretofore, no information has been presented as to the identity of the specific CED3/ICE-related protease (s) involved, nor of the mechanisms of activation of these protease (s) by the receptors. SUMMARY OF THE INVENTION It is an object of the invention to provide novel proteins, including all isoforms, analogs, fragments or derivatives thereof, which are capable of binding to MORT-1, which itself binds to the intracellular domain of the FAS-R, which novel proteins affect the intracellular signaling process initiated by the binding of FAS ligand to its receptor. Another object of the invention is to provide antagonists (e.g., antibodies, peptides, organic compounds, or even some isoforms) to the above novel proteins, analogs, fragments and derivatives thereof, which may be used to inhibit the signaling process, or, more specifically, the cell-cytotoxicity, when desired. A further object of the invention is to use the above novel proteins, analogs, fragments and derivatives thereof, to isolate and characterize additional proteins or factors, which may be involved in regulation of receptor activity, e.g., other proteases which cleave the novel proteins to render them biologically active, and/or to isolate and identify other receptors further upstream in the signaling process to which these novel proteins, analogs, fragments and derivatives bind (e.g., other FAS-Rs or related receptors), and hence, in whose function they are also involved. A still further object of the invention is to provide inhibitors which can be introduced into cells to bind or interact with the MACH proteases and inhibit their proteolytic activity. Moreover, it is an object of the present invention to use the above-mentioned novel proteins, and analogs, fragments and derivatives thereof as antigens for the preparation of polyclonal and/or monoclonal antibodies thereto. The antibodies, in turn, may be used, for example, for the purification of the new proteins from different sources, such as cell extracts or transformed cell lines. Furthermore, these antibodies may be used for diagnostic purposes, e.g., for identifying disorders related to abnormal functioning of cellular effects mediated by the FAS-R or other related receptors. A further object of the invention is to provide pharmaceutical compositions comprising the above novel proteins, or analogs, fragments or derivatives thereof, as well as pharmaceutical compositions comprising the above noted antibodies or other antagonists. In accordance with the present invention, a novel protein, MACH, which is capable of binding to, or interacting with, MORT-1, which itself binds to the intracellular domain of the FAS-R was discovered. MACH probably functions as an effector component of the cell-death pathway initiated by the binding of FAS ligand to FAS-R at the cell surface, and this by virtue of the fact that at least some of the isoforms of MACH appear to be active intracellular proteases. Proteases of the CED3/ICE family have been implicated in the apoptopic process triggered by FAS-R. MORT-1 (or FADD) binds to the intracellular domain of FAS-R upon activation of this receptor and the novel MACH proteins of the present invention bind to MORT-1. The MACH protein, cloned and characterized in accordance with the present invention, actually exists in multiple isoforms, some of which isoforms have a CED3/ICE homology region which has proteolytic activity (proteolytic domain) , and causes the death of cells when expressed in the cells. Thus, activation of this novel CED3/ICE homolog (i.e., the various MACH isoforms having the proteolytic domain) by FAS-R (via MORT-1 interaction) appears to constitute an effector component of the FAS-R-mediated cell-death pathway. Moreover, MACH also appears to function as an effector component of the cell-death pathway initiated by the binding of TNF to p55-R at the cell surface, this by way of indirect mechanism of MORT-1 binding to TRADD, a protein which binds to the intracellular domain of p55-R (Hsu et al. , 1995), followed by or together with MACH binding to MORT-1, with the activation of MACH into an active protease involved in effecting cell death. It should also be noted that while MACH, in particular, the MACHαl isoform, displays all of the sequence features critical of the function of the CED3/ICE proteases, it does, however, have some distinctive sequence features of its own which may endow it with a unique and possibly tissue/cell specific mode of action. MORT-1 (for 'Mediator of Receptor Toxicity', Boldin et al., 1995b), previously designated HF1, is capable of binding to the intracellular domain of the FAS-R. This FAS- IC-binding protein appear to act as a mediator or modulator of the FAS-R ligand effect on cells by way of mediating or modulating the intracellular signaling process which usually occurs following the binding of the FAS-R ligand at the cell surface. In addition to its FAS-IC-binding specificity, MORT- 1 was shown to have other characteristics (see Example 1) , for example, it has a region homologous to the "death domain" (DD) regions of the p55-TNF-R and FAS-R (p55-DD and FAS-DD) , and thereby is also capable of self-association. MORT-l is also capable of activating cell cytotoxicity on its own, an activity possibly related to its self-association capability. It has now also been found that co-expression of the region in MORT-l (HF1) that contains the "death domain" homology seguence (MORT-DD, present in the C-terminal part of MORT-l) strongly interferes with FAS-induced cell death, as would be expected from its ability to bind to the "death domain" of the FAS-IC. Further, in the same experimental conditions, it was found that co-expression of the part of MORT-l that does not contain the MORT-DD region (the N-terminal part of MORT-l, amino acids 1-117, "MORT-l head") resulted in no interference of the FAS-induced cell death and, if at all, a somewhat enhanced FAS-induced cell cytotoxicity. Accordingly, it is likely that MORT-l also binds to other proteins involved in the intracellular signaling process. These MORT-l-binding proteins may therefore also act as indirect mediators or modulators of the FAS-R ligand effect on cells by way of mediating or modulating the activity of MORT-l; or these MORT-l-binding proteins may act directly as mediators or modulators of the MORT-1-associated intracellular signaling process by way of mediating or modulating the activity of MORT-l, which, as noted above, has an apparently independent ability to activate cell cytotoxicity. These MORT-l-binding proteins may also be used in any of the standard screening procedures to isolate, identify and characterize additional proteins, peptides, factors, antibodies, etc., which may be involved in the MORT-l- associated or FAS-R-associated signaling process or may be elements of other intracellular signaling processes. Such MORT-l-binding proteins have been isolated and are described herein (see Example 2 and Example 3) . One of these MORT-l- binding proteins, herein designated MACH, was initially cloned, sequenced, and partially characterized as having the following properties: The MACH cDNA encodes the ORF-B open- reading frame; MACH binds to MORT-l in a very strong and specific manner; the MACH binding site in MORT-l occurs upstream of the MORT-l "death domain" motif; the ORF-B region of MACH is the MORT-l-interacting part thereof; and MACH is capable of self-association and of inducing cell-cytotoxicity on its own. In accordance with the present invention, it has now been shown as mentioned above, that MACH actually exists in a number of isoforms. Moreover, the MACH ORF-B noted above is in fact one of the MACH isoforms designated herein as MACH/Jl (see below) . Accordingly, the present invention provides a DNA sequence encoding a protein, analogs or fragments thereof, capable of binding to or interacting with MORT-l, said protein, analogs or fragments thereof being capable of mediating the intracellular effect mediated by the FAS-R or p55-TNF-R. In particular, the present invention provides a DNA sequence selected from the group consisting of : (a) a cDNA sequence derived from the coding region of a native MORT-l binding protein; (b) DNA sequences capable of hybridization to a sequence of (a) under moderately stringent conditions and which encode a biologically active MORT-l binding protein; and (c) DNA sequences which are degenerate as a result of the genetic code to the DNA sequences defined in (a) and (b) and which encode a biologically active MORT-l binding protein. Another specific embodiment of the above DNA sequence of the invention is a DNA sequence comprising at least part of the sequence encoding at least one isoform of the MACH protein selected from the herein designated MACH isoforms MACHαl, MACHα2, MACHα3, MACH/?2, MACH01, MACH03, MACH04 and MACH05. Other specific embodiments of the DNA sequence of the invention as noted above are DNA sequences encoding: (a) a MACH isoform selected from MACHαl, MACH/31 and MACH/J3 having an amino acid sequence set forth in SEQ ID NOs:7, 5 and 8 respectively, and analogs and fragments of any one thereof; (b) MACHαl having the amino acid sequence set forth in SEQ ID NO: 7, and analogs and fragments thereof; (c) MACH/Jl having the amino acid sequence set forth in SEQ ID NO:5, and analogs and fragments thereof; (d) MACH/33 having the amino acid sequence set forth in SEQ ID NO: 8, and analogs and fragments thereof. In the present invention provides MORT-l-binding proteins, and analogs, fragments or derivatives thereof encoded by any of the above sequences of the invention, said proteins, analogs, fragments and derivatives being capable of binding to or interacting with MORT-l and mediating the intracellular effect mediated by the FAS-R or p55 TNF-R. A specific embodiment of the invention is the MORT- 1-binding protein, analogs fragments and derivatives thereof, which are selected from as least one isoform of MACH of the group comprising MACHαl, MACHα2, MACHα3 , MACH/31, MACH32 , MACH03, MACH04 and MACH05 which have at least part of the amino acid sequenceε thereof. Also provided by the present invention are vectors encoding the above MORT-l-binding protein, and analogs, fragments or derivatives of the invention, which contain the above DNA sequence of the invention, these vectors being capable of being expressed in suitable eukaryotic or prokaryotic host cells; transformed eukaryotic or prokaryotic host cells containing such vectors; and a method for producing the MORT-l-binding protein, or analogs, fragments or derivatives of the invention by growing such transformed host cells under conditions suitable for the expression of said protein, analogs, fragments or derivatives, effecting post¬ translational modifications of said protein as necessary for obtaining said protein and extracting said expressed protein, analogs, fragments or derivatives from the culture medium of said transformed cells or from cell extracts of said transformed cells. The above definitions are intended to include all isoforms of the MACH protein. In another aspect, the present invention also provides antibodies or active derivatives or fragments thereof specific the MORT-l-binding protein, and analogs, fragments and derivatives thereof, of the invention. By yet another aspect of the invention, there are provided various uses of the above DNA sequences or the proteins which they encode, according to the invention, which uses include amongst others: (i) A method for the modulation of the FAS-R ligand or TNF effect on cells carrying a FAS-R or p55-R, comprising treating said cells with one or more MORT-l-binding proteins, analogs, fragments or derivatives of the invention, capable of binding to MORT-l, which binds to the intracellular domain of FAS-R, or capable of binding to MORT-l which binds to TRADD which binds to the intracellular domain of p55-R, and thereby being capable of modulating/mediating the activity of said FAS-R or p55 TNF-R, wherein said treating of said cells comprises introducing into said cells said one or more proteins, analogs, fragments or derivatives in a form suitable for intracellular introduction thereof, or introducing into said cells a DNA sequence encoding said one or more proteins, analogs, fragments or derivatives in the form of a suitable vector carrying said sequence, said vector being capable of effecting the insertion of said sequence into said cells in a way that said sequence is expressed in said cells. (ii) A method for the modulation of the FAS-R ligand or TNF effect on cells according to (i) above, wherein said treating of cells comprises introducing into said cells said MORT-l-binding protein, or analogs, fragments or derivatives thereof, in a form suitable for intracellular introduction, or introducing into said cells a DNA sequence encoding said MORT-l-binding protein, or analogs, fragments or derivatives in the form of a suitable vector carrying said sequence, said vector being capable of effecting the insertion of said sequence into said cells in a way that said sequence is expressed in said cells. (iii) A method as in (ii) above wherein said treating of said cells is by transfection of said cells with a recombinant animal virus vector comprising the steps of : (a) constructing a recombinant animal virus vector carrying a sequence encoding a viral surface protein (ligand) that is capable of binding to a specific cell surface receptor on the surface of a FAS-R- or p55-R-carrying cell and a second sequence encoding a protein selected from MORT-l-binding protein, and analogs, fragments and derivatives thereof, that when expressed in said cells is capable of modulating/mediating the activity of said FAS-R or p55-R; and (b) infecting said cells with said vector of (a) . (iv) A method for modulating the FAS-R ligand or TNF effect on cells carrying a FAS-R or a p55-R comprising treating said cells with antibodies or active fragments or derivatives thereof, according to the invention, said treating being by application of a suitable composition containing said antibodies, active fragments or derivatives thereof to said cells, wherein when the MORT-l-binding protein, or portions thereof of said cells are exposed on the extracellular surface, said composition is formulated for extracellular application, and when said MORT-l-binding proteins are intracellular, said composition is formulated for intracellular application. (v) A method for modulating the FAS-R ligand or TNF effect on cells carrying a FAS-R or p55-R comprising treating said cells with an oligonucleotide sequence encoding an antisense sequence of at least part of the MORT-l-binding protein sequence of the invention, said oligonucleotide sequence being capable of blocking the expression of the MORT-l-binding protein. (vi) A method as in (ii) above for treating tumor cells or HIV-infected cells or other diseased cells, comprising: (a) constructing a recombinant animal virus vector carrying a sequence encoding a viral surface protein capable of binding to a specific tumor cell surface receptor or HIV- infected cell surface receptor or receptor carried by other diseased cells and a sequence encoding a protein selected from MORT-l-binding protein, analogs, fragments and derivatives of the invention, that when expressed in said tumor, HIV- infected, or other diseased cell is capable of killing said cell; and (b) infecting said tumor or HIV-infected cells or other diseased cells with said vector of (a) . (vii) A method for modulating the FAS-R ligand or TNF effect on cells comprising applying the ribozyme procedure in which a vector encoding a ribozyme sequence capable of interacting with a cellular mRNA sequence encoding a MORT-1- binding protein according to the invention, is introduced into said cells in a form that permits expression of said ribozyme sequence in said cells, and wherein when said ribozyme sequence is expressed in said cells it interacts with said cellular mRNA sequence and cleaves said mRNA sequence resulting in the inhibition of expression of said MORT-1- binding protein in said cells. (viii) A method selected from the method according to the invention, wherein said MORT-l-binding protein encoding sequence comprises at least one of the MACH isoforms, analogs, fragments and derivatives of any thereof according to the invention which are capable of binding specifically to MORT-l which in turn binds specifically to FAS-IC, or which are capable of binding to MORT-l which in turn binds to TRADD and which in turn binds to the p55-IC. (ix) A method for isolating and identifying proteins, according to the invention, capable of binding to the MORT-l protein, comprising applying the yeast two-hybrid procedure in which a sequence encoding said MORT-l protein is carried by one hybrid vector and sequence from a cDNA or genomic DNA library is carried by the second hybrid vector, the vectors then being used to transform yeast host cells and the positive transformed cells being isolated, followed by extraction of the said second hybrid vector to obtain a sequence encoding a protein which binds to said MORT-l protein, said protein being the MORT-l-binding proteins. (x) A method according to any one of (i)-(ix) above wherein said MORT-l-binding protein is the MACH isoform herein designated MACHαl, analogs, fragments and derivatives thereof. (xi) A method according to any one of (i) - (ix) above wherein said MORT-l-binding protein is the MACH isoform herein designated MACHβl, analogs, fragments and derivatives thereof. (xii) A method according to any one of (i) - (ix) above wherein said MORT-l-binding protein is the MACH isoform herein designated MACH/33, analogs, fragments and derivatives thereof. The present invention also provides a pharmaceutical composition for the modulation of the FAS-R ligand- or TNF- effect on cells comprising, as active ingredient any one of the following : (i) a MORT-l-binding protein according to the invention, and biologically active fragments, analogs, derivatives or mixtures thereof; (ii) a recombinant animal virus vector encoding a protein capable of binding a cell surface receptor and encoding a MORT-l-binding protein or biologically active fragments or analogs, according to the invention; (iii) an oligonucleotide sequence encoding an anti-sense seguence of the MORT-l-binding protein sequence according to the invention, wherein said oligonucleotide may be the second sequence of the recombinant animal virus vector of (ii) above. The present invention also provides : I. a method for the modulation of the MORT-1- induced effect or MORT-l-binding protein-induced effect on cells comprising treating said cells in accordance with a method of any one of (i)-(xi) above, with MORT-l-binding proteins, analogs, fragments or derivatives thereof or with sequences encoding MORT-l-binding proteins, analogs or fragments thereof, said treatment resulting in the enhancement or inhibition of said MORT-l-mediated effect, and thereby also of the FAS-R or p55-R-mediated effect. II. a method as above wherein said MORT-l-binding protein, analog, fragment or derivative thereof is that part of the MORT-l-binding protein which is specifically involved in binding to MORT-l or MORT-l-binding protein itself, or said MORT-l-binding protein sequence encodes that part of MORT-l- binding protein which is specifically involved in binding to MORT-l or the MORT-l-binding protein itself. III. A method as above wherein said MORT-l-binding protein is any one of the MACH isoforms selected from MACHαl, MACH31, and MACH03, said MACH isoforms capable of enhancing the MORT-1-associated effect on cells and thereby also of enhancing the FAS-R- or p55-R-associated effect on cells. As arises from all the above-mentioned, as well as from the detailed description hereinbelow, MACH may be used in a MORT-l independent fashion to treat cells or tissues. Isolation of the MORT-l-binding proteins, their identification and characterization may be carried out by any of the standard screening techniques used for isolating and identifying proteins, for example, the yeast two-hybrid method, affinity chromatography methods, and any of the other well-known standard procedures used for this purpose. Other aspects and embodiments of the present invention are also provided as arising from the following detailed description of the invention. It should be noted that, where used throughout, the following terms: "Modulation of the FAS-ligand or TNF effect on cells"; and "Modulation of the MORT-l or MORT-l-binding protein effect on cells" are understood to encompass in vi tro as well as in vivo treatment. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows the interaction of MORT-l with FAS-IC and the self-association of MORT-l within transformed yeasts as assessed by a two-hybrid /3-galactosidase expression test. Figure 2 depicts schematically the preliminary nucleotide (SEQ ID NO:l) and deduced amino acid sequence (SEQ ID NO:2) of MORT-l (HF1) in which the 'death domain' is underlined as is a possible translation start site, i.e., the underlined methionine residue at position 49 (bold, underlined M) . The asterisk indicates the translation stop codon (nucleotides 769-771) . At the beginning and in the middle of each line are provided two numerals depicting the relative positions of the nucleotides and amino acids of the sequence with respect to the start of the sequence (5' end), in which the first numeral denotes the nucleotide and the second numeral denoted the amino acid. Figure 3 is a preliminary partial nucleotide sequence encoding a MORT-l-binding protein as obtained from a cDNA clone. Figures 4A-C depict schematically the MACH cDNA and its encoded protein, wherein in Fig. 4A there is shown the structure of the MACH cDNA which encodes two MACH open-reading frames (ORF-A and ORF-B) , the hatched area of ORF-B indicating the region thereof having homology with the MORT-l protein; in Fig. 4B, there is shown the deduced amino acid sequence (SEQ ID NO:5) for the MACH ORF-B region, the underlined amino acid residues being the region having homology with MORT-l (corresponding to the hatched region of Fig. 4A) ; and in Fig. 4C, there is shown the nucleotide sequence (SEQ ID N0:4) of the entire MACH cDNA molecule (designated MACH/3D . Figure 5 depicts the results illustrating the interaction of MORT-l and MACH within transfected yeast cells. Figure 6 depicts graphically the ligand-independent triggering of cytocidal effects in HeLa cells transfected with tetracycline-controlled expression vectors encoding MACH, as compared to the effects in these cells transfected with such vectors encoding other proteins such as luciferase (luc, negative control), FAS-IC, MORT-l, and cells co-transfected with vectors encoding MORT-l and MACH. Figures 7A and 7B show the amino acid sequence (SEQ ID NO:5) of MACHβl (Fig. 7A) . Fig. 7B shows the sequence homology of the MORT module in MACH01, MORT-l and PEA-15 (SEQ ID NO:6) . Figure 8 is a diagrammatic representation of the receptor and target interactions participating in induction of cell-death by Fas/APOl and p55, the death domain module being indicated by stripes, the MORT module being indicated in gray and the CED3/ICE region being indicated in black. Figures 9A-C depict the results illustrating the in vi tro interaction of MACHjSl and its deletion mutants with MORT-l. Fig. 9A shows the assessment of the expression of the proteins and their molecular sizes by immunoprecipitation from cell lysates using anti-FLAG antibody. Fig. 9B shows affinity binding of the proteins to GST-MORT-1, adsorbed to glutathione-agarose beads (or, as a control, to GST or GST- fused to the intracellular domain of Fas-APOl) . Fig. 9C shows the results of the immunoprecipitations of the various MORT-l and MACH fusion constructs using the various specific antibodies. Figure 10 is a diagrammatic representation of the various MACH isoforms. Figure 11 is a schematic colinear amino acid seguence alignment of the MACH isoforms, MACHαl (SEQ ID NO:7) , MACH01 (SEQ ID NO:5) , and MACH03 (SEQ ID NO:8) and the various known members of the CED3/ICE protease family, CED-3 (SEQ ID NO:9) , Ich-ll/Nedd2 (SEQ ID NO:10), ICE rcl III (SEQ ID NO:ll) , Tx/lch2/ICE rel II (SEQ ID NO:12), ICE (SEQ ID NO:13), CPP-32 (SEQ ID NO:30), Mcn2α (SEQ ID NO:31) . Amino acid residues are numbered both to the left and to the right of each sequence. Dotted lineε; gaps in the sequence to allow optimal alignment. Amino acids that are identical in at least three of the members of the CED3/ICE protease family show are boxed. The MORT modules upstream to CED3/ICE homology region are boxed. Sites of C-terminal deletions employed in this study are denoted by broken lines . The four amino acid blocks downstream to the MORT module region, which vary among the various MACH isoforms (blocks 1-4) are denoted by overlinings. Within the CED3/ICE homology region, amino acids aligning with residues within ICE implicated in catalytic activity by X-ray crystal analysis are denoted as follows: The residues putatively involved in catalysis, corresponding to His 237 , Gly 238 and Cys 285 in ICE are marked by closed circles below the alignment (•) . The residues constituting the binding pocket for the carboxylate side chain of the Pl Asp, corresponding to Arg 179 , corresponding to Arg 179 , Gln 283 , Arg 341 and Ser^, in ICE, are marked by open circles below the alignment (O) . The Ala residues upstream to the residues corresponding to Cys 285 in ICE, and the Arg and Gly residues downstream to this Cys, which are conserved in all previously described proteases of the CED3/ICE family. Residues proximal to P,-P 4 residues of the substrate are marked by triangles below the alignment (Δ) . Known and previously suspected Asp-X cleavage sites and potential sites of cleavage found at similar locations in MACH are Jboxed. Arrows indicate the N- and C-terminal ends of the p20 and plO subunits of ICE and of the pl7 and pl2 subunits of CPP32. The C-termini of the proteins are denoted by asterisks ( * ) . Figures 12A-F depict the results illustrating the protease activity of MACHαl at 15 min. (Fig. 12A) , 30 min. (Fig. 12B) , 60 min. (Fig. 12C) , 90 min. (Fig. 12D) , 180 min. (Fig. 12E) . Fig. 12F shows the proteolytic activity over time at a specific concentration of substrate. Figures 13A and 13B show the protease activity of the CED3/ICE homology region in MACHα.A, Kinetics of cleaage of the PARP-sequence-derived fluorogenic substrate, Ac-DEVD- AMC (50 μM) , by extracts of E. coli expressing a GST-fusion protein of the CED3/ICE homology region in MACHαl (Ser 2 through the C-terminus of the protein (■) as compared to the lack of cleavage by extracts of bacteria expressing GST-fusion products of the full-length MACHαl (O) , or of the CED3/ICE homology region in which Cys 360 was replaced by Ser (V) , or by extracts of bacteria expressing GST-fusion products of either of the two potential proteolytic products of the CED3/ICE homology region (Ser 217 though Asp 373 (Δ) and Ser 375 through Asp 479 , the C-terminus of the protein (A) ) . B, Substrate-concentration dependence of the cleavage of Ac-DEVD-AMC. The substrate was incubated for 180 min with extracts of bacteria expressing the GST-fusion product of the MACHαl CED3/ICE homology region (■) . Cleavage of this substrate by the extracts was inhibited in the presence of iodoacetic acid (5 mM, D) . Ac-YVAD-AMC, a fluorogenic substrate corresponding to an ICE cleavage site in the IL-13 precursor, was not cleaved (•) . Figures 14A-D show cell death mediated by MACHαl and MACHα2. Figure 15 depict graphically cell death mediated by MACHαl and MACHα2. Figures 16A-D show the morphology of cells in which cell death was induced or blocked. Figure 17 graphically shows that MACHα molecules that contain a non-functional CED3/ICE region block cell death induction by p55-R. Figure 18 shows that MACHα molecules that contain a non-functional CED3/ICE region block cell death induction by FAS/APOl. Figure 19 shows death of HeLa cells that transiently express FAS/APOl. DETAILED DESCRIPTION OF THE INVENTION The present invention relates, in one aspect, to novel MORT-l-binding proteins which are capable of binding to or interacting with MORT-l and thereby of binding to the intracellular domain of the FAS-R receptor, to which MORT-l binds, or of binding to the intracellular domain of the p55 TNF-R, to which the protein TRADD (see Example 2 and as noted above) binds and to which TRADD protein MORT-l binds. Hence, the MORT-l binding proteins of the present invention are considered as mediators or modulators of FAS-R, having a role in, for example, the signaling process that is initiated by the binding of FAS ligand to FAS-R, and likewise also having a role in the signaling process that is initiated by the binding of TNF to p55-R. Of the MORT-l-binding proteins of the present invention are included the newly discovered MACH isoforms, the amino acid and DNA sequences of which are new sequences not appearing in the 'GENBANK' or 'PROTEIN BANK' data banks of DNA or amino acid sequences. More particularly, in accordance with the present invention, several mammalian homologs of the nematode protease, CED3 have been disclosed. These have been designated as MACH isoforms (MACHα and MACH/3 isoforms) which, although being closely related, do however display some differences of structure and of substrate specificity, and as such may serve somewhat different functions in mammalian cells. Indeed, two different activities of the proteases are known. The main role of ICE seems to be the processing of the IL-ljS precursor, while CED3 has been clearly shown to serve as an effector of programmed cell death. This latter role also appears to be the role of at least some of the mammalian homologs (some MACH isoforms) . The amino acid sequence of MACHαl shows closest resemblance to CPP32, the closest known mammalian homolog of CED3. The substrate specificity of MACH is also similar to that of CPP32, except that MACHαl seems to have a more restricted substrate specificity than that of CPP32. CPP32 cleaves preferentially the substrate peptide corresponding to a cleavage site in poly (ADP ribose) polymerase (PARP) , yet also has some proteolytic activity against the peptide corresponding to the ICE cleavage site in the IL-13 precursor. MACHαl seems, however, to be solely capable of cleaving the PARP-derived sequence. These relationships of MACHαl to CPP32 and CED3, and its dissimilarities to ICE, are consistent with the idea that MACHαl serves, similarly to CED3, as regulator of cell death. MACHαl displays, though, some sequence features which distinguish it from CED3 and from CPP32, as well as from all other members of the CED3/ICE family. The C terminal part of MACHαl, upstream to its CED3/ICE homology region, shows no resemblance at all to the upstream region of any of the other homologs. There are also some unique sequence features to the CED3/ICE homology region of the protein. These differences suggest that MACHαl belongs to a distinct evolutionary branch of the family and that its contribution to cell death somewhat differs from that of the previously described CED3/ICE homologs. One important difference may concern the way in which the function of the protease is regulated. Being involved both in developmentally related cell death processes and in receptor-induced immune cytolysis, the cleavage of proteins by proteases of the CED3/ICE family should be amenable to regulation both by signals that are formed within the cell and by signals emanating from cell surface receptors. In developmental cell death processes, the activation of such proteases seems to involve mechanisms that affect gene expression, resulting in enhanced synthesis of the proteases, as well as in decreased synthesis of proteins like BCL-2, that antagonize their apoptopic effect. This is clearly not the case, however, for the cytotoxicity triggered by FAS-R or the TNF receptors. Cells can be killed by TΝF or the FAS-R ligand even when their protein synthesis activity is fully blocked (they are in fact killed more effectively then) and remain stimulus-dependent under these conditions. Activation of proteases of the CED3/ICE family by the TΝF receptors and FAS- R may thus occur by a mechanism which is protein-synthesis- independent. The unique sequence properties of MACHαl may allow it to take part in such a mechanism. To applicants' knowledge, no other protease has so far been found to associate, either directly or through an adapter protein, with the intracellular domain of a cell surface receptor. Yet by inference from the way of action of receptor-associated proteins that have other enzymatic activities, it seems plausible that the binding of MACHαl to M0RT1 allows stimulation of the MACHαl protease-activity upon triggering of FAS-R. It may also allow activation of the protease by the p55-R, through the binding of M0RT1 to TRADD, which binds to p55-R. Other members of the CED3/ICE family were found to exhibit full activity only after proteolytic processing, which occurs either by their self-cleavage or by effects of other proteases of this family (reviewed in Kumar, 1995; Henkart, 1996) . The cytotoxic effect resulting from co-expression of the two major potential self-cleavage products of MACHαl, as opposed to the lack of cytotoxicity in cells that express the full-length CED3/ICE homology region, is consistent with the possibility that also MACHαl gains full activity only after its processing. The enzymatic activity observed in lysates of bacteria that express the full length region apparently reflect self processing of the protein produced under these conditions or processing by some bacterial proteases. In what way this processing occurs within the mammalian cell, and how it can be brought about by triggering of FAS-R and p55-R, is not known, nor is it clear yet what relative contribution the protease activity of MACHαl makes to the FAS-R- and TNF- induced cytotoxicity. Evaluation of this contribution is complicated by the fact that also expression of MACHjSl, which lacks the CED3/ICE homology region, results in marked cytotoxicity. Presumably, this cytotoxicity reflects the ability of MACH31 to bind to MACHαl. Due to this ability, transfected MACH molecules may impose, upon aggregation, a conformational change in the MACHαl molecules that are endogenous to the transfected cell . Such a mechanism may well account also for the cytotoxicity observed when molecules that act upstream to MACH, (MORT1, TRADD or the death domains of either the p55-R or FAS-R) are over-expressed in cells. At the moment, however, one cannot exclude that the cytotoxicity observed upon induced expression of MACH or of molecules that act upstream to it reflect, besides the proteolytic activity of the CED3/ICE homology region in MACH, also activation of some of the other mechanisms believed to take part in the FAS- R and p55-R cytotoxic effect (for example, activation of the neutral or acid sphingomyelinase) . One also cannot exclude that the proteolytic activity of the CED3/ICE homology region serves other functions besides cytotoxicity induction. A clearer idea of the function of MACHαl should be gained by identification of the endogenous substrate proteins that are cleaved upon activation of MACHαl . Finding ways to ablate the activity of MACHαl at will, for example by expression of inhibitory molecules, will also contribute to understanding of the function of this protein, and serve as a way for regulating its activity when desired. There may well exist within cells that express MACHαl natural inhibitors of the protease encompassed in this protein. Existence of alternatively spliced isoforms for some of the other members of the CED3/ICE family has been shown to constitute a way of physiological restriction of the function of these proteases. Some of the isoforms of these other proteases were reported to act as natural inhibitors of the full-length isoforms, apparently by forming inactive heterodimers, with them. This may well be the case also for some isoforms of MACH, for example, MACHα3, in which the potential N-terminal cleavage site is missing and MACHαl mutants whose CED3/ICE homology region is deficient. Expression of such inhibitory isoforms may constitute a mechanism of cellular self-protection against the FAS-R and TNF cytotoxicity. The wide heterogeneity of MACH isoforms, which greatly exceeds the heterogeneity observed for any of the other proteases of the CED3/ICE family, may allow a particularly refined tuning of the function of the active form of this protein. It seems also possible that some of the MACH isoforms serve other functions. The ability of MACH01 to bind both to M0RT1 and to MACHαl raises the possibility that some of these isoforms, and perhaps also other MACH isoforms, do not have an inhibitory but rather an enhancing effect on the function of the enzymatically active isoforms. It seems also possible that some isoforms do not serve a role related to cytotoxicity, but rather act as docking sites for molecules that are involved in other, non-cytotoxic, effects of FAS-R and TNF. Due to the unique ability of FAS-R and the TNF receptors to cause cell death, as well as the ability of the TNF receptors to trigger various other tissue-damaging activities, aberration of the function of these receptors can be particularly deleterious to the organism. Indeed, both excessive and deficient function of these receptors have been shown to contribute to the pathological manifestations of various diseases. Identifying molecules that take part in the signaling activity of these receptors, and finding ways to modulate the function of these molecules, constitutes a potential clue for new therapeutical approaches to these diseases. In view of the suspected central role of MACHαl in FAS-R and TNF toxicity, it seems particularly important to design drugs that can block the proteolytic function of this molecule, as has been done for some other members of the CED3/ICE family. The unique sequence features of the CED3/ICE homolog encompassed in the MACHαl molecules may allow designing drugs that can affect its protection from excessive immune-mediated cytotoxicity without interfering with physiological cell death processes, in which other members of the CED3/ICE family are involved. Thus, the present invention also concerns the DNA sequence encoding a MORT-l-binding protein and the MORT-1- binding proteins encoded by the DNA sequences. Moreover, the present invention further concerns the DNA sequences encoding biologically active analogs, fragments and derivatives of the MORT-l-binding protein, and the analogs, fragments and derivatives encoded thereby. The preparation of such analogs, fragments and derivatives is by standard procedure (see for example, Sambrook et al. , 1989) in which in the DNA sequences encoding the MORT-l-binding protein, one or more codons may be deleted, added or substituted by another, to yield analogs having at least one amino acid residue change with respect to the native protein. A polypeptide or protein "substantially corresponding" to MORT-l-binding protein includes not only MORT-l-binding protein but also polypeptides or proteins that are analogs of MORT-l-binding. Analogs that subεtantially correspond to MORT-1- binding protein are those polypeptides in which one or more amino acid of the MORT-l-binding protein's amino acid sequence has been replaced with another amino acid, deleted and/or inserted, provided that the resulting protein exhibits substantially the same or higher biological activity as the MORT-l-binding protein to which it corresponds. In order to substantially correspond to MORT-l- binding protein, the changes in the sequence of MORT-l-binding proteins, such as MACH isoforms are generally relatively minor. Although the number of changes may be more than ten, preferably there are no more than ten changes, more preferably no more than five, and most preferably no more than three such changes. While any technique can be used to find potentially biologically active proteins which substantially correspond to MORT-l-binding proteins, one such technique is the use of conventional mutagenesis techniques on the DNA encoding the protein, resulting in a few modifications. The proteins expressed by such clones can then be screened for MORT-l binding and/or FAS-R and p55-R mediating activity. "Conservative" changes are those changes which would not be expected to change the activity of the protein and are usually the first to be screened as these would not be expected to substantially change the size, charge or configuration of the protein and thus would not be expected to change the biological properties thereof. Conservative substitutions of MORT-l-binding proteins include an analog wherein at least one amino acid residue in the polypeptide has been conservatively replaced by a different amino acid. Such substitutions preferably are made in accordance with the following list as presented in Table IA, which substitutions may be determined by routine experimentation to provide modified structural and functional properties of a synthesized polypeptide molecule while maintaining the biological activity characteristic of MORT-1- binding protein. Table IA Oriαinal Exemplary Residue Substitution Ala Gly;Ser Arg Lys Asn Gin;His Asp Glu Cys Ser Gin Asn Glu Asp Gly Ala;Pro His Asn;Gin He Leu;Val Leu He;Val Lys Arg;Gin;Glu Met Leu;Tyr;He Phe Met;Leu;Tyr Ser Thr Thr Ser Trp Tyr Tyr Trp;Phe Val He;Leu Alternatively, another group of substitutions of MORT-l-binding protein are those in which at least one amino acid residue in the polypeptide has been removed and a different residue inserted in its place according to the following Table IB. The types of substitutions which may be made in the polypeptide may be based on analysis of the frequencies of amino acid changes between a homologous protein of different species, such as those presented in Table 1-2 of Schulz et al. , G.E., Principles of Protein Structure Springer- Verlag, New York, NY, 1798, and Figs. 3-9 of Creighton, T. E. , Proteins: Structure and Molecular Properties, W.H. Freeman & Co., San Francisco, CA 1983. Based on such an analysis, alternative conservative substitutions are defined herein as exchanges within one of the following five groups: TABLE IB 1. Small aliphatic, nonpolar or slightly polar residues: Ala, Ser, Thr (Pro, Gly) ; 2. Polar negatively charged residues and their amides: Asp, Asn, Glu, Gin; 3. Polar, positively charged residues: His, Arg, Lys; 4. Large aliphatic nonpolar residues: Met, Leu, He, Val (Cys) ; and 5. Large aromatic residues: Phe, Tyr, Trp. The three amino acid residues in parentheses above have special roles in protein architecture. Gly is the only residue lacking any side chain and thus imparts flexibility to the chain. This however tends to promote the formation of secondary structure other than α-helical. Pro, because of its unusual geometry, tightly constrains the chain and generally tends to promote jS-turn-like structures, although in some cases Cys can be capable of participating in disulfide bond formation which is important in protein folding. Note that Schulz et al . , supra, would merge Groups 1 and 2, above. Note also that Tyr, because of its hydrogen bonding potential, has significant kinship with Ser, and Thr, etc. Conservative amino acid substitutions according to the present invention, e.g., as presented above, are known in the art and would be expected to maintain biological and structural properties of the polypeptide after amino acid substitution. Most deletions and substitutions according to the present invention are those which do not produce radical changes in the characteristics of the protein or polypeptide molecule. "Characteristics" is defined in a non-inclusive manner to define both changes in secondary structure, e.g. α- helix or jS-sheet, as well as changes in biological activity, e.g., binding of MORT-l or mediation of FAS-R ligand or TNF effect on cells. Examples of production of amino acid substitutions in proteins which can be used for obtaining analogs of MORT-1- binding proteins for use in the present invention include any known method steps, such as presented in U.S. patent RE 33,653, 4,959,314, 4,588,585 and 4,737,462, to Mark et al. ; 5,116,943 to Koths et al. , 4,965,195 to Namen et al. ; 4,879,111 to Chong et al . ; and 5,017,691 to Lee et al . ; and lysine substituted proteins presented in U.S. patent No. 4,904,584 (Shaw et al. ) . Besides conservative substitutions discussed above which would not significantly change the activity of MORT-1- binding protein, either conservative substitutions or less conservative and more random changes, which lead to an increase in biological activity of the analogs of MORT-1- binding proteins, are intended to be within the scope of the invention. When the exact effect of the substitution or deletion is to be confirmed, one skilled in the art will appreciate that the effect of the substitution(s) , deletion(s), etc., will be evaluated by routine binding and cell death assays. Screening using such a standard test does not involve undue experimentation. Acceptable analogs are those which retain at least the capability of binding to MORT-l, and thereby, as noted above mediate the activity (e.g., by the protease activity of at least some of the MACH isoforms) of the FAS-R and p55-R. In such a way, analogs can be produced which have a so-called dominant-negative effect, namely, an analog which is defective either in binding to MORT-l, or in subsequent signaling or protease activity following such binding. Such analogs can be used, for example, to inhibit the FAS-ligand- effect by competing with the natural MORT-l-binding proteins. For example, it appears likely that the MACH isoforms, MACHα2 and MACHα3 are "natural" analogs which serve to inhibit MACH activity by competing with the binding of the active (protease) MACH isoforms to MORT-l which appears to be essential for the activation of these MACH isoforms. Once the active MACH isoforms cannot bind to MORT-l, the intracellular signaling pathways mediated by FAS-R and p55-R will thereby also be inhibited. Likewise, so-called dominant-positive analogs may be produced which would serve to enhance the FAS ligand or TNF effect. These would have the same or better MORT-l-binding properties and the same or better signaling properties of the natural MORT-l-binding proteins. At the genetic level, these analogs are generally prepared by site-directed mutagenesis of nucleotides in the DNA encoding the MORT-l-binding protein, thereby producing DNA encoding the analog, and thereafter synthesizing the DNA and expressing the polypeptide in recombinant cell culture. The analogs typically exhibit the same or increased qualitative biological activity as the naturally occurring protein, Ausubel et al . , Current Protocols in Molecular Biology, Greene Publications and Wiley Interscience, New York, NY, 1987-1995; Sambrook et al . , Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, 1989. Preparation of a MORT-l-binding protein in accordance herewith, or an alternative nucleotide sequence encoding the same polypeptide but differing from the natural sequence due to changes permitted by the known degeneracy of the genetic code, can be achieved by site-specific mutagenesis of DNA that encodes an earlier prepared analog or a native version of a MORT-l-binding protein. Site-specific mutagenesis allows the production of analogs through the use of specific oligonucleotide sequences that encode the DNA sequence of the desired mutation, as well as a sufficient number of adjacent nucleotides, to provide a primer sequence of sufficient size and sequence complexity to form a stable duplex on both sides of the deletion junction being traversed. Typically, a primer of about 20 to 25 nucleotides in length is preferred, with about 5 to 10 complementing nucleotides on each side of the sequence being altered. In general, the technique of site-specific mutagenesis is well known in the art, as exemplified by publications such as Adelman et al . , DNA =183 (1983) , the disclosure of which is incorporated herein by reference. As will be appreciated, the site-specific mutagenesis technique typically employs a phage vector that exists in both a single-stranded and double-stranded form. Typical vectors useful in site-directed mutagenesis include vectors such as the M13 phage, for example, as disclosed by Messing et al . , Third Cleveland Symposium on Macromolecules and Recombinant DNA, Editor A. Walton, Elsevier, Amsterdam (1981) , the disclosure of which is incorporated herein by reference. These phage are readily available commercially and their use is generally well known to those skilled in the art. Alternatively, plasmid vectors that contain a single-stranded phage origin of replication (Veira et al . , Meth . Enzymol . 153.:3, 1987) may be employed to obtain single-stranded DNA. In general, site-directed mutagenesis in accordance herewith is performed by first obtaining a single-stranded vector that includes within its sequence a DNA sequence that encodes the relevant polypeptide. An oligonucleotide primer bearing the desired mutated sequence is prepared synthetically by automated DNA/oligonucleotide synthesis. This primer is then annealed with the single-stranded protein-sequence- containing vector, and subjected to DNA-polyrnerizing enzymes such as E. coli polymerase I Klenow fragment, to complete the synthesis of the mutation-bearing strand. Thus, a mutated sequence and the second strand bears the desired mutation. This heteroduplex vector is then used to transform appropriate cells, such as E. coli JM101 cells, and clones are selected that include recombinant vectors bearing the mutated sequence arrangement. After such a clone is selected, the mutated MORT-1- binding protein may be removed and placed in an appropriate vector, generally a transfer or expression vector of the type that may be employed for transfection of an appropriate host. Accordingly, gene or nucleic acid encoding for a MORT-l-binding protein can also be detected, obtained and/or modified, in vi tro, in si tu and/or in vivo, by the use of known DNA or RNA amplification techniques, such as PCR and chemical oligonucleotide synthesis. PCR allows for the amplification (increase in number) of specific DNA sequences by repeated DNA polymerase reactions. This reaction can be used as a replacement for cloning; all that is required is a knowledge of the nucleic acid sequence. In order to carry out PCR, primers are designed which are complementary to the sequence of interest . The primers are then generated by automated DNA synthesis. Because primers can be designed to hybridize to any part of the gene, conditions can be created such that mismatches in complementary base pairing can be tolerated. Amplification of these mismatched regions can lead to the synthesis of a mutagenized product resulting in the generation of a peptide with new properties (i.e., site directed mutagenesis) . See also, e.g., Ausubel, supra, Ch. 16. Also, by coupling complementary DNA (cDNA) synthesis, using reverse transcriptase, with PCR, RNA can be used as the starting material for the synthesis of the extracellular domain of a prolactin receptor without cloning. Furthermore, PCR primers can be designed to incorporate new restriction sites or other features such as termination codons at the ends of the gene segment to be amplified. This placement of restriction sites at the 5' and 3 ' ends of the amplified gene sequence allows for gene segments encoding MORT-l-binding protein or a fragment thereof to be custom designed for ligation other sequences and/or cloning sites in vectors. PCR and other methods of amplification of RNA and/or DNA are well known in the art and can be used according to the present invention without undue experimentation, based on the teaching and guidance presented herein. Known methods of DNA or RNA amplification include, but are not limited to polymerase chain reaction (PCR) and related amplification processes (see, e.g., U.S. patent Nos. 4,683,195, 4,683,202, 4,800,159, 4,965,188, to Mullis et al . ; 4,795,699 and 4,921,794 to Tabor et al . ; 5,142,033 to Innis; 5,122,464 to Wilson et al . ; 5,091,310 to Innis; 5,066,584 to Gyllensten et al . ; 4,889,818 to Gelfand et al . ; 4,994,370 to Silver et al . ; 4,766,067 to Biswas; 4,656,134 to Ringold; and Innis et al. , eds., PCR Protocolε : A Guide to Method and Applications) and RNA mediated amplification which uses anti-sense RNA to the target sequence as a template for double stranded DNA synthesis (U.S. patent No. 5,130,238 to Malek et al . , with the tradename NASBA) ; and immuno-PCR which combines the use of DNA amplification with antibody labeling (Ruzicka et al . , Science 26 :487 (1993) ; Sano et al . , Science 258_ : 120 (1992) ; Sano et al . , Biotechniques S»:1378 (1991)), the entire contents of which patents and reference are entirely incorporated herein by reference. In an analogous fashion, biologically active fragments of MORT-l-binding proteins (e.g., those of any of the MACH isoforms) may be prepared as noted above with respect to the analogs of MORT-l-binding proteins. Suitable fragments of MORT-l-binding proteins are those which retain the MORT-l binding capability and which can mediate the biological activity of FAS-R and p55-R as noted above. Accordingly, MORT-l-binding protein fragments can be prepared which have a dominant-negative or a dominant-positive effect as noted above with respect to the analogs. It should be noted that these fragments represent a special class of the analogs of the invention, namely, they are defined portions of MORT-l-binding proteins derived from the full MORT-l-binding protein sequence (e.g., from that of any one of the MACH isoforms) , each such portion or fragment having any of the above-noted desired activities. Such fragment may be, e.g., a peptide. Similarly, derivatives may be prepared by standard modifications of the side groups of one or more amino acid residues of the MORT-l-binding protein, its analogs or fragments, or by conjugation of the MORT-l-binding protein, its analogs or fragments, to another molecule e.g. an antibody, enzyme, receptor, etc., as are well known in the art. Accordingly, "derivatives" as used herein covers derivatives which may be prepared from the functional groups which occur as side chains on the residues or the N- or C- terminal groups, by means known in the art, and are included in the invention. Derivatives may have chemical moieties such as carbohydrate or phosphate residues, provided such a fraction has the same or higher biological activity as M0RT-1- binding proteins. For example, derivatives may include aliphatic esters of the carboxyl groupε, amides of the carboxyl groups by reaction with ammonia or with primary or secondary amines, N-acyl derivatives or free amino groups of the amino acid residues formed with acyl moieties (e.g., alkanoyl or carbocyclic aroyl groups) or O-acyl derivatives of free hydroxyl group (for example that of seryl or threonyl residues) formed with acyl moieties. The term "derivatives" is intended to include only those derivatives that do not change one amino acid to another of the twenty commonly occurring natural amino acids. Although MORT-l-binding protein is a protein or polypeptide, it is a sequence of amino acid residues. A polypeptide consisting of a larger sequence which includes the entire sequence of a MORT-l-binding protein, in accordance with the definitions herein, is intended to be included within the scope of such a polypeptide as long as the additions do not affect the basic and novel characteristics of the invention, i.e., if they either retain or increase the biological activity of MORT-l-binding protein or can be cleaved to leave a protein or polypeptide having the biological activity of MORT-l-binding protein. Thus, for example, the present invention is intended to include fusion proteins of MORT-l-binding protein with other amino acids or peptideε. The new MORT-l-binding protein, their analogε, fragments and derivatives thereof, have a number of uses, for example: (i) MORT-l-binding protein, its analogs, fragments and derivatives thereof, may be used to mimic or enhance the function of MORT-l and hence the FAS-R ligand or TNF, in situations where an enhanced FAS-R ligand or TNF effect is desired, such as in anti-tumor, anti-inflammatory, anti-HIV applications, etc., where the FAS-R ligand- or TNF-induced cytotoxicity is desired. In this case the MORT-l-binding protein, its analogs, fragments or derivatives thereof, which enhance the FAS-R ligand of TNF effect, i.e., cytotoxic effect, may be introduced to the cells by standard procedures known per se . For example, as the MORT-l-binding protein are intracellular and should be introduced only into the ' cells where the FAS-R ligand or TNF effect is desired, a system for specific introduction of this protein into the cells is necessary. One way of doing this is by creating a recombinant animal virus, e.g., one derived from Vaccinia, to the DNA of which the following two genes will be introduced: the gene encoding a ligand that binds to cell surface proteins specifically expressed by the cells, e.g., ones such as the AIDs (HIV) virus gpl20 protein which binds specifically to some cells (CD4 lymphocytes and related leukemias) , or any other ligand that binds specifically to cells carrying a FAS-R or p55-R, such that the recombinant viruε vector will be capable of binding such FAS-R- or p55-R -carrying cells; and the gene encoding the MORT-l-binding protein. Thus, expression of the cell-surface-binding protein on the surface of the virus will target the virus εpecifically to the tumor cell or other FAS-R- or p55-R- carrying cell, following which the MORT-l-binding protein encoding sequence will be introduced into the cells via the virus, and once expressed in the cells, will result in enhancement of the FAS-R ligand or TNF effect leading to the death of the tumor cells or other FAS-R- or p55-R -carrying cells it is desired to kill. Construction of such recombinant animal virus is by standard procedures (see for example, Sambrook et al . , 1989) . Another posεibility iε to introduce the sequenceε of the MORT-1- binding protein (e.g., any one of the MACH isoformε) in the form of oligonucleotides which can be absorbed by the cells and expresεed therein. (ii) They may be used to inhibit the FAS-R ligand or TNF effect, e.g., in cases such as tissue damage in septic shock, graft-vs. -host rejection, or acute hepatitis, in which it is desired to block the FAS-R ligand or TNF induced FAS-R or p55-R intracellular signaling. In this situation, it is posεible, for example, to introduce into the cellε, by standard procedures, oligonucleotides having the anti-sense coding sequence for the MORT-l-binding protein, which would effectively block the translation of mRNAs encoding either the MORT-l protein or the MORT-l-binding protein and thereby block its expreεεion and lead to the inhibition of the FAS-R ligand- or TNF- effect. Such oligonucleotideε may be introduced into the cells using the above recombinant viruε approach, the second sequence carried by the virus being the oligonucleotide sequence. Another posεibility iε to uεe antibodieε specific for the MORT-l-binding protein to inhibit itε intracellular εignaling activity. Yet another way of inhibiting the FAS-R ligand or TNF effect is by the recently developed ribozyme approach. Ribozymes are catalytic RNA molecules that specifically cleave RNAs. Ribozymes may be engineered to cleave target RNAs of choice, e.g., the mRNAs encoding the MORT-l-binding protein of the invention. Such ribozymeε would have a εequence εpecific for the MORT-l-binding protein mRNA and would be capable of interacting therewith (complementary binding) followed by cleavage of the mRNA, resulting in a decrease (or complete loss) in the expresεion of the MORT-l-binding protein, the level of decreaεed expression being dependent upon the level of ribozyme expression in the target cell. To introduce ribozymes into the cells of choice (e.g., those carrying FAS-R or p55-R) , any εuitable vector may be used, e.g., plasmid, animal viruε (retroviruε) vectors, that are usually used for this purpose (see also (i) above, where the virus has, as second sequence, a cDNA encoding the ribozyme sequence of choice) . (For reviews, methods etc. concerning ribozymes see Chen et al., 1992; Zhao and Pick, 1993; Shore et al. , 1993; Joεeph and Burke, 1993; Shimayama et al. , 1993; Cantor et al. , 1993; Barinaga, 1993; Crisell et al. , 1993 and Koizumi et al. , 1993) . (iii) The MORT-l-binding protein, its analogs, fragments or derivatives may also be used to iεolate, identify and clone other proteinε of the same class, i.e., those binding to FAS-R intracellular domain or to functionally related receptors, or those binding to MORT-l and thereby to functionally related receptors εuch aε FAS-R and p55-R, and involved in the intracellular εignaling process. In this application the above noted yeast two-hybrid syεtem may be uεed, or there may be uεed a recently developed εyεtem employing non-stringent Southern hybridization followed by PCR cloning (Wilks et al . , 1989) . In the Wilks et al. publication, there is described the identification and cloning of two putative protein-tyrosine kinases by application of non-stringent southern hybridization followed by cloning by PCR baεed on the known sequence of the kinase motif, a conceived kinase sequence. This approach may be used, in accordance with the present invention using the sequence of the MORT-l-binding protein (e.g., any of the MACH isoforms) to identify and clone those of related MORT-l-binding proteinε. (iv) Yet another approach to utilizing the MORT-1- binding protein, or its analogε, fragments or derivativeε thereof, of the invention is to use them in methods of affinity chromatography to isolate and identify other proteins or factorε to which they are capable of binding, e.g., MORT-l, or other proteins or factors involved in the intracellular signaling process. In this application, the MORT-l-binding protein, its analogs, fragments or derivatives thereof, of the present invention, may be individually attached to affinity chromatography matrices and then brought into contact with cell extracts or isolated proteins or factors suspected of being involved in the intracellular signaling process. Following the affinity chromatography procedure, the other proteins or factors which bind to the MORT-l-binding protein, or itε analogs, fragments or derivativeε thereof of the invention, can be eluted, iεolated and characterized. (v) Aε noted above, the MORT-l-binding protein, or its analogε, fragmentε or derivatives thereof, of the invention may also be uεed aε immunogens (antigens) to produce specific antibodies thereto. These antibodies may alεo be used for the purposes of purification of the MORT-l-binding protein (e.g., MACH isoformε) either from cell extractε or from tranεformed cell lines producing MORT-l-binding protein, or its analogs or fragmentε. Further, these antibodies may be used for diagnostic purposeε for identifying diεorderε related to abnormal functioning of the FAS-R ligand or TNF εyεtem, e.g., overactive or underactive FAS-R ligand- or TNF- induced cellular effectε. Thuε, εhould εuch diεorderε be related to a malfunctioning intracellular εignaling εystem involving the MORT-l protein, or MORT-l-binding protein, such antibodies would serve as an important diagnostic tool. It should also be noted that the isolation, identification and characterization of the MORT-l-binding protein (e.g., the MACH isoforms) of the invention may be performed using any of the well known standard screening procedures. For example, one of these screening procedures, the yeast two-hybrid procedure as is set forth herein (Example 1) , was used to identify the MORT-l protein and subsequently the MORT-l-binding proteins (Examples 2-3) of the invention. Likewise as noted above and below, other procedures may be employed such as affinity chromatography, DNA hybridization procedures, etc. as are well known in the art, to isolate, identify and characterize MORT-l-binding protein of the invention or to isolate, identify and characterize additional proteins, factors, receptors, etc. which are capable of binding to the MORT-l protein or to the MORT-l-binding proteins of the invention. Aε set forth hereinabove, the MORT-l-binding protein may be used to generate antibodies specific tc MORT-l-binding proteins, e.g., MACH isoforms. These antibodies or fragments thereof may be used as set forth hereinbelow in detail, it being understood that in these applications the antibodies or fragments thereof are those specific for MORT-l-binding proteins. Based on the findings in accordance with the present invention that at least some of the MACH isoforms (see above and Example 3 below) are proteases related to the proteases of the CED3/ICE family of proteaseε, the following specific medical applications are enviεioned for these MACH iεoformε: it has been found that εpecific inhibitorε of other CED3/ICE proteaεes, some of which are cell permeable, already exist, which can block effectively programmed cell death processes. Hence, it is posεible in accordance with the present invention to design inhibitorε that can prevent FAS-R ligand- or TNF- induced cell death, the pathwayε in which the MACH protease isoforms are involved. Further, in view of the unique sequence features of these new MACH proteases, it seems possible to design inhibitors that will be highly specific to the TNF- and FAS-R ligand-induced effects. The findings of the present invention also provide a way to study the mechaniεm in which the "killing protease" is activated in responεe to FAS-R ligand and TNF, thiε allowing subsequent development of drugs that can control the extent of this activation. There are many diseases in which such drugs can be of great help. Amongst others, acute hepatitis in which the acute damage to the liver seems to reflect FAS-R ligand- mediated death of the liver cells; autoimmune-induced cell death such as the death of the β Langerhans cells of the pancreas, that results in diabetes; the death of cells in graft rejection (e.g., kidney, heart and liver) ; the death of oligodendrocytes in the brain in multiple scleroεis; and AIDS- inhibited T cell suicide which causes proliferation of the AIDS virus and hence the AIDS disease. As mentioned hereinabove and hereinbelow, it appears that two of the MACH isoforms, MACHα2 and MACHα3 may serve aε "natural" inhibitorε of the MACH proteaεe isoforms, and these may thus be employed as the above noted specific inhibitors of these MACH proteases. Likewise, other subεtanceε such as peptides, organic compounds, antibodies, etc. may also be screened to obtain specific drugs which are capable of inhibiting the MACH proteases. A non-limiting example of how peptide inhibitors of the MACH proteaεeε would be deεigned and screened iε based on previous studies on peptide inhibitors of ICE or ICE-like proteaseε, the εubstrate specificity of ICE and strategies for epitope analysis using peptide synthesiε. The minimum requirement for efficient cleavage of peptide by ICE was found to involve four amino acidε to the left of the cleavage site with a strong preference for aspartic acid in the P, position and with methylamine being sufficient to the right of the P, position (Sleath et al . , 1990; Howard et al. , 1991; Thornberry et al., 1992) . Furthermore, the fluorogenic substrate peptide (a tetrapeptide) , acetyl-Asp-Glu-Val-Asp-a- (4-methyl-coumaryl- 7-amide) abbreviated Ac-DEVD-AMC, corresponds to a sequence in poly (ADP-ribose) polymerase (PARP) found to be cleaved in cells shortly after FAS-R stimulation, as well as other apoptopic processes (Kaufmann, 1989; Kaufmann et al. , 1993; Lazebnik et al., 1994) , and is cleaved effectively by CPP32 (a member of the CED3/ICE protease family) and MACH proteases. Aε Aεp in the P- position of the substrate appears to be important, tetrapeptides having Aεp as the fourth amino acid residue and various combinations of amino acids in the first three residue positions can be rapidly screened for binding to the active site of MACH proteases using, for example, the method developed by Geysen (Geysen, 1985; Geysen et al. , 1987) where a large number of peptides on solid supportε were εcreened for εpecific interactions with antibodies. The binding of MACH proteases to specific peptides can be detected by a variety of well known detection methods within the εkill of those in the art, such as radiolabeling of the MACH protease, etc. This method of Geysen' ε was shown to be capable of testing at least 4000 peptides each working day. Since it may be advantageous to design peptide inhibitors that selectively inhibit MACH proteases without interfering with physiological cell death processes in which other members of the CED3/ICE family of proteases are involved, the pool of peptides binding to MACH proteases in an assay such as the one described above can be further syntheεized aε a fluorogenic substrate peptide to test for εelective cleavage by MACH proteaεeε without being cleaved by other CED3/ICE proteaεeε. Peptideε which are determined to be selectively cleaved by the MACH proteases, can then be modified to enhance cell permeability and inhibit the cell death activity of MACH either reversibly or irreversibly. Thornberry et al. (1994) reported that a tetrapeptide (acyloxy) methyl ketone Ac-Tyr-Val-Ala-Asp-CH 2 OC(0) - [2, 6- (CF 3 ) 2 ]Ph waε a potent inactivator of ICE. Similarly, Milligan et al . (1995) reported that tetrapeptide inhibitorε having a chloromethylketone (irreverεibly) or aldehyde (reverεibly) groupε inhibited ICE. In addition, a benzyloxycarboxyl-Aεp- CH 2 OC(0) -2, 6-dichlorobenzene (DCB) waε εhown to inhibit ICE (Maεhima et al., 1995) . Accordingly, tetrapeptideε that selectively bind to MACH proteaseε can be modified with, for example, an aldehyde group, chloromethylketone, (acyloxy) methyl ketone or a CH 2 OC(0)-DCB group to create a peptide inhibitor of MACH proteaεe activity. While some specific inhibitors of other CED3/ICE proteaseε are cell permeable, the cell permeability of peptide inhibitorε may need to be enhanced. For instance, peptides can be chemically modified or derivatized to enhance their permeability across the cell membrane and facilitate the transport of such peptides through the membrane and into the cytoplasm. Muranishi et al. (1991) reported derivatizing thyrotropin-releasing hormone with lauric acid to form a lipophilic lauroyl derivative with good penetration characteristics across cell membranes. Zacharia et al . (1991) also reported the oxidation of methionine to sulfoxide and the replacement of the peptide bond with its ketomethylene isoester (C0CH 2 ) to facilitate transport of peptides through the cell membrane. These are just some of the known modifications and derivatives that are well within the skill of those in the art. Furthermore, drug or peptide inhibitors, which are capable of inhibiting the cell death activity of MACHαl and MACHα2, can be conjugated or complexed with molecules that facilitate entry into the cell. U.S. Patent 5,149,782 discloεes conjugating a molecule to be transported across the cell membrane with a membrane blending agent such aε fuεogenic polypeptideε, ion- channel forming polypeptideε, other membrane polypeptideε, and long chain fatty acids, e.g., myristic acid, palmitic acid. Theεe membranes blending agents insert the molecular conjugates into the lipid bilayer of cellular membranes and facilitate their entry into the cytoplasm. Low et al., U.S. Patent 5,108,921, reviews available methodε for tranεmembrane delivery of moleculeε εuch aε, but not limited to, proteinε and nucleic acids by the mechanism of receptor mediated endocytotic activity. These receptor systems include those recognizing galactose, mannose, mannose 6-phosphate, transferrin, asialoglycoprotein, tranεcobalamin (vitamin B π ) , α-2 macroglobulins, insulin and other peptide growth factors such as epidermal growth factor (EGF) . Low et al. teaches that nutrient receptors, such aε receptorε for biotin and folate, can be advantageouεly uεed to enhance transport acrosε the cell membrane due to the location and multiplicity of biotin and folate receptorε on the membrane surfaces of most cellε and the associated receptor mediated transmembrane transport processes. Thus, a complex formed between a compound to be delivered into the cytoplasm and a ligand, such as biotin or folate, is contacted with a cell membrane bearing biotin or folate receptors to initiate the receptor mediated tranε-membrane transport mechanism and thereby permit entry of the deεired compound into the cell. ICE is known to have the ability to tolerate liberal subεtitutions in the P 2 position and this tolerance to liberal substitutions was exploited to develop a potent and highly selective affinity label containing a biotin tag (Thornberry et al., 1994) . Consequently, the P 2 position aε well as possibly the N-terminus of the tetrapeptide inhibitor can be modified or derivatized, such as to with the addition of a biotin molecule, to enhance the permeability of these peptide inhibitors acrosε the cell membrane. In addition, it iε known in the art that fuεing a deεired peptide sequence with a leader/signal peptide sequence to create a "chimeric peptide" will enable such a "chimeric peptide" to be transported acrosε the cell membrane into the cytoplasm. As will be appreciated by thoεe of skill in the art of peptides, the peptide inhibitors of MACH proteolytic activity according to the present invention iε meant to include peptidomimetic drugs or inhibitors, which can also be rapidly screened for binding to MACH protease to design perhaps more stable inhibitors . It will alεo be appreciated that the same means for facilitating or enhancing the tranεport of peptide inhibitorε acroεε cell membranes as diεcuεsed above are also applicable to the MACH isoforms themselves as well as other peptides and proteins which exertε their effects intracellularly. As regards the antibodies mentioned herein throughout, the term "antibody" is meant to include polyclonal antibodies, monoclonal antibodies (mAbs) , chimeric antibodies, anti-idiotypic (anti-Id) antibodieε to antibodieε that can be labeled in soluble or bound form, as well as fragments thereof provided by any known technique, such as, but not limited to enzymatic cleavage, peptide synthesis or recombinant techniques. Polyclonal antibodies are heterogeneous populations of antibody molecules derived from the sera of animals immunized with an antigen. A monoclonal antibody contains a substantially homogeneous population of antibodies specific to antigens, which populations contains substantially similar epitope binding sites. MAbs may be obtained by methods known to those skilled in the art. See, for example Kohler and Milstein, Nature. 256:495-497 (1975); U.S. Patent No. 4,376,110; Ausubel et al . , eds., Harlow and Lane ANTIBODIES : A LABORATORY MANUAL, Cold Spring Harbor Laboratory (1988) ; and Colligan et al. , eds., Current Protocolε in Immunology, Greene Publishing Assoc. and Wiley Interεcience N.Y. , (1992-1996), the contents of which references are incorporated entirely herein by reference. Such antibodies may be of any immunoglobulin class including IgG, IgM, IgE, IgA, GILD and any subclass thereof. A hybridoma producing a mAb of the present invention may be cultivated in vi tro, in si tu or in vivo . Production of high titers of mAbs in vivo or in si tu makes this the presently preferred method of production. Chimeric antibodies are moleculeε of which different portions are derived from different animal species, such as those having the variable region derived from a murine mAb and a human immunoglobulin constant region. Chimeric antibodies are primarily used to reduce immunogenicity in application and to increase yields in production, for example, where murine mAbs have higher yields from hybridomas but higher immunogenicity in humans, such that human/murine chimeric mAbs are used. Chimeric antibodies and methods for their production are known in the art (Cabilly et al. , Proc. Natl . Acad. Sci . USA 81:3273-3277 (1984) ; Morrison et al . , Proc. Natl . Acad. Sci . USA 81:6851-6855 (1984) ; Boulianne et al. , Nature 312:643-646 (1984) ; Cabilly et al. , European Patent Application 125023 (publiεhed November 14, 1984) ; Neuberger et al., Nature 314:268-270 (1985) ; Taniguchi et al. , European Patent Application 171496 (published February 19, 1985) ; Morrison et al. , European Patent Application 173494 (published March 5, 1986); Neuberger et al., PCT Application WO 8601533, (published March 13, 1986) ; Kudo et al . , European Patent Application 184187 (published June 11, 1986); Sahagan et al., J. Immunol . 137:1066-1074 (1986); Robinson et al. , International Patent Application No. WO8702671 (publiεhed May 7, 1987) ; Liu et al. , Proc. Natl . Acad. Sci USA 84:3439-3443 (1987) ; Sun et al., Proc . Natl . Acad. Sci USA 84:214-218 (1987) ; Better et al. , Science 240:1041-1043 (1988); and Harlow and Lane, ANTIBODIES:A LABORATORY MANUAL, supra. These references are entirely incorporated herein by reference. An anti-idiotypic (anti-Id) antibody is an antibody which recognizes unique determinants generally asεociated with the antigen-binding εite of an antibody. An Id antibody can be prepared by immunizing an animal of the εame εpecieε and genetic type (e.g. mouse strain) as the source of the mAb to which an anti-Id iε being prepared. The immunized animal will recognize and respond to the idiotypic determinants of the immunizing antibody by producing an antibody to these idiotypic determinants (the anti-Id antibody) . See, for example, U.S. Patent No. 4,699,880, which iε herein entirely incorporated by reference. The anti-Id antibody may alεo be used as an "immunogen" to induce an immune responεe in yet another animal, producing a so-called anti-anti-ld antibody. The anti-anti-ld may be epitopically identical to the original mAb which induced the anti-Id. Thus, by using antibodieε to the idiotypic determinantε of a mAb, it is possible to identify other clones expressing antibodies of identical specificity. Accordingly, mAbs generated against the M0RT-1- binding proteins, analogs, fragments or derivatives thereof, of the present invention may be uεed to induce anti-Id antibodieε in εuitable animalε, εuch aε BALB/c mice. Spleen cells from such immunized mice are uεed to produce anti-Id hybridomas secreting anti-Id mAbε. Further, the anti-Id mAbε can be coupled to a carrier such as keyhole limpet hemocyanin (KLH) and used to immunize additional BALB/c mice. Sera from theεe mice will contain anti-anti-ld antibodies that have the binding properties of the original mAb specific for an epitope of the above MORT-l-binding protein, or analogs, fragments and derivatives thereof. The anti-Id mAbs thus have their own idiotypic epitopes, or "idiotopes" structurally similar to the epitope being evaluated, such as GRB protein-a. The term "antibody" is also meant to include both intact molecules as well as fragments thereof, such as, for example, Fab and F(ab')2, which are capable of binding antigen. Fab and F(ab')2 fragments lack the Fc fragment of intact antibody, clear more rapidly from the circulation, and may have less non-specific tissue binding than an intact antibody (Wahl et al . , J " . Nucl . Med. 24:316-325 (1983)) . It will be appreciated that Fab and F(ab')2 and other fragments of the antibodies useful in the preεent invention may be used for the detection and quantitation of the MORT-l-binding protein according to the methods discloεed herein for intact antibody molecules. Such fragments are typically produced by proteolytic cleavage, using enzymes such as papain (to produce Fab fragments) or pepsin (to produce F(ab')2 fragments) . An antibody is said to be "capable of binding" a molecule if it is capable of specifically reacting with the molecule to thereby bind the molecule to the antibody. The term "epitope" is meant to refer to that portion of any molecule capable of being bound by an antibody which can also be recognized by that antibody. Epitopeε or "antigenic determinantε" usually consist of chemically active surface groupings of molecules εuch aε amino acidε or εugar εide chainε and have specific three dimensional εtructural characteriεtics as well as εpecific charge characteristics. An "antigen" is a molecule or a portion of a molecule capable of being bound by an antibody which iε additionally capable of inducing an animal to produce antibody capable of binding to an epitope of that antigen. An antigen may have one or more than one epitope. The specific reaction referred to above iε meant to indicate that the antigen will react, in a highly selective manner, with itε corresponding antibody and not with the multitude of other antibodies which may be evoked by other antigens. The antibodies, including fragments of antibodies, useful in the present invention may be uεed to quantitatively or qualitatively detect the MORT-l-binding protein in a sample or to detect presence of cells which express the MORT-1- binding protein of the present invention. This can be accomplished by immunofluoreεcence techniques employing a fluorescently labeled antibody (see below) coupled with light microscopic, flow cytometric, or fluorometric detection. The antibodies (or fragments thereof) useful in the present invention may be employed histologically, as in immunofluoreεcence or immunoelectron microεcopy, for in si tu detection of the MORT-l-binding protein of the present invention. In si tu detection may be accomplished by removing a histological specimen from a patient, and providing the labeled antibody of the present invention to such a specimen. The antibody (or fragment) iε preferably provided by applying or by overlaying the labeled antibody (or fragment) to a biological sample. Through the use of such a procedure, it iε possible to determine not only the presence of the MORT-1- binding protein, but alεo itε diεtribution on the examined tiεεue. Uεing the preεent invention, those of ordinary skill will readily perceive that any of wide variety of histological methods (such aε εtaining procedureε) can be modified in order to achieve εuch in si tu detection. Such aεεayε for the MORT-l-binding protein of the preεent invention typically comprises incubating a biological sample, εuch aε a biological fluid, a tiεεue extract, freεhly harveεted cellε εuch aε lymphocytes or leukocytes, or cellε which have been incubated in tissue culture, in the presence of a detectably labeled antibody capable of identifying the MORT-l-binding protein, and detecting the antibody by any of a number of techniques well known in the art. The biological sample may be treated with a solid phase support or carrier such as nitrocellulose, or other εolid support or carrier which is capable of immobilizing cells, cell particles or soluble proteins. The support or carrier may then be washed with suitable bufferε followed by treatment with a detectably labeled antibody in accordance with the preεent invention, as noted above. The solid phase εupport or carrier may then be washed with the buffer a second time to remove unbound antibody. The amount of bound label on said solid support or carrier may then be detected by conventional means. By "solid phase support", "solid phase carrier", "solid support", "solid carrier", "support" or "carrier" is intended any support or carrier capable of binding antigen or antibodies. Well-known supports or carriers, include glass, polystyrene, polypropylene, polyethylene, dextran, nylon amylases, natural and modified celluloses, polyacrylamides, gabbros and magnetite. The nature of the carrier can be either soluble to some extent or insoluble for the purposeε of the preεent invention. The support material may have virtually any possible structural configuration so long as the coupled molecule is capable of binding to an antigen or antibody. Thus, the support or carrier configuration may be spherical, as in a bead, cylindrical, as in the inside surface of a test tube, or the external surface of a rod. Alternatively, the surface may be flat such as a sheet, test strip, etc. Preferred supportε or carrierε include polyεtyrene beads. Those εkilled in the art will know may other εuitable carriers for binding antibody or antigen, or will be able to ascertain the same by uεe of routine experimentation. The binding activity of a given lot of antibody, of the invention as noted above, may be determined according to well known methods. Those skilled in the art will be able to determine operative and optimal asεay conditionε for each determination by employing routine experimentation. Other such steps as washing, stirring, shaking, filtering and the like may be added to the assays as is customary or necessary for the particular situation. One of the ways in which an antibody in accordance with the present invention can be detectably labeled is by linking the same to an enzyme and used in an enzyme immunoassay (EIA) . This enzyme, in turn, when later exposed to an appropriate substrate, will react with the subεtrate in such a manner as to produce a chemical moiety which can be detected, for example, by spectrophotometric, fluorometric or by visual means . Enzymes which can be used to detectably label the antibody include, but are not limited to, malate dehydrogenase, εtaphylococcal nuclease, delta-5-steroid isomeras, yeast alcohol dehydrogenase, alpha-glycerophosphate dehydrogenaεe, trioεe phoεphate isomerase, horseradish peroxidase, alkaline phosphatase, asparaginase, glucose oxidase, beta-galactosidase, ribonuclease, urease, catalase, glucose-6-phoεphate dehydrogenase, glucoamylase and acetylcholin-eεteraεe. The detection can be accompliεhed by colorimetric methodε which employ a chromogenic εubεtrate for the enzyme. Detection may also be accomplished by viεual comparison of the extent of enzymatic reaction of a subεtrate in comparison with similarly prepared standards. Detection may be accomplished using any of a variety of other immunoassayε . For example, by radioactive labeling the antibodies or antibody fragments, it iε poεεible to detect R-PTPase through the use of a radioimmunoassay (RIA) . A good description of RIA may be found in Laboratory Techniques and Biochemiεtry in Molecular Biology, by Work, T.S. et al . , North Holland Publishing Company, NY (1978) with particular reference to the chapter entitled "An Introduction to Radioimmune Aεεay and Related Techniqueε" by Chard, T., incorporated by reference herein. The radioactive iεotope can be detected by εuch meanε aε the uεe of a g counter or a scintillation counter or by autoradiography. It is also posεible to label an antibody in accordance with the present invention with a fluorescent compound. When the fluorescently labeled antibody is exposed to light of the proper wavelength, its presence can be then detected due to fluorescence . Among the most commonly uεed fluorescent labeling compounds are fluorescein isothiocyanate, rhodamine, phycoerythrine, pycocyanin, allophycocyanin, o- phthaldehyde and fluorescamine. The antibody can alεo be detectably labeled using fluorescence emitting metals εuch aε 152 E, or otherε of the lanthanide εerieε. These metals can be attached to the antibody using such metal chelating groups as diethylenetriamine pentaacetic acid (ETPA) . The antibody can also be detectably labeled by coupling it to a chemiluminescent compound. The presence of the chemiluminescent-tagged antibody is then determined by detecting the presence of luminescence that arises during the course of a chemical reaction. Examples of particularly useful chemiluminescent labeling compounds are luminol, isoluminol, theromatic acridinium eεter, imidazole, acridinium salt and oxalate ester. Likewise, a bioluminescent compound may be used to label the antibody of the present invention. Bioluminescence is a type of chemiluminescence found in biological systems in which a catalytic protein increaseε the efficiency of the chemiluminescent reaction. The presence of a bioluminescent protein is determined by detecting the presence of luminescence. Important bioluminescent compounds for purposes of labeling are luciferin, luciferase and aequorin. An antibody molecule of the present invention may be adapted for utilization in an immunometric assay, also known as a "two-site" or "sandwich" assay. In a typical immunometric assay, a quantity of uniabeled antibody (or fragment of antibody) iε bound to a solid support or carrier and a quantity of detectably labeled soluble antibody is added to permit detection and/or quantitation of the ternary complex formed between solid-phase antibody, antigen, and labeled antibody. Typical, and preferred, immunometric assays include "forward" assayε in which the antibody bound to the εolid phase is first contacted with the sample being tested to extract the antigen from the sample by formation of a binary solid phase antibody-antigen complex. After a suitable incubation period, the solid support or carrier is washed to remove the residue of the fluid sample, including unreacted antigen, if any, and then contacted with the εolution containing an unknown quantity of labeled antibody (which functionε aε a "reporter molecule") . After a εecond incubation period to permit the labeled antibody to complex with the antigen bound to the solid εupport or carrier through the uniabeled antibody, the solid support or carrier is washed a second time to remove the unreacted labeled antibody. In another type of "sandwich" assay, which may also be useful with the antigens of the present invention, the so- called 'Simultaneous" and "reverse" assays are used. A simultaneous asεay involveε a εingle incubation εtep aε the antibody bound to the solid support or carrier and labeled antibody are both added to the sample being teεted at the same time. After the incubation is completed, the εolid support or carrier is waεhed to remove the reεidue of fluid εample and uncomplexed labeled antibody. The presence of labeled antibody asεociated with the solid support or carrier iε then determined as it would be in a conventional "forward" sandwich aεεay. In the "reverεe" assay, εtepwiεe addition first of a solution of labeled antibody to the fluid sample followed by the addition of uniabeled antibody bound to a εolid εupport or carrier after a suitable incubation period is utilized. After a second incubation, the solid phase is washed in conventional fashion to free it of the residue of the sample being tested and the solution of unreacted labeled antibody. The determination of labeled antibody associated with a solid support or carrier is then determined as in the "simultaneous" and "forward" assays. The MORT-l-binding proteins of the invention may be produced by any standard recombinant DNA procedure (see for example, Sambrook, et al. , 1989 and Ansabel et al. , 1987-1995, supra) in which suitable eukaryotic or prokaryotic host cells well known in the art are transformed by appropriate eukaryotic or prokaryotic vectors containing the sequences encoding for the proteins. Accordingly, the present invention also concerns such expression vectors and tranεformed hoεtε for the production of the proteinε of the invention. As mentioned above, these proteins also include their biologically active analogs, fragments and derivatives, and thuε the vectorε encoding them alεo include vectors encoding analogs and fragments of these proteins, and the tranεformed hosts include those producing such analogs and fragments. The derivatives of these proteins, produced by the transformed hosts, are the derivatives produced by standard modification of the proteins or their analogs or fragments. The present invention also relates to pharmaceutical compositions comprising recombinant animal virus vectors encoding the MORT-l-binding proteins, which vector also encodes a virus surface protein capable of binding specific target cell (e.g., cancer cells) surface proteins to direct the insertion of the MORT-l-binding protein sequences into the cells. Further pharmaceutical compositions of the invention comprises as the active ingredient (a) an oligonucleotide sequence encoding an anti-sense sequence of the MORT-l-binding protein sequence, or (b) drugs that block the proteolytic activity of MACH isoformε. Pharmaceutical compoεitions according to the present invention include a sufficient amount of the active ingredient to achieve its intended purpose. In addition, the pharmaceutical compositions may contain suitable pharmaceutically acceptable carrierε comprising excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used pharmaceutically and which can εtabilize εuch preparationε for administration to the subject in need thereof as well known to thoεe of εkill in the art. The MORT-l binding protein MACH, iε expreεsed in different tissues at markedly different levels and apparently also with different patterns of isotypes. Theεe differenceε probably contribute to the tissue-specific features of response to the Fas/APOl-ligand and TNF. As in the case of other CED3/ICE homologs (Wang et al. , 1994; Alnemri et al. , 1995) , MACH isoforms that contain incomplete CED3/ICE regions (e.g., MACHα3) are found to have an inhibitory effect on the activity of co-expresεed MACHαl or MACHα2 moleculeε; they are alεo found to block death induction by Fas/APOl and p55-R. Expression of such inhibitory isoformε in cells may constitute a mechanism of cellular self-protection against Fas/APOl- and TNF-mediated cytotoxicity. The wide heterogeneity of MACH isoforms, which greatly exceeds that observed for any of the other proteases of the CED3/ICE family, should allow a particularly fine tuning of the function of the active MACH isoforms. It is also posεible that εome of the MACH isoformε serve other functions. The ability of MACHβl to bind to both MORT1 and MACHαl suggests that this isoform could actually enhance the activity of the enzymatically active isoformε. The mild cytotoxicity observed in 293-EBNA and MCF7 cultures transfected with this isoform and the rather significant cytotoxic effect that it exerts in HeLa cells are likely to reflect activation of endogenously-expreεεed MACHα molecules upon binding to the transfected MACH/31 moleculeε. Conceivably, εome of the MACH iεoformε could also act as docking sites for molecules that are involved in other, non- cytotoxic effects of Faε/APOl and TNF receptors. Due to the unique ability of Fas/APOl and TNF receptors to cause cell death, as well as the ability of the TNF receptors to trigger other tissue-damaging activities, aberrations in the function of these receptors could be particularly deleterious to the organism. Indeed, both excessive and deficient functioning of these receptors have been shown to contribute to pathological manifestations of various diseaseε (Vaεεalli, 1992; Nagata and Golεtein, 1995) . Identifying the moleculeε that participate in the εignaling activity of the receptorε, and finding ways to modulate the activity of these molecules, could direct new therapeutic approaches. In view of the suεpected central role of MACHα in Faε/APOl- and TNF-mediated toxicity, it seems particularly important to design drugs that can block the proteolytic function of MACHα, as waε done for εome other proteinε of the CED3/ICE family (Thornberry et al . , 1994; Miller et al. , 1995; Maεhima et al. , 1995; Milligan et al. , 1995; Enari et al. , 1995; Loε et al. , 1995) . The unique sequence features of the CED3/ICE homolog within MACHα molecules could permit the deεign of drugs that would specifically affect its activity. Such drugs could provide protection from excessive immune- mediated cytotoxicity involving MACHα, without interfering with the physiological cell-death processes in which other members of the CED3/ICE family are involved. Other aspects of the invention will be apparent from the following examples. The invention will now be deεcribed in more detail in the following non-limiting examples and the accompanying drawings. It should also be noted that the procedures of: i) two-hybrid screen and two-hybrid 0-galactosidase expression test; (ii) induced expression, metabolic labeling and immunoprecipitation of proteins; (iii) in vi tro binding; (iv) assessment of the cytotoxicity; and (v) Northern and sequence analyses, as set forth in Examples 1 (see alεo Boldin et al. , 1995b) and 2 below, with respect to MORT-l and a MORT-l binding protein, are equally applic'ble (with some modifications) for the corresponding isolation, cloning and characterization of MACH and its isoformε. These procedures are thus to be construed as the full disclosure of the same procedures uεed for the iεolation, cloning and characterization of MACH in accordance with the present invention, as detailed in Example 3 below. EXAMPLE 1; Cloning and Isolation of the MORT-l Protein Which Binds to the Intracellular Domain of the FAS-R (i) Two-hybrid screen and two-hybrid ff-αalactosidase expression test To isolate proteins interacting with the intracellular domain of the FAS-R, the yeast two-hybrid system was used (Fields and Song, 1989) . Briefly, this two-hybrid system is a yeast-based genetic assay to detect specific protein-protein interactions in vivo by restoration of a eukaryotic tranεcriptional activator such as GAL4 that has two separate domainε, a DNA binding and an activation domain, which domainε when expressed and bound together to form a restored GAL4 protein, is capable of binding to an upstream activating sequence which in turn activates a promoter that controls the expression of a reporter gene, such as lacZ or HIS3, the expression of which is readily observed in the cultured cells. In this system, the genes for the candidate interacting proteins are cloned into separate expression vectors. In one expression vector, the sequence of the one candidate protein is cloned in phase with the sequence of the GAL4 DNA-binding domain to generate a hybrid protein with the GAL4 DNA-binding domain, and in the other vector, the sequence of the second candidate protein is cloned in phase with the sequence of the GAL4 activation domain to generate a hybrid protein with the GAL -activation domain. The two hybrid vectors are then co-transformed into a yeast host strain having a lacZ or HIS3 reporter gene under the control of upstream GAL4 binding sites. Only those transformed hoεt cells (cotransformants) in which the two hybrid proteins are expressed and are capable of interacting with each other, will be capable of expressing the reporter gene. In the case of the lacZ reporter gene, host cells expresεing this gene will become blue in color when X-gal is added to the cultures. Hence, blue colonies are indicative of the fact that the two cloned candidate proteins are capable of interacting with each other. Using this two-hybrid system, the intracellular domain, FAS-IC, was cloned, separately, into the vector pGBT9 (carrying the GAL4 DNA-binding sequence, provided by CLONTECH, USA, see below) , to create fusion proteins with the GAL4 DNA- binding domain. For the cloning of FAS-R into pGBT9, a clone encoding the full-length cDNA εequence of FAS-R (WO 9531544) waε used from which the intracellular domain (IC) was excised by standard procedures using various restriction enzymes and then isolated by standard procedures and inεerted into the pGBT9 vector, opened in itε multiple cloning εite region (MCS), with the correεponding suitable restriction enzymes. It should be noted that the FAS-IC extendε from amino acid reεidueε 175-319 of the intact FAS-R, this portion containing residues 175-319 being the FAS-IC inserted into the pGBT9 vector. The above hybrid (chimeric) vector waε then cotransfected together with a cDNA library from human HeLa cells cloned into the pGAD GH vector, bearing the GAL4 activating domain, into the HF7c yeast host strain (all the above-noted vectorε, pGBT9 and pGAD GH carrying the HeLa cell cDNA library, and the yeaεt εtrain were purchaεed from Clontech Laboratories, Inc., USA, as a part of MATCHMAKER Two- Hybrid System, #PT1265-1) . The co-transfected yeasts were selected for their ability to grow in medium lacking Histidine (His " medium) , growing colonieε being indicative of positive transformants. The selected yeaεt cloneε were then teεted for their ability to express the lacZ gene, i.e., for their LACZ activity, and this by adding X-gal to the culture medium, which is catabolized to form a blue colored product by β- galactosidase, the enzyme encoded by the lacZ gene. Thus, blue colonies are indicative of an active lacZ gene. For activity of the lacZ gene, it is necessary that the GAL4 transcription activator be present in an active form in the transformed clones, namely that the GAL4 DNA-binding domain encoded by the above hybrid vector be combined properly with the GAL4 activation domain encoded by the other hybrid vector. Such a combination iε only possible if the two proteins fused to each of the GAL4 domains are capable of stably interacting (binding) to each other. Thuε, the Hiε + and blue (LACZ + ) colonies that were isolated are colonies which have been cotranεfected with a vector encoding FAS-IC and a vector encoding a protein product of human HeLa cell origin that iε capable of binding stably to FAS-IC. The plasmid DNA from the above His + , LACZ + yeast colonies was isolated and electroporated into E. coli strain HBlOl by standard procedures followed by selection of Leu + and Ampicillin resistant transformantε, theεe tranεformantε being the ones carrying the hybrid pGAD GH vector which has both the Amp R and Leu2 coding sequences. Such transformants therefore are clones carrying the sequences encoding newly identified proteins capable of binding to the FAS-IC. Plasmid DNA waε then iεolated from theεe transformed E. coli and retested by: (a) retransforming them with the original FAS-R intracellular domain hybrid plaεmid (hybrid pGTB9 carrying the FAS-IC) into yeast strain HF7 as set forth hereinabove. As controls, vectorε carrying irrelevant protein encoding sequences, e.g., pACT-lamin or pGBT9 alone were used for cotransformation with the FAS-IC-binding protein (i.e., MORT-l) -encoding plasmid. The cotransformed yeasts were then tested for growth on His " medium alone, or with different levels of 3-aminotriazole; and (b) retransforming the plasmid DNA and original FAS- IC hybrid plasmid and control plasmids described in (a) into yeaεt host cells of strain SFY526 and determining the LACZ + activity (effectivity of β-gal formation, i.e., blue color formation) . The results of the above tests revealed that the pattern of growth of colonies in Hiε " medium waε identical to the pattern of LACZ activity, as asεessed by the color of the colony, i.e., His + colonies were also LACZ + . Further, the LACZ activity in liquid culture (preferred culture conditionε) waε assessed after transfection of the GAL4 DNA-binding and activation-domain hybrids into the SFY526 yeast hostε which have a better LACZ inducibility with the GAL4 tranεcription activator than that of the HF7 yeast host cells. Using the above procedure, a protein called previously designated, and now referred to as MORT-l for "Mediator of Receptor-induced Toxicity", waε identified, iεolated and characterized. Furthermore, it εhould alεo be mentioned that in a number of the above two-hybrid /J-galactosidaεe expreεεion teεts, the expression of 3-galactosidase was also asseεεed by a preferred filter assay. In the screening, five of about 3xl0 6 cDNAs were found to contain the MORT-l insert. The so- isolated cloned MORT-l cDNA inserts were then sequenced using standard DNA sequencing procedures. The amino acid εequence of MORT-l (SEQ ID NO:2) waε deduced from the DNA sequence. Residue numbering in the proteins encoded by the cDNA inserts are as in the Swisε-Prot data bank. Deletion mutantε were produced by PCR, and point mutantε by oligonucleotide-directed mutageneεiε (Current Protocolε in Molec. Biol., 1994) . (ii) Induced expression, metabolic labeling and immunoprecipitation of proteins MORT-l, N-linked to the FLAG octapeptide (FLAG-MORT-l; Eastman Kodak, New Haven, Ct. , USA), Fas-IC, FAS-R, p55-R, a chimera comprised of the extracellular domain of p55-R (amino acids 1-168) fused to the transmembrane and intracellular domain of FAS-R (amino acidε 153-319) , and the luciferaεe cDNA which serves as a control, were expressed in HeLa cells. Expression was carried out using a tetracycline-controlled expresεion vector, in a HeLa cell clone (HtTA-1) that expresses a tetracycline-controlled transactivator (Gossen and Bujard, 1992; see also Boldin et al. , 1995) . Metabolic labeling with [ 35 S]methionine and [ 35 S] cysteine (DUPONT, Wilmington, DE, USA and Amersham, Buckinghamshire, England) was performed 18 hourε after transfection, by a further 4h incubation at 37°C in Dulbecco's modified Eagle's medium lacking methionine and cysteine, but supplemented with 2% dialyzed fetal calf serum. The cells were then lysed in RIPA buffer (10 mM Tris-HCl, pH 7.5, 150 mM NaCl, 1% NP-40, 1% deoxycholate, 0.1% SDS and 1 mM EDTA) and the lysate waε precleared by incubation with irrelevant rabbit antiεerum (3 μl/ml) and Protein G Sepharoεe beads (Pharmacia, Uppεala, Sweden; 60 μl/ml) . Immunoprecipitation waε performed by lh incubation at 4°C of 0.3 ml aliquots of lysate with mouse monoclonal antibodies (5 μl/aliquot) against the FLAG octopeptide (M2; Eastman Kodak), p55-R (#18 and #20; Engelmann et al., 1990), or FAS-R (ZB4; Kamiya Southand Oakε, Ca. , USA), or with isotype matched mouse antibodies as a control, followed by a further lh incubation with Protein G Sepharoεe beadε (30 μl/aliquot) . (iii) In vitro binding Glutathione S-transferase (GST) fusions with the wild type or a mutated Fas-IC were produced and adsorbed to glutathione-agarose beadε; see Boldin et al. , 1995; Current Protocols in Molecular Biology, 1994; Frangioni and Neel, 1993) . Binding of metabolically-labeled FLAG-MORT-1 fusion protein to GST-Fas-IC was assesεed by incubating the beadε for 2h at 4°C with extracts of HeLa cellε, metabolically labeled with [ 35 S]methionine (60 μCi/ml) , that expreεs FLAG-MORT-l. The extracts were prepared in a buffer containing 50 mM Tris¬ HCl, pH 7.5, 150 mM NaCl, 0.1% NP-40, 1 mM dithiotreitol, 1 mM EDTA, 1 mM phenylmethylsulfonyl fluoride, 20 μg/ml Aprotonin, 20 μg/ml Leupeptin, 10 mM sodium fluoride and 0.1 mM sodium vanadate (1 ml per 5xl0 5 cells) . (iv) Assessment of the cytotoxicity triggered bv induced expression of MORT-l MORT-l, Fas-IC, p55-IC and luciferase cDNAs were inserted into a tetracycline-controlled expression vector and transfected to HtTA-1 cells (a HeLa cell line) (Gossen and Bujard, 1992) together with the secreted placental alkaline phosphataεe cDNA, placed under control of SV40 promoter (the pSBC-2 vector, Dirks et al. , 1993) . Cell death was assessed 40 hours after transfection, either by the neutral-red uptake assay (Wallach, 1984) or, for asseεsing specifically the death in those cells that express the transfected cDNAs, by determining the amounts of placental alkaline phosphatase (Berger et al. , 1988) secreted to the growth medium at the last 5 hours of incubation. In another set of experiments to analyze the region of the MORT-l protein involved in the binding to the FAS-IC, the following proteins were expressed transiently in HeLa cells that contain a tetracycline-controlled transactivator (HtTA-1) , using a tetracycline-controlled expression vector (pUHD10-3) : Human FAS-R alone; Human FAS-R as well as the N- terminal part of MORT-l (amino acidε 1-117, the "MORT-l head") ; Human FAS-R aε well aε the C-terminal part of MORT-l, which contains its 'death domain" homology region (amino acids 130-245, the "MORT-l DD"); FLAG-55.11 (amino acids 309-900 of protein 55.11 fused at the N-terminus to the FLAG octapeptide, the protein 55.11 being a p55-IC-specific binding protein. Twelve hours after transfection, the cells were trypsinized and re-seeded at a concentration of 30,000 cells/well. After 24 hrε further incubation, the cells were treated for 6 hrs with a monoclonal antibody against the extracellular domain of FAS-R (monoclonal antibody CH-11, Oncor, Gaithersburg, MD, USA) at various concentrations (0.001-10 μg/ml monoclonal antibody) , in the presence of 10 μg/ml cycloheximide. Cell viability was then determined by the neutral-red uptake assay and the results were presented in terms of % viable cells aε compared to cells that had been incubated with cycloheximide alone (in the absence of anti-FAS-R monoclonal antibody CH¬ ID . (v) Northern and sequence analyses Poly A + RNA was isolated from total RNA of HeLa cells (Oligotex-dT mRNA kit. QIAGEN, Hilden, Germany) . Northern analysis using the MORT-l cDNA as a probe was performed by conventional methods (see Boldin et al. , 1995) . The nucleotide sequence of MORT-l was determined in both directions by the dideoxy chain termination method. Sequence analysis of the MORT-l cDNA cloned by the two-hybrid procedure indicated that it encodes a novel protein. Applying the two-hybrid test further to evaluate the specificity of the binding of this protein (MORT-l for "Mediator of Receptor-induced Toxicity") to Fas-IC, and to define the particular region in Fas-IC to which it binds, led to the following findings (Figure 1) : (a) The MORT-l protein binds both to human and to mouse Fas-IC, but not to several other tested proteins, including three receptors of the TNF/NGF receptor family (p55 and p75 TNF receptors and CD40) ; (b) Replacement mutations at position 225 (lie) in the 'death domain' of FAS-R, shown to abolish signaling both in vitro and in vivo (the lp * mutation (Watanabe-Fukunaga et al. , 1992; Itoh and Nagata, 1993) , also prevents binding of MORT-l to the FAS-IC; (c) The MORT-l binding-site in FAS-R occurs within the 'death domain' of this receptor; and (d) MORT-l binds to itself. This self-binding, and the binding of MORT-l to FAS-R involve different regions of the protein: A fragment of MORT-l corresponding to residues 1-117 binds to the full-length MORT-l, but does not bind to itself nor to the FAS-IC. Conversely, a fragment corresponding to residues 130-245 binds to FAS-R, yet does not bind to MORT-l (Fig. 1) . Furthermore, it is apparent from the results in Fig. 1 that the 'death domain 1 region of FAS-R is critical for FAS-IC self- association, as is the 'death domain' region of p55-R for p55- IC self-association. The deletions on both sides of these 'death domains' does not affect the self-association ability thereof while, however, a deletion within these 'death domains' doeε affect the self-association. In the case of MORT-l, the binding of MORT-l to FAS-IC is also dependent upon the complete (full) 'death domain' of FAS-R, while however, it iε also not dependent on the regions outεide of the FAS-R 'death domain' region for FAS-IC binding. In Fig. 1, there is depicted the interaction of the proteins encoded by the Gal4 DNA binding domain and activation-domain conεtructs (pGBT9 and pGAD-GH) within transfected SFY526 yeastε aε aεεessed by /3-galactosidase expresεion filter assay. The DNA-binding-do ain constructs included four constructs of the human Fas-IC, four constructs of the mouse Fas-IC including two full-length constructs having lie to Leu or lie to Ala replacement mutations at position 225 (I225N and I225A, reεpectively) , and three MORT-l constructs, all of which are shown schematically on the left hand side of Fig. 1. The activation-domain constructs included three MORT-l constructs, the MORT-l portion being as in the DNA-binding-domain constructs; and a full-length human Fas-IC construct, the Fas-IC portion being the same as in the above DNA-binding domain construct. The intracellular domains of human p55 TNF receptor (p55-IC residues 206-426) , human CD40 (CD40-IC, residues 216-277) and human p75 TNF receptor (p75-IC, residues 287-461) as well as lamin, cyclin D and "empty" Gal4 (pGBT9) vectors served as negative controls in the form of DNA-binding domain conεtructε. SNF-1 and SNF4 served as positive controls in the form of DNA-binding-domain (SNF1) and activation-domain (SNF4) constructs. "Empty" Gal4 vectors (pGAD-GH) also served as negative controls in the form of activation domain constructs. The symbols "++" and "+" denote the development of strong color within 30 and 90 min of the assay, respectively; and "-" denoteε no development of color within 24h. Combinations for which no score is given have not been tested. Expression of MORT-l molecules fused at their N terminus with the FLAG octapeptide (FLAG-MORT-1) yielded in HeLa cells proteins of four distinct sizeε - about 27, 28, 32, and 34 kD. The interaction of MORT-l with Fas-IC in vi tro was observed by performing an immunoprecipitate of proteins from extracts of HeLa cells transfected with the FLAG-MORT-1 fusion protein or with luciferase cDNA as a control, the immunoprecipitation being performed with anti-FLAG antibody (cxFLAG) . The interaction in vi tro waε also demonstrated between MORT-l and FAS-IC wherein MORT-l is in the form of [ 35 S] methionine-metabolically labeled FLAG-MORT-1 fusion proteins obtained from extracts of transfected HeLa cells and FAS-IC is in the form of human and mouse GST-FAS-IC fusion proteins including one having a replacement mutation at position 225 in FAS-IC, all of which GST-FAS-IC fusion proteins were produced in E. coli . The GST-fusion proteins were attached to glutathione beads before interaction with the extractε containing the MORT-1-FLAG fusion protein following this interaction, SDS-PAGE was performed. Thus, the in vi tro interaction waε evaluated by assessing, by autoradiography following SDS-PAGE, the binding of [ 35 S] metabolically labeled MORT-l, produced in transfected HeLa cells as a fuεion with the FLAG octapeptide (FLAG-MORT-1) , to GST, GST fusion with the human or mouse Fas-IC (GST-huFas-IC, GST-mFaε-IC) or to GST fuεion with Fas-IC containing a lie to Ala replacement mutation at poεition 225. It waε shown that all four FLAG- MORT-1 proteins showed ability to bind to Faε-IC upon incubation with a GST-Fas-IC fusion protein. Aε in the yeaεt two-hybrid teεt (Fig. 1) , MORT-l did not bind to a GST-Fas-IC fusion protein with a replacement at the lp2? g mutation εite (I225A) . The proteinε encoded by the FLAG-MORT-1 cDNA εhowed also an ability to bind to the intracellular domain of FAS-R, as well as to the intracellular domain of FAS-R chimera whose extracellular domain was replaced with that of p55-R (p55- FAS) , when co-expresεed with theεe receptorε in HeLa cells. In this case, interaction of MORT-l with FAS-IC in transfected HeLa cells, i.e., in vivo, as observed with immunoprecipitates of various transfected HeLa cells demonstrated the in vivo interaction and specificity of the interaction between MORT-l and FAS-IC in cells co-transfected with constructs encoding these proteins. Thus, FLAG-MORT-1 fusion protein was expressed and metabolically labeled with [ 35 S] cystein (20 μCi/ml) and [ 35 S]methionine (40 μCi/ml) in HeLa cells, alone, or together with human FAS-R, FAS-R chimera in which the extracellular domain of FAS-R was replaced with the corresponding region in the human p55-R (p55-FAS) , or the human p55-R, as negative control. Cross immunoprecipitation of MORT-l with the co-expressed receptor was performed using various specific antibodies. The results indicated that, FLAG-MORT-1 is capable of binding to the intracellular domain of FAS-R, as well as to the intracellular domain of a FAS-R- p55-R chimera having the extracellular domain of p55-R and the intracellular domain of FAS-R, when co-expressed with these receptorε in the HeLa cellε. Further, immunoprecipitation of FLAG-MORT-1 from extractε of the transfected cells also resulted in precipitation of the co-expressed FAS-R or the co- expressed p55-FAS chimera. Conversely, immunoprecipitation of these receptors resulted in the coprecipitation of the FLAG- MORT-1. Northern analyεiε using the MORT-l cDNA as probe revealed a single hybridizing transcript in HeLa cells. In a Northern blot in which poly A + RNA (0.3 μg) from tranεfected cellε waε hybridized with MORT-l cDNA, the size of the RNA tranεcript (about 1.8 kb) waε found to be cloεe to the εize of the MORT-l cDNA (about 1702 nucleotides) . In sequence analysiε, the cDNA was found to contain an open reading frame of about 250 amino acids. Fig. 2 depicts the preliminary nucleotide (SEQ ID NO:l) and deduced amino acid sequence (SEQ ID NO:2) of MORT-l in which the 'death domain 1 motif is underlined, aε is a possible start Met residue (position 49; bold, underlined M) and the translation stop codon (the aεterik under the codon at position 769-771) . This 'death domain' motif shareε homology with the known p55-R and FAS-R 'death domain' motifε (p55DD and FAS-DD) . In order to determine the precise C-terminal end of MORT-l and to obtain evidence concerning the precise N-terminal (initial Met residue) end of MORT-l, additional experiments were carried out as follows: Using the methods described above, a number of constructs encoding MORT-l molecules fused at their N-terminus with the FLAG octapeptide (FLAG-MORT-l) were constructed and expressed in HeLa cells with metabolic labeling of the expressed proteins using 35 S-cysteine and 35 S-methionine. The MORT-l-FLAG molecules were encoded by the following cDNAs containing different portions of the MORT-l-encoding sequence: i) The FLAG octapeptide cDNA linked to the 5' end of the MORT-l cDNA from which nucleotides 1-145 of SEQ ID N0:1 (see Fig. 2) have been deleted; ii) The FLAG octapeptide cDNA linked to the 5' end of the MORT-l full length cDNA; iii) The FLAG octapeptide cDNA linked to the 5' end of the MORT-l cDNA from which nucleotides 1-145 as well as nucleotides 832-1701 of SEQ ID NO:l (Fig. 2) have been deleted and the codon GCC at position 142-144 was mutated to TCC to prevent start of translation at thiε site. Following expression of the above FLAG-MORT-1 fusion products, immunoprecipitation was carried out aε mentioned above, uεing either anti-FLAG monoclonal antibodieε (M2) or as a control, anti-p75 TNF-R antibodies (#9) , followed by SDS- PAGE (10% acrylamide) and autoradiography. The results of the analysis with the above FLAG-MORT-1 fusion products confirmed (validated) the C-terminal end of MORT-l and have provided evidence that the N-terminal end of MORT-l may be at position 49 of the sequence in Fig. 2. Indeed, it has been shown by additional expression experiments of MORT-l without the FLAG octapeptide fused to its 5 '-end, that Met 49 serves as an effective site of translation initiation. A search conducted in the 'Gene Bank' and 'Protein Bank' DataBases revealed that there iε no sequence corresponding to that of the above isolated MORT-l sequence. Thus, MORT-l represents a new FAS-IC-specific binding protein. High expression of p55-IC results in triggering of a cytocidal effect (Boldin et al. , 1995) . The expresεion of Fas-IC in HeLa cells also has such an effect, though to a lower extent, which could be detected only with the use of a sensitive assay. The ligand independent triggering of cytocidal effects in cells transfected with MORT-l, as well as human p55-IC and FAS-IC, was thus analyzed. The effect of transient expression of MORT-l, human Fas-IC, human p55-IC, or luciferase that served as a control, on the viability of HeLa cells was assessed using a tetracycline-controlled expression vector. Cell viability was evaluated 40 min after transfecting these cDNAs either in the presence or absence of tetracycline (1 μg/ml, to block expression) , together with a cDNA encoding the secreted placental alkaline phosphatase. Cell viability was determined either by the neutral red uptake assay or, for determining specifically the viability of those particular cells that express the transfected DNA, by measuring the amounts of placental alkaline phoεphatase secreted to the growth medium. The above analysis revealed that the expression of MORT-l in HeLa cells resulted in significant cell death, greater than that caused by FAS-IC expresεion. These cytotoxic effects of all of p55-IC, FAS-IC and MORT-l seem to be related to the 'death domain' regions, present in all of these proteins, which 'death domains' have a propensity to self- associate, and thereby posεibly prompting the cytotoxic effects. In view of the above mentioned characteristics of MORT-l, namely, the specific aεεociation of MORT-l with that particular region in FAS-R which is involved in cell death induction, and the fact that even a slight change of εtructure in that region, which preventε εignaling (the lp f & mutation) aboliεheε also the binding of MORT-l, indicates that this protein plays a role in the signaling or triggering of cell death. This notion is further supported by the observed ability of MORT-l to trigger by itself a cytocidal effect. Thus, MORT-l may function as (i) a modulator of the self- aεεociation of FAS-R by itε own ability to bind to FAS-R as well aε to itεelf, or (ii) serve as a docking site for additional proteins that are involved in the FAS-R signaling, i.e., MORT-l may be a 'docking' protein and may therefore bind other receptors besides FAS-R, or (iii) constitutes part of a distinct signaling system that interactε with FAS-R signaling. In order to further analyze the regions of MORT-l involved in FAS-IC binding and modulation of the FAS-R- mediated cellular effects (cytotoxicity) , the above-mentioned experiments were carried out, using vectors encoding portionε of MORT-l (the 'MORT-l head', amino acidε 1-117 and the 'MORT- 1 dd' , amino acidε 130-245) (εeparately) , with a vector encoding the human FAS-R for co-transfections of HeLa cells. In these experiments, the various proteins and combinations of proteins were expressed transiently in HeLa cells that contain a tetracycline-controlled transactivator (HtTA-1) by inserting the sequenceε encoding the proteinε into a tetracycline- controlled expression vector pUHD10-3. Control transfections employed vectors encoding only the FAS-R and vectors encoding the FLAG-55.11 fusion protein (the 55.11 protein being a p55- IC-specific binding protein of which a portion containing amino acids 309-900 was fused (at its N-terminal) to the FLAG octapeptide) . Following the transfection and incubation periods, the transfected cellε were treated with variouε concentrationε of an anti-FAS-R monoclonal antibody (CH-11) which bindε εpecifically to the extracellular domain of FAS-R expressed by cells. This binding of anti-FAS-R antibody induces the aggregation of the FAS-R at the cell surface (much like the FAS-R ligand) and induces the intracellular εignaling pathway mediated by the FAS-IC, resulting, ultimately, in cell death (FAS-R mediated cell cytotoxicity) . The concentrations of the anti-FAS-R monoclonal antibody (CH-11) used were in the range of 0.01-10 μg/ml, usually concentrations such as 0.005; 0.05; 0.5 and 5 μg/ml. The cells were treated with the anti-FAS antibody in the presence of 10 μg/ml cycloheximide. The resultε of the above analysis show that the expression of FAS-R in the transfected cells conveyε an increaεed εenεitivity to the cytocidal effects of the anti- FAS-R antibodies (compare "fas" to "55.11") . Further, the co- expression of the region in MORT-l that contains the 'death domain' homology region and FAS-R ("fas + MORT-l dd) strongly interferes with FAS-induced (i.e. FAS-R mediated) cell death as would be expected from the ability of the MORT-l 'death domain' (DD) region to bind to the FAS-R 'death domain' (FAS- DD) . Moreover, co-expression of the N-terminal part of MORT-l and FAS-R ("fas + MORT1 he") does not interfere with FAS-R- mediated cell death and, if at all, somewhat enhances the cytotoxicity (i.e., slightly increased cell death) . Thus, the above results clearly indicated that the MORT-l protein has two distinct regions as far as binding to the FAS-IC and mediation of the cell-cytotoxic activity of the FAS-IC are concerned. Theεe results therefore also provide a baεiε for the use of different parts (i.e., active fragments or analogs) of the MORT-l protein for different pharmaceutical applications. For example, the analogs or fragments or derivatives thereof of the MORT-l protein which contain essentially only the C- terminal portion of MORT-l inclusive of its 'death domain' region may be uεed for inhibiting FAS-R-mediated cytotoxic effects in FAS-R containing cells or tissues and thereby protect these cells or tissues from the deleterious effects of the FAS-R ligand in cases such as, for example, acute hepatitiε. Alternatively, the analogε or fragmentε or derivativeε thereof of the MORT-l protein which contain essentially only the N-terminal portion of MORT-l may be used for enhancing the FAS-R-mediated cytotoxic effects in FAS-R containing cells and tissues, thereby leading to the enhanced destruction of these cells or tissues when desired in cases such as, for example, tumor cells and autoreactive T and B cellε. Aε detailed herein above, the above uses of the different regions of MORT-l may be carried out using the various recombinant viruses (e.g., Vaccinia) to insert the MORT-l region-encoding sequence into εpecific cells or tissueε it is desired to treat. Furthermore, it is also posεible to prepare and use various other molecules such as, antibodieε, peptides and organic moleculeε which have sequences or molecular structures corresponding to the above noted MORT-l regions in order to achieve the same desired effects mediated by these MORT-l regions. Moreover, MORT-l may be utilized to specifically identify, isolate and characterize other proteins which are capable of binding to MORT-l (i.e., MORT-l-binding proteins); see Examples 2 and 3. EXAMPLE 2: Isolation of a MORT-l Binding Protein (i) Two-hvbrid screen and two-hvbrid fl-galactosidase expression test In a manner analogous to the procedure described in Example 1, using the intracellular domain of p55 TNF-R (p55 IC) and MORT-l as baits, and screening a human B-cell library, two cDNA cloneε were obtained, which encode a protein product capable of binding to both MORT-l and p55-IC. Both clones have identical nucleotide sequenceε at the 5' end aε shown in Fig. 3 (SEQ ID NO:3) . (ii) Binding properties of the newly cloned cDNA, in two hvbrid screens Using the above-mentioned yeast two-hybrid procedure, a construct containing the new MORT-l-binding protein cDNA was used as a "prey" to which were added constructs of a number of "baits" in separate reactions, to determine the binding specificity of the MORT-l-binding protein encoded by this cDNA. These "baits" included constructε encoding MORT-l, portions of MORT-l (MORT 'head', aal-117, MORT 'tail*, aa 130-245), the p55 IC (206-426 p55) or portion thereof (the 'death domain', 326-426 p55; and others upεtream of the 'death domain' i.e. 206-326) . The reεults are shown in Table 2. TABLE 2 The above results of the two-hybrid 0-galactosidase expresεion test of the binding of the clone to a large panel of baits confirmed that the protein encoded by this clone binds specifically to the death domainε of both the p55 TNF-R and MORT-l. In general, the MORT-l binding protein may be utilized directly to modulate or mediate the MORT-l aεsociated effects on cellε, or, indirectly, to modulate or mediate the FAS-R ligand effect on cellε when thiε effect is modulated or mediated by MORT-l. The εame holdε true with reεpect to other intracellular proteins or intracellular domains of transmembrane proteins, as specifically demonstrated for the p55 TNF-R herein. MORT-l-binding proteins include those which bind specifically to the entire MORT-l protein or those which bind to different regions of the MORT-l protein, e.g., the above- noted N- and C-terminal regions of MORT-l. The MORT-l-binding proteins which bind specifically to such regions may be used to modulate the activity of these regions and hence the specific activity of MORT-l as determined by these regions. EXAMPLE 3; Isolation and Characterization of the MACH Protein, Another MORT-l Binding Protein (i) Two-hvbrid screen, two-hybrid ff-galactosidase test, sequencing and sequence analysis Using the procedure set forth in Examples 1 and 2 above, a full length construct encoding human MORT-l protein was employed as a "bait" in the yeaεt two-hybrid system to isolate a cDNA clone encoding an additional new MORT-l binding protein. This new protein was originally designated MORT-2, and ' now redesignated and referred to as MACH (for MORT-l associated CED3 homolog) , by virtue of its characteristics as detailed herein below. Thiε cDNA clone waε sequenced by εtandard procedures as set forth in Examples 1 and 2 above. Sequence analysis by standard procedures and computer programs (see Exampleε 1 and 2) revealed that this cDNA has a novel sequence and encodeε a novel protein (neither the DNA nor the amino acid εequenceε waε found in GENBANK or PROTEIN BANK sequence databaεes) . Further, the cDNA encoding MACH waε revealed an ORF-B open reading frame which has strong homology to the region above (5 1 upstream) the 'death domain' motif of the MORT-l protein (see Example 1) . In Figs. 4A-C, the structure of that part of the MACH cDNA clone which contains ORF-B (235 aa residueε; Fig. 4A) ; the deduced amino acid εequence (SEQ ID NO:5) of the MACH ORF-B (Fig. 4B) ; and the nucleotide εequence (SEQ ID NO:4) of the MACH cDNA molecule (Fig. 4C) are shown. In Fig. 4A, the hatched region of ORF-B is the region sharing high homology with the region of MORT-l upstream of the MORT-l 'death domain" motif, and this MACH ORF-B region of homology conεisting of the amino acid residues underlined in Fig. 4B. The yeast two-hybrid test was further applied to evaluate the specificity of binding of MACH to MORT-l, in particular, to define the region in MORT-l to which MACH binds, as well as to determine which of the MACH ORFs interacts with MORT-l, the procedures being as set forth herein above in Examples 1 and 2. Briefly, various MORT-l and MACH constructs were prepared for testing the interaction of the proteins encoded by the Gal4 DNA-binding domain and activation domain constructs within transfected SFY526 yeast cells as asεessed by the 3-galactosidase expression filter assay. The DNA-binding domain constructε were prepared in pGBT9 vectorε and the activation domain constructs were prepared in pGAD-GM vectors. For the activation domain constructε, the full-length MACH cDNA waε used (MACH) , aε waε a construct encoding only the ORF-B (MACH B) region. Control activation domain constructs were those containing the full- length MORT-l coding seguence (MORT 1, positive control) and those having no insertε, i.e., "empty" vectors (pGAD-GM) . For the DNA-binding domain constructs, the full-length MORT-l cDNA waε uεed (MORT 1) , aε were constructs encoding only the MORT-l upstream region (MORT- IDD aa 130-245) . Control DNA-binding domain conεtructs, which were constructed to determine also the specificity of the MACH binding, included constructs encoding lamin (Lamin) , residues 287-461 of the intracellular domain of the human p75 TNF-R (human p75 IC) , cyclic D (cycD) , SNF1, residues 206-426 of the intracellular domain of the human p55 TNF-R (human p55 IC) , the 'death domain' region of the intracellular domain of the human Faε-R (human Fas DD) , residues 216-277 of the intracellular domain of the human CD40 (human CD40 IC) , vectors without insert or "empty" pGBT9 vectors (pGBT9, negative control), and a construct encoding the ORF-B region of MACH (MACH B) . In the asεay, the development of color was determined, where the greater the color development, the greater the interaction between the constructs encoded by the DNA-binding domain and activation domain. Color development was depicted by symbols, where - ■ +++ " and "+" indicate the development of a strong color within 30 and 90 min. of the assay, respectively, and " " indicates the lack of development of color within 24 hrs. of the assay. In caseε where interactionε were not tested, no symbol was indicated. The results of the various interactions for the above case are set forth in Table 3, while the reεultε of the various interactions of the MACH isoforms are depicted in Fig. 5. TABLE 3 Thus, as arises from the results shown in Table 3 above, it is apparent that: (a) MACH binds to MORT-l in a very strong and specific manner; (b) The MACH binding site in MORT-l occurs before (upstream of) the 'death domain' motif in MORT-l, i.e., it is in the region of MORT-l defined by aa 1-117 of MORT-l; (c) The ORF-B region of MACH is the M0RT-1- interacting region of the MACH protein; and (d) The MACH ORF-B region is capable of self- association. (ii) Cell-cvtotoxic effects mediated bv the self-association capability of the MACH protein The observation that MACH can self-associate, in particular, that the ORF-B region of MACH self-associates and the previous correlation between self-aεεociation and cell- cytotoxicity as obεerved for the intracellular domainε of p55 TNF-R and FAS-R, and as observed for MORT-l (see Example 1) , suggested that MACH self-association may also be involved in cell-cytotoxicity. In order to test this possibility, constructε encoding MACH were prepared with a tetracycline-controlled expreεεion vector (for details see Example 1) . These conεtructε were uεed to transfect HeLa cells in which the vectors were transiently expressed. Besides the MACH constructs, other control constructs were used to evaluate the effect of transient expression on the viability of the HeLa cells to which the effect of the MACH constructs could be compared. These other constructs included MORT-l, human FAS- IC and luciferase (Luc) . In addition, co-transfection of the HeLa cells was also teεted by uεing MORT-l and MACH conεtructs to determine what effects the interaction between these proteins would cauεe. After transfection the HeLa cells were incubated and cell viability was evaluated 48 hrs. after transfection either in the presence or the absence of tetracycline (1 μg/ml) to block expression. Cell viability was determined by the neutral red uptake asεay. 16 The results are shown in Fig. 6, which depicts graphically the ligand-independent triggering of cytocidal effects in cells transfected with MACH in comparison to cells transfected with constructs encoding the other proteins as well as cotransfected cells (M0RT1 + MACH) . The results are shown as the cell viability in OD units at 540 nm for each construct, wherein for each construct a hatched bar indicates incubation of cells following transfection in the absence of tetracycline, and a filled bar indicates incubation of the transfected cells in the presence of tetracycline. From the reεultε shown in Fig. 6, it is apparent that MACH induces a dramatic cytotoxic effect in HeLa cells, i.e., the induced overexpression of MACH cDNA in HeLa cells, resulting in a dramatic cytotoxic effect. This cytotoxic effect is likely to be related to the self-association capability of MACH. (iii) Northern analysis Using well-known procedures (see Example 1) , Northern analysiε of several cell lines was carried out using the MACH cDNA as a probe. The results of this analysis show that in a large number of cell lines, in particular, CEM, Raji, Daudi, HeLa, Alexander, Juskat and A673 cell- lines, there exist two hybridizing transcripts of approximately 3.2kb in size. In view of the above, the MACH protein, particularly the MACHβl protein (ORF-B of MACH) may be utilized directly to modulate or mediate the MORT-l associated effects on cells, or, indirectly, to modulate or mediate the FAS-R ligand effect on cells when this effect is modulated or mediated by MORT-l. The fact that MACH binds specifically to the upstream region of MORT-l and shares homology with MORT-l provides for a specific way in which MACH or MACH ORF-B may be used to modulate this specific region of MORT-l and hence the εpecific activity of MORT-l determined by this upstream region. Further, MACH or MACH ORF-B may be used as a modulator or mediator of intracellular effects in an analogous way to MORT- 1 itself (see above) by virtue of MACH'ε ability to εelf- aεεociate and induce cell-cytotoxicity on its own. Further analyses of the MACH protein and the DNA sequences encoding it have been performed as set forth herein below. Further, it was revealed that ORF-B of MACH represents but one of a number of MACH isoformε. Hence, the MACH protein and the DNA sequences encoding it have now been renamed, as will become apparent from the following. (a) Two hvbrid screen for proteins that bind to MORT-l reveals a novel protein which shares a seguence motif with MORT-l: As mentioned above, to identify proteins which participate in the induction of cell death by MORT-l, the two- hybrid technique was used to screen cDNA libraries for proteins that bind to MORT-l. A two-hybrid screen of a human B cell library (Durfee et al. , 1993) using MORT-l cDNA as bait yielded cDNA clones of MORT-l itself, reflecting the ability of thiε protein to self-associate as well as clones of TRADD, to which MORT-l binds effectively (see Example 2) . The screen also yielded cDNA clones of a novel sequence whose product specifically bound to MORT-l. The protein, which initially was called MACH, and later, after finding that it occurs in multiple isoforms (see below) , renamed MACH51, showed also an ability to bind in a two hybrid test to itεelf, yet waε unable to bind to FAS-R. In Fig. 5, there iε εhown the reεults of the interaction of MORT-l and MACH within transfected yeast cells. Briefly, MORT-l and MACH01 and their deletion constructs, as well aε MACHαl, a MACHαl mutant in which the catalytic cyεteine Cys 360 is replaced by Ser (MACHcxl (C360S) ) and the intracellular domain of human FAS-R (Faε-IC) , were expressed within transfected SFY526 yeast in Gal4 DNA binding domain and activation domain constructs (pGBT9 and pGAD-GH) . Their interaction was asεeεsed by a β-galactosidase expression filter asεay aε described in Boldin et al. (1995b) . The resultε are preεented in terms of the time required for the development of strong color. ND indicates that the assay was not done. None of the insertε examined interacted with a number of tested negative controls, including the intracellular domains of human p55 TNF receptor, p75 TNF receptor and CD40, and lamin, cyclin D and 'empty' Gal4 vectors. MACH/Jl was cloned by two hybrid screening of a Gal4 AD-tagged human B cell library (Durfee et al . , 1993) for proteins that bind to MORT-l, using the HF7c yeast reporter strain. Except where otherwise indicated, all experimental procedures for the findings presented are as described above (see also Boldin et al. , 1995) . Deletion analysis showed that MACHβl binds to the N-terminal part of MORT-l, which is involved in cell death induction (Chinnaiyan et al. 1995) . MACH01 also self-associated in the transfected yeast. However, it did not bind to several control proteins and unlike MORT-l was unable to bind to FAS-R (Fig.5) . Expression of MACH01 molecules in mammalian cells yielded a 34 kDa protein that bound to MORT-l moleculeε co-expressed with it. It was also able to bind to a GST-MORT-1 fusion protein in vi tro . Comparison of the amino acid sequences in MACH/31 and MORT-l revealed a shared sequence motif (designated "Mort module") in these two proteins, distinct from the death motif through which MORT-l binds to FAS-R. This motif occurs once in MORT-l and twice in MACHjSl. The εame motif is found also in PEA-15, an aεtrocyte phosphoprotein of unknown function. Preliminary data suggest that the MORT motif is involved in the binding of MACHβl (and of other MACH isoforms) to MORT-l. Fig. 7A depicts the deduced amino acid sequence (SEQ ID NO:5) of MACHβl. The two MORT moduleε are boxed and the C- termini of the two MACHjSl deletion mutantε employed (Fig. 7) are denoted by aεteriεks. Fig. 7B showε the sequence homology of the modules in MACHβl (designated MACH in Fig. 7B) , MORT-l and the PEA-15 gene (accession number X86809) . Identical and εimilar reεidueε are denoted by boxed and εhaded areas, respectively. Fig. 8 shows a diagrammatic representation of the death domain and MORT modules and of the CED3/ICE homology region in Fas/APOl, MACHβl and MACHαl. The region in MORT-l that contains this 'MORT module' has been shown to take part in cell death induction by this protein (see Example 1 above) . It has been shown also to contribute to, though not to suffice in, the εelf aεsociation of MORT-l (see Example 1) . As shown in Fig. 5, analysis of the binding properties of deletion constructε of MACHjSl in transfected yeasts revealed similar involvement of the MORT modules in self-association of MACH l, as well as in its binding to MORT-l: Deletion constructs, in which the region below (downstream of) the MORT module was missing, were unable to bind to each other, yet maintained the ability to bind to the full length MORT-l and to the full length MACHJl. A further truncation in which part of the MORT module sequence was also deleted, resulted in loss of the binding ability of the proteins. To further assess the involvement of the MORT modules in these interactions, deletion mutants of MACH01, fused with the FLAG octapeptide (FLAG-MACHβl) , were expressed in HeLa cells and assesεed for their binding in vi tro to bacterial-produced glutathione-S-transferase-MORT-1 fusion protein (GST-MORT-1) . As shown in Figs. 9A-C, similarly to the binding observed in the yeast two-hybrid test, this in vi tro binding was found to depend on interaction of the region within MACHjSl modules. Figs. 9A and 9B show the results (autoradiograms) of the in vi tro interaction of MACHSl and its deletion mutants with MORT-l. Briefly, 35 [S] metabolically labeled MACHjSl, MACH/31 fused at its N-terminus to the FLAG octapeptide (FLAG-MACH/3D , C-terminus truncation mutantε of FLAG-MACHjSl, and, as a control, luciferase, were produced in transfected HeLa cells. Expression was done using a tetracycline-controlled expression vector, in a HeLa cell clone (HtTA-1) that expresses a tetracycline-controlled transactivator. Fig. 9A shows the assessment of the expression of the proteins and their molecular sizes by immunoprecipitation from cell lysates, using anti-FLAG antibody. The antibodies used are aε follows: Rabbit anti-MACHβl and anti-MORTl antisera were raised against GST-MACHjSl and GST-M0RT1 fusion proteins. Mouse monoclonal antibodieε against the FLAG octapeptide (M2) and against FAS/APOl (CH11, Yonehara et al. , 1989) were purchased from Eastman Kodak and Oncor (Gaithersburg, MD) respectively. Mouεe monoclonal anti-HA epitope antibody (12CA5, Field et al. , 1988) and anti-TNF antibody were produced in our laboratory according to the usual methods well known in the art. Fig. 9B shows affinity binding of the proteins to GST-MORT-1, adsorbed to glutathione-agarose beads (or, as a control, to GST or GST- fused to the intracellular domain of Fas-APOl) . Fig. 9C shows the resultε of the immuno-precipitations of the various MORT-l and MACH fusion constructε uεing the variouε specific antibodies. (b) MACH occurs in multi-pie isoforms; Northern analyεis using MACHjSl cDNA as a probe revealed low abundant transcript (ε) of approximately 3 kb in size in several different cell lines. Briefly, Northern blot analysis of total RNA (14 μg/lane) or poly A + RNA (2 μg) from several cell lines, using MACH/31 cDNA as probe was performed. The cell lines examined, T47D, CEM, Raji, Da di, HeLa, Alexander, Jurkat and A673, are all of human origin and were derived from a ductal carcinoma of the breast, an acute lymphoblastic T cell leukemia, a Burkitt lymphoma, a Burkitt lymphoma, an epitheloid carcinoma, a human hepatoma, an acute T cell leukemia and a rhabdomyosarcoma, respectively. The rather diffuse shape of the hybridizing band on Northern blots εuggeεted that theεe tranεcriptε are of heterogeneous sizeε ranging between 2.85 and 3.5 Kb. Both the amounts and the sizes of the transcriptε varied among different human tiεεueε and were not correlated with the expression of MORT1 (Chinnaiyan et al. , 1995) or of FAS/APOl (Watanabe et al. , 1992) . cDNA prbes were radiolabeled with the random-prime kit (Boehringer Mannheim) and applied for analyεiε of human multiple tissue blots (Clontech) according to the manufacturer's instructions. In the testis and skeletal muεcle, for example, MACH tranεcripts were barely detectable, even though these tissues expresε εignificant amounts of MORT1. Converεely, resting peripheral blood mononuclear leukocytes, in which M0RT1 expression is very low, were found to expresε MACH at high levels. Lectin activation of the leukocytes results in a marked change in the size pattern of MACH transcripts, along with an induction of MORT-l. Exploring the nature of this size heterogeneity, cDNA libraries were screened for transcripts that hybridize with the MACHjSl cDNA probe. MACHαl and MACHα2 were cloned from a Charon BS cDNA library derived from the mRNA of human thymus. The library was screened under stringent conditions with a MACHSl cDNA probe, labeled using a random-priming kit (Boehringer Mannheim) . The other MACH isoforms were cloned by RT-PCR, performed on total RNA from Raji (MACHαl, α2, α3, ,33, j84 and jS5) and Daudi (MACHα2, β2 , β3 , β4 , and 05) human lymphoblaεtoid cells. Reverse transcriptase reaction was performed with an oligo-dT adapter primer (5 1 - GACTCGAGTCTAGAGTCGAC(T) j7 -3' ; SEQ ID NO:26) and the Superscript II reverse transcriptase (GIBCO-BRL) , used according to the manufacturer's instructionε. The first round of PCR was performed with the Expand Long Template PCR System (Boehringer Mannheim) using the following sense and antisense primers: 5'- AAGTGAGCAGATCAGAATTGAG-3 ' , corresponding to nucleotides 530- 551 of the MACH/31 cDNA (SEQ ID NO:4), and 5'-GACTCGAGTCTAGAGTCGAC-3' (SEQ ID NO:27), respectively. The second round was performed with Vent polymerase (NEB) using the following sense and antisenεe nested primers: 5 'GAGGATCCCCAAATGCAAACTGGATGATGAC-3 ' (SEQ ID NO:28) and 5 ' -GCCACCAGCTAAAAACATTCTCAA-3 ' , (correεponding to nucleotides 962-939 of SEQ ID NO:4) of MACHjSl cDNA, respectively. To confirm that MACH/33 and MACH/34 have initiation codons, a more 5' sequence of theεe isoforms from the RNA of Raji cells was cloned. The RT-PCR reaction, performed using the oligo-dT adapter primer as described above, was followed by two rounds of PCR (with Vent polymerase (NEB) ) using the following sense and antisense oligonucleotides: 5 ' -TTGGATCCAGATGGACTTCAGCAGAAATCTT-3 ' (SEQ ID NO:29) and 5'- ATTCTCAAACCCTGCATCCAAGTG-3 ' (corresponding to nucleotideε 946- 923 of SEQ ID NO:4) in MACHβl. The latter oligonucleotide is specific to the jS-isoforms. Among the clones obtained in this way, those found to contain the nucleotides encoding for the amino acids of 'block 2' (whose presence distinguishes MACH03 and MACH34 from MACH31 and MACH32 as discussed below) were fully sequenced. Nucleotide sequences in all cloned isoformε were determined in both directions by the dideoxy-chain termination method. Only partial cDNA clones of MACHα3 and MACHJ2 were obtained. This screening revealed the existence of multiple isoforms of MACH. The amino acid sequences of eight of these isoforms were studied in detail. The results are illustrated diagrammatically in Fig. 12 and exemplified in Fig. 13 where the amino acid sequenceε of three of the isoforms are compared with known homologs. Fig. 10 shows a diagrammatic representation of the variouε MACH iεoforms. Coding regions are repreεented as boxed areas. The various domains within the coding regionε are denoted by different shadings as follows: the MORT modules (g) ,- the three amino acid sequence blocks which occur in different combinationε in the iεoformε. Poεitionε of the residues in the CED3/ICE homology region implicated in the catalytic activity of ICE based on its X-ray crystal structure are shown. The catalytic cysteine residue is also indicated by a star (★) . Those parts of the MACHαl nucleotide sequence that are misεing in the sequences of other isoformε are indicated in the diagramε of the latter iεoforms by V-shaped connecting lines. The lengths of these cDNA regions, which probably correspond to distinct exons, are indicated below the diagram of MACHαl. Lack of the 65 nucleotides which in MACHαl encode for 'block 2' causeε alteration in MACH31 and MACHjS2 of the reading frame of the nucleotideε that encode for 'block 3' . In those isoforms, therefore, these nucleotides encode other amino acids which together conεtitute their unique C- terminal region. On the other hand, in MACH/33 and MACH04 the reading frame of block 3 iε maintained, but absence of the nucleotides that encode the CED3/ICE region and part of the 3' noncoding region results in alteration of the reading frame of nucleotides further downstream. Because of this alteration, the most 5 ' part of this noncoding downstream region does encode 10 amino acids, which constitute the C-terminal region unique to theεe two iεoforms (hatched) . As indicated in the figure, only partial cDNA clones of MACHα3 and MACH/32 were obtained. The isoforms were cloned from a human B cell cDNA library (MACH/3D , from a human thymus cDNA library (MACHαl and α2) and from the mRNA of the human lymphoblastoid cells Raji (MACH2αl, α2, α3, j83, jS4, and β5) and Daudi (MACH 2, β2 , β3 , 04, and β5 ) . Cloning from the mRNA of the Raji and Daudi cells waε done by RT-PCR, using oligonucleotides corresponding to a 3 ' noncoding region and to a sequence within the second MORT module in MACHjSl. The starting codon of clones isolated in that way is therefore located within the second MORT module. The cDNA sequence and amino acid sequence of the MACH isoforms are presented in the sequence listing and identified as follows in Table 4. TABLE 4 MACH isoform cDNA Sequence Amino Acid Sequence MACHαl SEQ ID NO:14 SEQ ID NO:7 MACHα2 SEQ ID NO:17 SEQ ID NO:18 MACHα3 SEQ ID NO:19 SEQ ID NO:20 MACHjSl SEQ ID NO:4 SEQ ID NO:5 MACHj82 SEQ ID NO:21 SEQ ID NO:22 MACHj83 SEQ ID NO:23 SEQ ID NO:8 MACH04 SEQ ID NO:24 SEQ ID NO:25 MACH05 SEQ ID NO:33 SEQ ID NO:34 The sequences in the different isoforms relate to each other as follows: (a) All the MACH isoforms share a common 182-amino acid N-terminal region which encompasεeε the MORT modules, yet vary carboxy terminally (3* downstream) to these modules, as well as in their noncoding regions. (b) On the basiε of their C terminal sequences, the isoformε fall into two εubgroupε: four iεoformε defined aε εubgroup jS, have different C-termini due to alteration in the reading frame. Two (MACHjSl AND 02) share the C-terminus found in the isoform initially cloned in the two-hybrid screen and two (MACH03 and 04) share a different C-terminus; three isoformε, defined aε subgroup α, have a much longer C-terminal region that closely resemble proteaseε of the CED3/ICE family (see below) ; (c) The regions extending between the MORT module region and the C terminal region that defines the subgroups varied from one isoform to another. However, close examination showed that these intermediate regions consiεt of different combinations of the same three amino acid sequence blocks (blocks 1, 2 and 3) . The variations of amino acid sequence among the different clones reflect two kinds of variations in nucleotide sequence, that most likely occur by alternative splicing: (a) insertion or absence of either of two nucleotide sequences, one of 45 nucleotides (nts) and the other of 65 ntε, or of both, below the nucleotides encoding Lysl84; (b) preεence of an additional insert within the region which in MACH01 constituteε the 3 ' noncoding part . These variations affect both the reading frame and the length of the protein. Part of the MACH isoforms encompasε a CED3/ICE homolog. Data bank εearch revealed that the C terminal region of MACHα iεoforms including block 3 and the sequence extending downstream of it, closely resemble proteaseε of the CED3/ICE family. Fig. 11 preεentε εequence comparison of this region in MACH and the various known human members of this family as well as the Caenorhabdi tis elegans ced3 protein. CED3 (Ellis and Horvitz, 1986; Yuan et al. , 1993) , and the known human proteases of the CED3/ICE protease family: CPP32 (Fernandes- Alnemri et al. , 1994), also called apopain (Nicholεon et al. , 1995) and Yama (Tewari et al. , 1995b), Mch2α (Fernandes- Alnemri et al. , 1995), Ich-1 (Wang et al. , 1994; the human homolog of the mouse Nedd2 protein, Kumar et al. , 1994), ICE re ,II (Munday et al. , 1995), ICE re ,II (Munday et al. , 1995), also called TX and Ich2 (Faucheu et al. , 1995; Kamens et al. , 1995), and ICE (Thornberry et al. , 1992; Cerretti et al. , 1992) . Fig. 11 depicts schematically the colinear amino acid sequence alignment of the MACH isoforms and the various known members for the CED/ICE protease family. Shown are the amino acid sequences of MACHαl, MACH01, MACH03 as well as of the Caenorhabdi tis elegans protease CED3, and of the known human proteases of the CED3/ICE protease family. The above C-terminal region of MACH most closely resembleε CPP32 (with 41% identity and 62% homology) and CED3 (with 34% identity and 56% homology) . It εhows a significantly leεεer similarity to ICE (with 28% identity an 50% homology) and to its closely related homologs ICE re ,II (also called TX and Ich2) and ICE rel III. The similarity was observed throughout almost the whole region starting from Tyr226 within block 3, to the C terminus of the MACHα isoforms. Two points of similarity are particularly notable: (a) All known proteases of the CED3/ICE family cleave proteins at sites defined by the occurrence of Asp at the Pl position and a small hydrophobic amino acid residue at Pl' . Their specificity differs, though, with regard to other structural features of the substrate, including the nature of the residues at positions P2-P4. Accordingly, the active site residues involved in catalysis (corresponding to His237, Gly238 and Cys285 in ICE) and in the binding pocket for the carboxylate side chain of the Pl Asp (Argl79, Gln283, Arg341 and probably also Ser347) are conserved among these proteases. As shown in Fig. 11, these residues (marked by shading of the residues and by full and empty circles below the sequences) are also conserved in MACHαl. There is one exception, though - a conservative change of Ser to Thr at the site correεponding to Ser347 of ICE. Another slight, yet potentially important, sequence difference between MACHα isoforms and other members of the protease family is an Arg to Gin replacement of the residue corresponding to Arg286 of ICE. This residue, which is adjacent to the putative catalytic cysteine residue, is fully conserved in all other CED3/ICE family members . Also part of the residues at the siteε located cloεe to the εubεtrate P2-P4 reεidueε (marked by triangleε below the sequences in Fig. 11) differ in the MACHα isoforms from those found in other CED3/ICE family members, (b) Proteases of the CED3/ICE family contain sites of autocleavage. Several of the proteases are known indeed to be self-proceεsed, and to depend on this processing for displaying maximal catalytic activity. Their fully bioactive form is compoεed of two noncovalently-aεεociated cleavage products, which differ in size (p20 and pl7 in ICE; pl7 and pl2 in CPP32, as marked by arrowε in Fig. 11) . Preεence of potential sites of autocleavage in other members of the family suggests that they are subject to similar procesεing, and, εimilarly, depend on this processing for exhibiting maximal activity. Such potential εiteε of autocleavage occur in MACHαl almoεt at the εame locationε aε in the CPP32 (εee shaded boxes in Fig. 11) . The site corresponding to the N terminus of the pl7 εubunit of CPP32 is located in the second conserved block of amino acids, just a few amino acids upstream to the N terminus of the CED3/ICE-homology region (below Asp216) . The site corresponding to the point of cleavage between the two subunits of CPP32 is located, as in all other members of the CED3/ICE family that are known to be cleaved, a few amino acids downstream to the catalytic cysteine residue (below Aεp374) . Thiε conεervation suggests that the CED3/ICE homology region in MACHαl is subject to proteolytic procesεing. The εizes of the two expected products of this cleavage are very close to that of the two subunits of the procesεed CPP32 molecule, (c) The CED3/ICE homolocrv reσion in MACH has proteolytic activity. To find out if the CED3/ICE homology region in MACHα possesses proteolytic activity, applicants expresεed the region that extends from the potential cleavage site upstream to this region, between Asp216 and Ser217, till the C terminuε of the protein in bacteria, aε a GST fuεion protein. The bacterial lysates were examined for ability to cleave fluorogenic peptide substrates, shown before to be cleaved by other CED3/ICE homologs. Two subεtrate peptideε were uεed: The firεt, Acetyl-Asp-Glu-Val-Aεp-a- (4-Methyl-Coumaryl-7- Amide) (AC-DEVD-AMC) , correεpondε to a εequence in poly (ADP- ribose) polymerase (PARP) , a nuclear protein found to be cleaved in cells εhortly after FAS-R stimulation (Tewari et al., 1995b) , as well as in other apoptopic proceεεeε (Kaufmann, 1989; Kaufmann et al. 1993; Lazebnik et al. , 1994) . Thiε fluorogenic substrate is cleaved effectively by CPP32. The second fluorogenic εubstrate, Acetyl-Tyr-Val-Ala-Asp-AMC (Ac-YVAD-AMC) , correεponds to a subεtrate site for ICE in the IL-10 precursor. This fluorogenic subεtrate is cleaved by ICE. As εhown in Figε. 12A-F and 13A-B, lyεateε of bacteria expreεεing the CED3/ICE homology region in MACHαl cleaved effectively the PARP εequence-derived fluorogenic εubεtrate. They had no meaεurable proteolytic activity, though, againεt the IL-10-precursor sequence-derived fluorogenic substrate (controls) , Ac-YVAD-AMC, which is an ICE cleavage site in IL-10 precursor (Thornberry et al. , 1992) . The proteolytic activity was blocked by iodacetic acid (5 mM) , confirming that it is mediated by a thiol protease. No cleavage was observed with lysates containing the GST-fused MACH CED3/ICE-homology region in which the catalytic cysteine residue Cys 360 was replaced by Ser. Also, lysates from bacteria that expressed the full-length MACHαl protein as a GST-fusion protein did not cleave Ac-DEVD-AMC, probably because of the absence of bacterial enzymes capable of processing the full-length molecule. Nor did cleavage occur with lysates containing either of the two potential cleavage products of the CED3/ICE homology region. Figs. 12A-F and 13A show the kinetics of cleavage of the PARP sequence-derived fluorogenic substrate, Ac-DEVD-AMC (50μM) , by extracts of E. coli expressing a GST-fusion protein of the CED3/ICE homology region in MACHαl (Ser217 through the C-terminus of the protein) as compared to the lack of cleavage by extracts of bacteria expresεing GST-fuεion proteinε of the full-length MACHαl molecule or of either one of the two potential proteolytic productε of the CED3/ICE homology region (Ser217 till Aεp374 and Aεp374 through the C-terminuε of the protein) . It alεo εhows the substrate concentration-dependence of the cleavage of Ac-DEVD-AMC, incubated for 180 min. with extracts of bacteria expressing the MACHαl CED3/ICE homology- region in fusion with GST (see Fig. 13B) . No cleavage was observed in the presence of iodoacetic acid (5mM) . The extracts had no activity on Ac-YVAD-AMC, a fluorogenic substrate corresponding to a substrate site for ICE in the IL- 10 precursor. Briefly, the GST-fuεion proteinε were produced in XLl-blue bacteria using the pGEX3 expression vector. The bacteria were lysed by sonication in a buffer containing 25mM HEPES (pH 7.5), 0.1% 3- [3-cholamidopropyl) dimethylamino] -1- propaneεulfonate, 5mM EDTA and 2mM DDT, followed by centrifugation at 16,000Xg for 10 min. SDS-PAGE analysiε confirmed the preεence of εimilar levels of the various fusion proteins in the lysateε (not εhown) . 50 μl aliquots of the extracts (4 mg/ml of total protein) were incubated at room temperature for the indicated periods in a 500 μl total volume reaction with the fluorogenic substrates, at the indicated concentrations. AMC release was measured by spectro- fluorometry at an excitation wavelength of 380 nm and an emiεεion wavelength of 460 nm. The concentration of AMC was determined from a standard curve. Both fluorogenic substrate peptides were obtained from Peptide Institute Inc. (Osaka, Japan) . Other CED3/ICE proteases were shown to exhibit full activity only after proteolytic procesεing, which occurs either by self-cleavage, or via their cleavage by other proteases (reviewed in Kumar, 1995; Henkart, 1996) . Applicants' observation that lysates of bacteria that express GST-MACHαl molecules do not posεess enzymatic activity, as opposed to the activity observed in lysates of bacteria that expresε the CED3/ICE homology region, εuggests that processing is also required for MACHα activity. The way in which MACHα ' procesεing occurs within the mammalian cell, and how this processing is brought about by FAS-R or p55-R triggering, iε not known. MORT-l haε been εhown to bind in cellε to acitivated FAS-R together with εome other proteins (Kiεchkel et al. , 1995) . Theεe proteins are likely to include MACHαl and other MACH iεoformε. It seems plausible that the binding of MORT-l in association with MACHα to FAS-R brings together several MACH moleculeε, or induceε conformational changes in them, and that these changes either trigger autolytic procesεing of MACHα or make MACHα εuεceptible to cleabage by other proteaεeε. Stimulation of p55-R may trigger self- proceεεing of MACHα in a εimilar, though leεε direct manner, by brining together several TRADD molecules, or inducing a conformational change in them, which in turn induces a change in the vormation or state of aggregation of MORT-l and its asεociated MACH molecule. The substrate specificity of MACHα seems to be rather 'death oriented' . Although it could cleave a substrate peptide corrsponding to a cleavage site in the death substrate PARP (Ac-DEVD-AMC) , MACHα showed no proteolytic activity towardε a peptide corresponding to the site of procesεing of the IL-10 precursor by ICE (Ac-YVAD-AMC) . Identification of the cellular proteins that serve as substrates for cleavage by MACHα will elucidate the more downstream events in death induction by this protease. Likely substrates for MACHα cleavage are other members of the CED3/ICE family, like CPP32 and ICE. Some of these proteaseε are indeed processed after FAS-R or TNF receptor-triggering (Miura et al. , 1995; Schlegel et al, 1996; Chinnaiyan et al. , 1996) . Perhaps proteases that do not belong the CED3/ICE family are also activate by MACHα, either directly or through the action of other CED3/ICE proteases. Involvement of multiple proteases in the cell death process is conεistent with the reported ability of inhibitors of various proteases, including inhibitors of serine proteases and an inhibitor of ICE cleavage as well as antisense ICE cDNA, to protect cells from FAS-R and TNF receptor-induced toxicity (Weitzen and Granger, 1980; Ruggiero et al., 1987; Enari et al., 1995; Los et al. , 1995) . A variety of other enzymes, including phospholipases, sphingomyelinases and protein kinaεes, may participate in cell death induciton by the TNF receptors and FAS-R (see Eischen et al. , 1994; Vandenabeele et al. , 1995; Cifone et al. , 1995 and references therein) . Some of these enzymes may become activated by the proteolytic cleavage initiated by MACHα. It alεo seems possible, however, that at least part of these other death-related activitieε are εtimulated by distinct signaling routeε, independently of MACHα stimulation. Involvement of more than one signaling cascade in the induction of cell death, some common to p55-R and Fas/APOl and some induced by only one of them, would be consistent with report on both shared and distinct features of cell death processes induced by the two receptors (Grell et al., 1994; Schulze-Osthoff et al. , 1994; Wong and Goeddel, 1994; Clement and Stamenkovic, 1994) . (d) MACHαl binds to MORT1 as well as to MACHfll; To find out if MACHαl can bind to MORT1, as does MACH01, the interaction of the proteins within transfected yeasts was first examined. MACHαl appeared to have a significant cytotoxic effect on the yeasts. This effect was manifested in a marked decrease in the yield of colonies in yeasts that expressed the protein in the activation domain (AD) vector (whose expression level is higher than that of the DNA binding domain (DBD) vector) . On the other hand, MACH01 in which the catalytic cysteine residue, Cys 360 , was replaced with Ser (MACHαl (C360S) ) was not cytotoxic to either mammalian cells (see below), or yeast. Like MACH01, MACHαl (C36OS) bound in tranfected yeast to MORT-l and alεo to itεelf. It also bound to MACH01. Also, yeaεt expreεεing the wild-type MACHαl together with MORT-l or MACH01 exhibited interaction of the tranεfected proteinε. The intensity of the lacZ-product color varied, however, among the yeast colonies; in yeasts tranfected with MACHαl in both the AD and the DBD vectors no color product was obεerved, probably becauεe of the cytotoxic effect of the wild-type MACHαl. Yet, in εpite of this variation, yeasts expressing MACHαl either in combination with MORT1 or in combination with MACH01 scored clearly positive for interaction of the tranεfected proteins. Unlike MACH01, MACHαl did not exhibit self-interaction in the two hybrid test (Fig. 5) . Both MACHαl (C36OS) and MACH01 coimmunoprecipitated with MORT-l from lysates of human embryonic kidney 293-EBNA cells, indicating that they bind to MORT-l also in mammalian cells. Teεting further if MACHαl can bind to MORT1 also within mammalian cells, MACHαl or MACH01, fused with the FLAG octapeptide waε expressed, together with HA epitope-tagged MORT1 molecules. 35 [S] metabolically labeled MACHαl and MACH01 fused at their N-termini to the FLAG octapeptide (FLAG-MACHαl and 01) , and MORT1 fused at its N terminuε to the HA epitope (Field et al., 1988) were expreεεed in HeLa cells. Immunoprecipitation of the proteins from lysates of the cells was performed using mouse monoclonal antibodies against the FLAG octapeptide (M2; Eastman Kodak) , HA epitope (12CA5, Field et al., 1988) or the p75 TNF receptor (#9, Bigda et al. , 1994) as a control. The proteinε were analyzed by SDS- polyacrylamide gel electrophoresis (12% acrylamide) , followed by autoradiography. Both MACHαl and MACH01 co- immunoprecipitated with MORT1 from lysates of the cells, indicating that they bind to MORT1. The effectivity of interaction of MACHαl with MORT1 appeared to be lower than that of MACH01. (e) MACH molecules that contain the CED3/ICE homolocry region can mediate cell death; To explore the involvement of MACH in cell-death induction, the effect of overexpression of various MACH isoforms on cell viability was examined. The test was performed by transfecting MACH expression vectors together with a 0-galactosidase expression vector as a transfection marker into human embryonic kidney 293-EBNA cells and breast carcinoma MCF7 cells. In brief, 293-EBNA cells, MCF7 human breast carcinoma cells and HeLa HtTA-1 cells were grown in Dulbecco's modified Eagle's minimal essential medium supplemented with 10% fetal calf serum, nonessential amino acids, 100 U/ml penicillin and 100 μg/ml streptomycin. Cell tissue culture dishes (5xl0 5 293-EBNA cells, 3xl0 5 MCF7 cellε or 3xl0 5 HeLa cells in 6-cm dishes) were transiently transfected, using the calcium phosphate precipitation method, with the cDNAs of the indicated proteins together with the 0-galactosidase expression vector. In the experiments preεented in Figε. 14A-D and 15, each dish waε transfected with 3.5 μg of the indicated MACH construct and 1.5 μg of pSV-0-gal. In the experiments presented in Figureε 16A-D and 17-19, each dish was transfected with 2.5 μg of the indicated MACH or MORT1 construct (or, as control, empty vector) and 1.5 μg of pSV-0- gal. The cells were rinsed 6 to 10 h after transfection. The 293-EBNA and MCF7 cells were incubated for a further 18 h without additional treatment. The HeLa cells were incubated for 26 h after transfection and then for 5 h in the preεence of either anti-Fas.APOl antibody (CHll, 0.5 μg/ml) or TNF (100 ng/ml) , together with cycloheximide (10 μg/ml) . The extent of cell death at the end of the incubation periods was assessed by determination of 0-galactosidase expression, as described by Kumar et al. , 1994. Cultures transfected with an expresεion vector of either MACHαl or MACHα2 exhibited maεsive cell death, manifested by cell rounding, blebbing, contraction, and finally detachment of cells from the dish (Fig. 14B) . By 20h after transfection, the majority of the transfected cells, identified by 0-galactosidase staining (X-Gal) , showed condensed morphology typical of apoptosis (Figure 14B) . In contrast, cells expreεsing the empty vector remained viable. In particular, Figs. 14A-D εhow the morphology of human embryonic kidney 293-EBNA cells transiently expressing the indicated MACH isoforms. The arrows (Fig. 14B) point to apoptopic cells. Photographs were taken 26 h after transfection. Fig. 15 shows the quantification of MACH- induced death of the 293-EBNA (striped squares) and MCF7 (black squares) cells by determination of the portion of 0- galactosidase-expressing cells exhibiting apoptopic morphology 20 h after transfection of the indicated constructε. Data are from three independent experi entε with the 293-EBNA cellε and two independent experimentε with the MCF7 cellε. They are expressed as the mean percentage of the blue cells exhibiting signs of apoptosis as a fraction of the total number of blue cells counted (about 500 cells per sample) . To examine the involvement of the CED3/ICE homology region within the MACHα isoformε in their apoptopic effectε, cells were transfected with the expreεsion vector for the MACH01 isoform, which lacks the CED3/ICE homology region, as well as with expression vectors for MACHα3, which lacks an N- terminal part of the region, and with expression vectors for MACHαl (C360S) and for a C-terminally truncated mutant of MACHαl (MACHαl (1-415) ) , which lacks one of the residues believed to be critical for CED3/ICE protease function (corresponding to Ser^ in ICE) . No death (beyond the slight amount observed in cells transfected with an empty expression vector) occurred in 293-EBNA or MCF7 cells transfected with the expression vectors for MACH 3, MACHαl (1-415) or MACHαl (C360S) . Moreover, cells transfected with MACHαl together with these vectors also exhibited very little cell death, indicating that MACH moleculeε that contain an incomplete CED3/ICE region have a negative dominant effect on the activity of the wild-type molecules. Cultures expresεing MACH01, which doeε not contain the CED3/ICE region at all, did exhibit some slight cell death (Figure 15) . This effect of MACH01, which most probably results from activation of endogenous MACHαl molecules, waε for some reason more pronounced in transfected HeLa cells. Moreover, in HeLa cells MACHα3, MACHαl (1-415) and MACHαl (C360S) were also somewhat cytotoxic (Figure 19) . Figure 8 diagrammatically presents the receptor and target protein interactions participating in induction of cell death by FAS/APOl (FAS-R) and p55-R. MACHα activity appears to constitute the most upstream enzymatic step in the cascade of signalling for the cytocidal effects of FAS/APOl and p55-R. The ability of MACH01 to bind to both MORT-l and MACHαl suggests that this isoform enhances the activity of the enzymatically active isoforms. It is possible that some of the MACH isoforms εerve additional funcitonε. The ability of MACH01 to bind to both MORT-l and MACHαl suggests that this isoform might enhane the acitivity of the enzymatically acitive isoformε. The mild cytoxicity observed in 293-EBNA and MCF7 cultures transfected with this isoform and the rather significant cytoxic effect that it exerts in HeLa cells probably reflect activation of endogenously expresεed MACHα moleucles upon binding to the transfected MACH01 molecules. Conceivably, some of the MACH isoforms could also act as docking sites for molecules that are involved in other, non-cytoxic effects of Fas/APOl and TNF receptors. (f) Blocking of MACHα function interferes with cell death induction by Fas/APOl and p55-R To assess the contribution of MACHα to Fas/APOl (FAS-R) and p55-R cytotoxicity, MACHα3, as well as the nonfunctional MACHαl mutants, MACHαl (1-415) and MACHα (C360S) , were expressed in cells that were induced to exhibit this cytotoxicity. p55-R-induced cytotoxicity was triggered in the 293-EBNA cells by transient over-expression of this receptor (Boldin et al . , 1995a) , and Fas/APOl cytotoxicity by over- expression of chimeric molecules comprised of the extracellular domain of the p55-R and the transmembrane and intracellular domains of Fas/APOl. For some reason, this chimera had a far greater cytotoxic effect than that of the normal Fas/APOl. Cytotoxic activities in HeLa cells was also induced by treating them with TNF or anti-Fas/APOl antibody in the preεence of the protein-εyntheεis blocker cycloheximide. The HeLa cells were made responsive to Fas/APOl by transient expression of this receptor. In all systems examined, MACHα3 and the nonfunctional MACHαl mutants provided effective protection against the cytotoxicity induced by Fas/APOl or p55-R triggering (Figures 16-19) . Such protection was alεo obεerved, as previously reported (Hsu et al., 1996; Chinnaiyan et al., 1996), in cells transfected with a MORT1 N-terminal deletion mutant that lackε the MACH-binding region (M0RT1(92- 208) ) . These protective effects indicate that MACHα is a necessary component of both the Fas/APOl- and the p55-R- induced εignaling cascades for cell death. In particular, Figs. 16A-D εhow morphology of 293- EBNA cells in which cell death was induced by tranεient expreεsion of a chimera comprised of the extracellular domain of the p55-R (amino acids 1-168) fused to the transmembrane and intracellular domains of Fas/APOl (amino acids 153-319) (p55-Fas chimera) (Figε. 16A and 16B) , or by expression of the p55-R (Figs. 16C and 16D) , and of cellε that were protected from theεe cytotoxic effects by their simultaneous transfection with MACHαl (C36OS) (Figs. 16B and 16D) . Photographs were taken 26 h after tranεfection. Fig. 17 illustrates the quantification of death induced in 293-EBNA cells by their transfection with p55-Faε chimera or with p55- R, together with an empty vector, a MORT1 deletion mutant lacking the MACH-binding region (MORT1 (92-208) ) , or MACHα moleculeε containing a nonfunctional CED3/ICE region. Fig. 18 εhowε the death of HeLa cellε that transiently express Fas/APOl, induced by treatment with anti-Faε/APOl antibody (aFas) and cycloheximide (CHI) , and itε prevention by cotranεfection of MORT1DD(92-208) , MACHα(C360S) or MACHα3. Fig. 19 shows the death of HeLa cells induced by application of TNF and cycloheximide (CHI) , and its prevention as in Fig. 18. Data are from at least two independent experiments and are expressed as in Figures 14A-F and 15. MACH is expressed in different tissues at markedly different levels and apparently also with different isotype patterns. These differences probably contribute to the tissue-specific features of response to the Fas/APOl ligand and TNF. As in the case of other CED3/ICE homologs (Wang et al., 1994; Alnemri et al. , 1995) , MACH isoforms containing incomplete CED3/ICE regions (e.g. MACHα3) are found to inhibit the activities of coexpressed MACHαl or MACHα2 molecules; they are also found to block death induction by Fas/APOl and p55-R. Expression of such inhibitory isoforms in cells may constitute a mechanism of cellular self-protection against Fas/APOl- and TNF-mediated cytotoxicity. The wide heterogeneity of MACH isoforms, which greatly exceeds that observed for any of the other proteases of th CED3/ICE family, should allow a particulary fine tuning of the function of the active MACH isoforms. Having now fully described this invention, it will be appreciated by those skilled in the art that the same can be performed within a wide range of equivalent parameters, concentrations, and conditions without departing from the spirit and scope of the invention and without undue experimentation. While this invention haε been deεcribed in connection with specific embodiments thereof, it will be understood that it is capable of further modifications. This application is intended to cover any variations, uses, or adaptations of the inventionε following, in general, the principleε of the invention and including εuch departureε from the present disclosure as come within known or customary practice within the art to which the invention pertains and as may be applied to the essential features hereinbefore set forth as follows in the εcope of the appended claims. All references cited herein, including journal articles or abstracts, published or corresponding U.S. or foreign patent applications, issued U.S. or foreign patents, or any other references, are entirely incorporated by reference herein, including all data, tables, figures, and text presented in the cited references. Additionally, the entire contents of the references cited within the referenceε cited herein are also entirely incorporated by reference. Reference to known method steps, conventional methods stepε, known methods or conventional methods is not in any way an admission that any aspect, description or embodiment of the present invention is disclosed, taught or suggested in the relevant art. The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying knowledge within the skill of the art (including the contents of the references cited herein) , readily modify and/or adapt for various applications such specific embodiments, without undue experimentation, without departing from the general concept of the present invention. Therefore, such adaptations and modifications are intended to be within the meaning and range of equivalentε of the diεcloεed embodiments, based on the teaching and guidance presented herein. 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Yuan, J. et al. (1993) Cell 75:641-652. Zaccharia, S. et al. (1991) Eur. J. Pharmacol. 203 . :353-357. Zhao, J.J. and Pick, L. (1993) Nature (England) 365:448-51. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: (A) NAME: YEDA RESEARCH AND DEVELOPMENT CO. LTD. at the Weizmann Institute of Science (B) STREET: P.O. Box 95 (C) CITY: Rehovot (E) COUNTRY: Israel (F) POSTAL CODE (ZIP) : 76100 (G) TELEPHONE: 011-972-847-0617 (H) TELEFAX: 011-972-847-0733 (A NAME: David WALLACH (B STREET: 24 Borochov Street (C CITY: Rehovot (E COUNTRY: Israel (F POSTAL CODE (ZIP) : 76406 (G TELEPHONE: 011-972-8946-3302 (A NAME: Mark P. BOLDIN (B STREET: Weizmann Institute of Science, Beit Clore 303 (C CITY: Rehovot (D STATE: (E COUNTRY: Israel (F POSTAL CODE (ZIP) : 76000 (A NAME: Tanya M. GONCHAROV (B STREET: Derekh Yavne 17-15 (c: CITY: Rehovot (D STATE: (E COUNTRY: Israel (F POSTAL CODE (ZIP) : 76000 (A NAME: Yury V. GOLTSEV (B STREET: Weizmann Institute of Science, Beit Clore 402 (C CITY: Rehovot (D STATE: (E COUNTRY: Israel (F POSTAL CODE (ZIP) : 76000 ( NAME: Henry WEINWURZEL (B STREET: Herzl Street 43 (C CITY: Raanana (E COUNTRY: Israel (F POSTAL CODE (ZIP) : 43353 (ii) TITLE OF INVENTION: MODULATORS OF THE FUNCTION OF FAS RECEPTORS AND OTHER PROTEINS (iii) NUMBER OF SEQUENCES: 34 (iv) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: Patentin Release #1.0, Version #1.30 (EPO) (vi) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: IL 114,615 (B) FILING DATE: 16-JUL-1995 (vi) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: IL 114,986 (B) FILING DATE: 17-AUG-1995 (vi) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: IL 115,319 (B) FILING DATE: 14-SEP-1995 (vi) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: IL 116,588 (B) FILING DATE: 27-DEC-1995 (vi) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: IL 117,932 (B) FILING DATE: 16-APR-1996 (2) INFORMATION FOR SEQ ID NO: 1: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1701 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION:!..768 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 1: GTG AAT CAG GCA CCG GAG TGC AGG TTC GGG GGT GGA ATC CTT GGG CCG 48 Val Asn Gin Ala Pro Glu Cys Arg Phe Gly Gly Gly lie Leu Gly Pro 1 5 10 15 CTG GGC AAG CGG CGA GAC CTG GCC AGG GCC AGC GAG CCG AGG ACA GAG 96 Leu Gly Lys Arg Arg Asp Leu Ala Arg Ala Ser Glu Pro Arg Thr Glu 20 25 30 GGC GCG CGG AGG GCC GGG CCG CAG CCC CGG CCG CTT GCA GAC CCC GCC 144 Gly Ala Arg Arg Ala Gly Pro Gin Pro Arg Pro Leu Ala Asp Pro Ala 35 40 45 ATG GAC CCG TTC CTG GTG CTG CTG CAC TCG GTG TCG TCC AGC CTG TCG 192 Met Asp Pro Phe Leu Val Leu Leu His Ser Val Ser Ser Ser Leu Ser 50 55 60 AGC AGC GAG CTG ACC GAG CTC AAG TTC CTA TGC CTC GGG CGC GTG GTC 240 Ser Ser Glu Leu Thr Glu Leu Lys Phe Leu Cys Leu Gly Arg Val Val 65 70 75 80 AAG CGC AAG CTG GAG CGC GTG CAG AGC GGC CTA GAC CTC TTC TCC ATG 288 Lys Arg Lys Leu Glu Arg Val Gin Ser Gly Leu Asp Leu Phe Ser Met 85 90 95 CTG CTG GAG CAG AAC GAC CTG GAG CCC GGG CAC ACC GAG CTC CTG CGC 336 Leu Leu Glu Gin Asn Asp Leu Glu Pro Gly His Thr Glu Leu Leu Arg 100 105 110 GAG CTG CTC GCC TCC CTG CGG CGC CAC GAC CTG CTG CGG CGC GTC GAC 384 Glu Leu Leu Ala Ser Leu Arg Arg His Asp Leu Leu Arg Arg Val Asp 115 120 125 GAC TTC GAG GCG GGG GCG GCG GCC GGG GCC GCG CCT GGG GAA GAA GAC 432 Asp Phe Glu Ala Gly Ala Ala Ala Gly Ala Ala Pro Gly Glu Glu Asp 130 135 140 CTG TGT GCA GCA TTT AAC GTC ATA TGT GAT AAT GTG GGG AAA GAT TGG 480 Leu Cys Ala Ala Phe Asn Val lie Cys Asp Asn Val Gly Lys Asp Trp 145 150 155 160 AGA AGG CTG GCT CGT CAG CTC AAA GTC TCA GAC ACC AAG ATC GAC AGC 528 Arg Arg Leu Ala Arg Gin Leu Lys Val Ser Asp Thr Lys lie Asp Ser 165 170 175 ATC GAG GAC AGA TAC CCC CGC AAC CTG ACA GAG CGT GTG CGG GAG TCA 576 lie Glu Asp Arg Tyr Pro Arg Asn Leu Thr Glu Arg Val Arg Glu Ser 180 185 190 CTG AGA ATC TGG AAG AAC ACA GAG AAG GAG AAC GCA ACA GTG GCC CAC 624 Leu Arg lie Trp Lys Asn Thr Glu Lys Glu Asn Ala Thr Val Ala His 195 200 205 CTG GTG GGG GCT CTC AGG TCC TGC CAG ATG AAC CTG GTG GCT GAC CTG 672 Leu Val Gly Ala Leu Arg Ser Cys Gin Met Asn Leu Val Ala Asp Leu 210 215 220 GTA CAA GAG GTT CAG CAG GCC CGT GAC CTC CAG AAC AGG AGT GGG GCC 720 Val Gin Glu Val Gin Gin Ala Arg Asp Leu Gin Asn Arg Ser Gly Ala 225 230 235 240 ATG TCC CCG ATG TCA TGG AAC TCA GAC GCA TCT ACC TCC GAA GCG TCC 768 Met Ser Pro Met Ser Trp Asn Ser Asp Ala Ser Thr Ser Glu Ala Ser 245 250 255 TGATGGGCCG CTGCTTTGCG CTGGTGGACC ACAGGCATCT ACACAGCCTG GACTTTGGTT 828 CTCTCCAGGA AGGTAGCCCA GCACTGTGAA GACCCAGCAG GAAGCCAGGC TGAGTGAGCC 888 ACAGACCACC TGCTTCTGAA CTCAAGCTGC GTTTATTAAT GCCTCTCCCG CACCAGGCCG 948 GGCTTGGGCC CTGCACAGAT ATTTCCATTT CTTCCTCACT ATGACACTGA GCAAGATCTT 1008 GTCTCCACTA AATGAGCTCC TGCGGGAGTA GTTGGAAAGT TGGAACCGTG TCCAGCACAG 1068 AAGGAATCTG TGCAGATGAG CAGTCACACT GTTACTCCAC AGCGGAGGAG ACCAGCTCAG 1128 AGGCCCAGGA ATCGGAGCGA AGCAGAGAGG TGGAGAACTG GGATTTGAAC CCCCGCCATC 1188 CTTCACCAGA GCCCATGCTC AACCACTGTG GCGTTCTGCT GCCCCTGCAG TTGGCAGAAA 1248 GGATGTTTTT GTCCCATTTC CTTGGAGGCC ACCGGGACAG ACCTGGACAC TAGGGTCAGG 1308 CGGGGTGCTG TGGTGGGGAG AGGCATGGCT GGGGTGGGGG TGGGGAGACC TGGTTGGCCG 1368 TGGTCCAGCT CTTGGCCCCT GTGTGAGTTG AGTCTCCTCT CTGAGACTGC TAAGTAGGGG 1428 CAGTGATGGT TGCCAGGACG AATTGAGATA ATATCTGTGA GGTGCTGATG AGTGATTGAC 1488 ACACAGCACT CTCTAAATCT TCCTTGTGAG GATTATGGGT CCTGCAATTC TACAGTTTCT 1548 TACTGTTTTG TATCAAAATC ACTATCTTTC TGATAACAGA ATTGCCAAGG CAGCGGGATC 1608 TCGTATCTTT AAAAAGCAGT CCTCTTATTC CTAAGGTAAT CCTATTAAAA CACAGCTTTA 1668 CAACTTCCAT ATTACAAAAA AAAAAAAAAA AAA 1701 (2) INFORMATION FOR SEQ ID NO: 2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 256 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 2: Val Asn Gin Ala Pro Glu Cys Arg Phe Gly Gly Gly lie Leu Gly Pro 1 5 10 15 Leu Gly Lys Arg Arg Asp Leu Ala Arg Ala Ser Glu Pro Arg Thr Glu 20 25 30 Gly Ala Arg Arg Ala Gly Pro Gin Pro Arg Pro Leu Ala Asp Pro Ala 35 40 45 Met Asp Pro Phe Leu Val Leu Leu His Ser Val Ser Ser Ser Leu Ser 50 55 60 Ser Ser Glu Leu Thr Glu Leu Lys Phe Leu Cys Leu Gly Arg Val Val 65 70 75 80 Lys Arg Lys Leu Glu Arg Val Gin Ser Gly Leu Asp Leu Phe Ser Met 85 90 95 Leu Leu Glu Gin Asn Asp Leu Glu Pro Gly His Thr Glu Leu Leu Arg 100 105 110 Glu Leu Leu Ala Ser Leu Arg Arg His Asp Leu Leu Arg Arg Val Asp 115 120 125 Asp Phe Glu Ala Gly Ala Ala Ala Gly Ala Ala Pro Gly Glu Glu Asp 130 135 140 Leu Cys Ala Ala Phe Asn Val lie Cys Asp Asn Val Gly Lys Asp Trp 145 150 155 160 Arg Arg Leu Ala Arg Gin Leu Lys Val Ser Asp Thr Lys lie Asp Ser 165 170 175 lie Glu Asp Arg Tyr Pro Arg Asn Leu Thr Glu Arg Val Arg Glu Ser 180 185 190 Leu Arg lie Trp Lys Asn Thr Glu Lys Glu Asn Ala Thr Val Ala His 195 200 205 Leu Val Gly Ala Leu Arg Ser Cys Gin Met Asn Leu Val Ala Asp Leu 210 215 220 Val Gin Glu Val Gin Gin Ala Arg Asp Leu Gin Asn Arg Ser Gly Ala 225 230 235 240 Met Ser Pro Met Ser Trp Asn Ser Asp Ala Ser Thr Ser Glu Ala Ser 245 250 255 (2) INFORMATION FOR SEQ ID NO: 3: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 200 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: CDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 3: CCGCCGCCGC CGCCGCCACC TGCCCAGACT TTTCTGTTCC AGGGTCAGCC TGTAGTGAAT 60 CGGCCGCTGA GCCTGAAGGA CCAACAGACG TTCGCGCGCT CTGTGGGTCT CAAATGGCGC 120 AAGGTGGGGC GCTCACTGCA GCGAGGCTGC CGGGCGCTGC GGGACCCGGC GCTGGACTCG 180 CTGGCCTACG AGTACGAGCG 200 (2) INFORMATION FOR SEQ ID NO: 4: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1036 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 4: CGAGGCCACG AAGGCCGGCT GCCTGAGGAA TACCAGTGGG CAAGAGAATT AGCATTTCTG 60 GAGCATCTGC TGTCTGAGCA GCCCCTGGGT GCGTCCACTT TCTGGGCACG TGAGGTTGGG 120 CCTTGGCCGC CTGAGCCCTT GAGTTGGTCA CTTGAACCTT GGGAATATTG AGATTATATT 180 CTCCTGCCTT TTAAAAAGAT GGACTTCAGC AGAAATCTTT ATGATATTGG GGAACAACTG 240 GACAGTGAAG ATCTGGCCTC CCTCAAGTTC CTGAGCCTGG ACTACATTCC GCAAAGGAAG 300 CAAGAACCCA TCAAGGATGC CTTGATGTTA TTCCAGAGAC TCCAGGAAAA GAGAATGTTG 360 GAGGAAAGCA ATCTGTCCTT CCTGAAGGAG CTGCTCTTCC GAATTAATAG ACTGGATTTG 420 CTGATTACCT ACCTAAACAC TAGAAAGGAG GAGATGGAAA GGGAACTTCA GACACCAGGC 480 AGGGCTCAAA TTTCTGCCTA CAGGGTCATG CTCTATCAGA TTTCAGAAGA AGTGAGCAGA 540 TCAGAATTGA GGTCTTTTAA GTTTCTTTTG CAAGAGGAAA TCTCCAAATG CAAACTGGAT 600 GATGACATGA ACCTGCTGGA TATTTTCATA GAGATGGAGA AGAGGGTCAT CCTGGGAGAA 660 GGAAAGTTGG ACATCCTGAA AAGAGTCTGT GCCCAAATCA ACAAGAGCCT GCTGAAGATA 720 ATCAACGACT ATGAAGAATT CAGCAAAGAG AGAAGCAGCA GCCTTGAAGG AAGTCCTGAT 780 GAATTTTCAA ATGACTTTGG ACAAAGTTTA CCAAATGAAA AGCAAACCTC GGGGATACTG 840 TCTGATCATC AACAATCACA ATTTTGCAAA AGCACGGGAG AAAGTGCCCA AACTTCACAG 900 CATTAGGGAC AGGAATGGAA CACACTTGGA TGCAGGGTTT GAGAATGTTT TTAGCTGGTG 960 GCAATAAATA TTAGAAGCCT GCAGAATCCA GCTACGAATA TAGAGGGTTT TGCTCTTGGG 1020 CCTTCGTGGC CTCGAG 1036 (2) INFORMATION FOR SEQ ID NO: 5: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 235 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 5: Met Asp Phe Ser Arg Asn Leu Tyr Asp lie Gly Glu Gin Leu Asp Ser 1 5 10 15 Glu Asp Leu Ala Ser Leu Lys Phe Leu Ser Leu Asp Tyr lie Pro Gin 20 25 30 Arg Lys Gin Glu Pro lie Lys Asp Ala Leu Met Leu Phe Gin Arg Leu 35 40 45 Gin Glu Lys Arg Met Leu Glu Glu Ser Asn Leu Ser Phe Leu Lys Glu 50 55 60 Leu Leu Phe Arg lie Asn Arg Leu Asp Leu Leu lie Thr Tyr Leu Asn 65 70 75 80 Thr Arg Lys Glu Glu Met Glu Arg Glu Leu Gin Thr Pro Gly Arg Ala 85 90 95 Gin lie Ser Ala Tyr Arg Val Met Leu Tyr Gin lie Ser Glu Glu Val 100 105 110 Ser Arg Ser Glu Leu Arg Ser Phe Lys Phe Leu Leu Gin Glu Glu lie 115 120 125 Ser Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp lie Phe lie 130 135 140 Glu Met Glu Lys Arg Val lie Leu Gly Glu Gly Lys Leu Asp lie Leu 145 150 155 160 Lys Arg Val Cys Ala Gin lie Asn Lys Ser Leu Leu Lys lie lie Asn 165 170 175 Asp Tyr Glu Glu Phe Ser Lys Glu Arg Ser Ser Ser Leu Glu Gly Ser 180 185 190 Pro Asp Glu Phe Ser Asn Asp Phe Gly Gin Ser Leu Pro Asn Glu Lys 195 200 205 Gin Thr Ser Gly lie Leu Ser Asp His Gin Gin Ser Gin Phe Cys Lys 210 215 220 Ser Thr Gly Glu Ser Ala Gin Thr Ser Gin His 225 230 235 (2) INFORMATION FOR SEQ ID NO: 6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 78 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 6: Tyr Gly Thr Leu Phe Gin Asp Leu Thr Asn Asn lie Thr Leu Glu Asp 1 5 10 15 Leu Glu Gin Leu Lys Ser Ala Cys Lys Glu Asp lie Pro Ser Glu Lys 20 25 30 Ser Glu Glu lie Thr Thr Gly Ser Ala Trp Phe Ser Phe Leu Glu Ser 35 40 45 His Asn Lys Leu Asp Lys Asp Asn Leu Ser lie lie Glu His lie Phe 50 55 60 Glu He Ser Arg Arg Pro Asp Leu Leu Thr Met Val Val Asp 65 70 75 (2) INFORMATION FOR SEQ ID NO: 7: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 479 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE : protein (xi ) SEQUENCE DESCRIPTION : SEQ ID NO : 7 : Met Asp Phe Ser Arg Asn Leu Tyr Asp He Gly Glu Gin Leu Asp Ser 1 5 10 15 Glu Asp Leu Ala Ser Leu Lys Phe Leu Ser Leu Asp Tyr He Pro Gin 20 25 30 Arg Lys Gin Glu Pro He Lys Asp Ala Leu Met Leu Phe Gin Arg Leu 35 40 45 Gin Glu Lys Arg Met Leu Glu Glu Ser Asn Leu Ser Phe Leu Lys Glu 50 55 60 Leu Leu Phe Arg He Asn Arg Leu Asp Leu Leu He Thr Tyr Leu Asn 65 70 75 80 Thr Arg Lys Glu Glu Met Glu Arg Glu Leu Gin Thr Pro Gly Arg Ala 85 90 95 Gin He Ser Ala Tyr Arg Val Met Leu Tyr Gin He Ser Glu Glu Val 100 105 110 Ser Arg Ser Glu Leu Arg Ser Phe Lys Phe Leu Leu Gin Glu Glu He 115 * 120 125 Ser Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He 130 135 140 Glu Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu 145 150 155 160 Lys Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn 165 170 175 Asp Tyr Glu Glu Phe Ser Lys Glu Arg Ser Ser Ser Leu Glu Gly Ser 180 185 190 Pro Asp Glu Phe Ser Asn Gly Glu Glu Leu Cys Gly Val Met Thr He 195 200 205 Ser Asp Ser Pro Arg Glu Gin Asp Ser Glu Ser Gin Thr Leu Asp Lys 210 215 220 Val Tyr Gin Met Lys Ser Lys Pro Arg Gly Tyr Cys Leu He He Asn 225 230 235 240 Asn His Asn Phe Ala Lys Ala Arg Glu Lys Val Pro Lys Leu His Ser 245 250 255 He Arg Asp Arg Asn Gly Thr His Leu Asp Ala Gly Ala Leu Thr Thr 260 265 270 Thr Phe Glu Glu Leu His Phe Glu He Lys Pro His Asp Asp Cys Thr 275 280 285 Val Glu Gin He Tyr Glu He Leu Lys He Tyr Gin Leu Met Asp His 290 295 300 Ser Asn Met Asp Cys Phe He Cys Cys He Leu Ser His Gly Asp Lys 305 310 315 320 Gly He He Tyr Gly Thr Asp Gly Gin Glu Ala Pro He Tyr Glu Leu 325 330 335 Thr Ser Gin Phe Thr Gly Leu Lys Cys Pro Ser Leu Ala Gly Lys Pro 340 345 350 Lys Val Phe Phe He Gin Ala Cys Gin Gly Asp Asn Tyr Gin Lys Gly 355 360 365 He Pro Val Glu Thr Asp Ser Glu Glu Gin Pro Tyr Leu Glu Met Asp 370 375 380 Leu Ser Ser Pro Gin Thr Arg Tyr He Pro Asp Glu Ala Asp Phe Leu 385 390 395 400 Leu Gly Met Ala Thr Val Asn Asn Cys Val Ser Tyr Arg Asn Pro Ala 405 410 415 Glu Gly Thr Trp Tyr He Gin Ser Leu Cys Gin Ser Leu Arg Glu Arg 420 425 430 Cys Pro Arg Gly Asp Asp He Leu Thr He Leu Thr Glu Val Asn Tyr 435 440 445 Glu Val Ser Asn Lys Asp Asp Lys Lys Asn Met Gly Lys Gin Met Pro 450 455 460 Gin Pro Thr Phe Thr Leu Arg Lys Lys Leu Val Phe Pro Ser Asp 465 470 475 (2) INFORMATION FOR SEQ ID NO: 8: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 277 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 8: Met Asp Phe Ser Arg Asn Leu Tyr Asp He Gly Glu Gin Leu Asp Ser 1 5 10 15 Glu Asp Leu Ala Ser Leu Lys Phe Leu Ser Leu Asp Tyr He Pro Gin 20 25 30 Arg Lys Gin Glu Pro He Lys Asp Ala Leu Met Leu Phe Gin Arg Leu 35 40 45 Gin Glu Lys Arg Met Leu Glu Glu Ser Asn Leu Ser Phe Leu Lys Glu 50 55 60 Leu Leu Phe Arg He Asn Arg Leu Asp Leu Leu He Thr Tyr Leu Asn 65 70 75 80 Thr Arg Lys Glu Glu Met Glu Arg Glu Leu Gin Thr Pro Gly Arg Ala 85 90 95 Gin He Ser Ala Tyr Arg Val Met Leu Tyr Gin He Ser Glu Glu Val 100 105 110 Ser Arg Ser Glu Leu Arg Ser Phe Lys Phe Leu Leu Gin Glu Glu He 115 120 125 Ser Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He 130 135 140 Glu Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu 145 150 155 160 Lys Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn 165 170 175 Asp Tyr Glu Glu Phe Ser Lys Glu Arg Ser Ser Ser Leu Glu Gly Ser 180 185 190 Pro Asp Glu Phe Ser Asn Gly Glu Glu Leu Cys Gly Val Met Thr He 195 200 205 Ser Asp Ser Pro Arg Glu Gin Asp Ser Glu Ser Gin Thr Leu Asp Lys 210 215 220 Val Tyr Gin Met Lys Ser Lys Pro Arg Gly Tyr Cys Leu He He Asn 225 230 235 240 Asn His Asn Phe Ala Lys Ala Arg Glu Lys Val Pro Lys Leu His Ser 245 250 255 He Arg Asp Arg Asn Gly Thr His Leu Asp Ala Gly Phe Gly Asn Val 260 265 270 Phe Ser Trp Trp Gin 275 (2) INFORMATION FOR SEQ ID NO: 9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 489 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 9: Met Met Phe Ser Ser His Leu Lys Val Asp Glu He Leu Glu Val Leu 1 5 10 15 He Ala Lys Gin Val Leu Asn Ser Asp Asn Gly Asp Met He Asn Ser 20 25 30 Cys Gly Thr Val Arg Glu Lys Arg Arg Glu He Val Lys Ala Val Gin 35 40 45 Arg Arg Gly Asp Val Ala Phe Asp Ala Phe Tyr Asp Ala Leu Arg Ser 50 55 60 Thr Gly His Glu Gly Leu Ala Glu Val Leu Glu Pro Leu Ala Arg Ser 65 70 75 80 Val Asp Ser Asn Ala Val Glu Phe Glu Cys Pro Met Ser Pro Ala Ser 85 90 95 His Arg Arg Ser Arg Ala Leu Ser Pro Ala Gly Tyr Thr Ser Pro Thr 100 105 110 Arg Val His Arg Asp Ser Val Ser Ser Val Ser Ser Phe Thr Ser Tyr 115 120 125 Gin Asp He Tyr Ser Arg Ala Arg Ser Arg Ser Arg Ser Arg Ala Leu 130 135 140 His Ser Ser Asp Arg His Asn Tyr Ser Ser Pro Pro Val Asn Ala Phe 145 150 155 160 Pro Ser Gin Pro Ser Ser Ala Asn Ser Ser Phe Thr Gly Cys Ser Ser 165 170 175 Leu Gly Tyr Ser Ser Ser Arg Asn Arg Ser Phe Ser Lys Ala Ser Gly 180 185 190 Pro Thr Gin Tyr He Phe His Glu Glu Asp Met Asn Phe Val Asp Ala 195 200 205 Pro Thr He Ser Arg Val Phe Asp Glu Lys Thr Met Tyr Arg Asn Phe 210 215 220 Ser Ser Pro Arg Gly Met Cys Leu He He Asn Asn Glu His Phe Glu 225 230 235 240 Gin Met Pro Thr Arg Asn Gly Thr Lys Ala Asp Lys Asp Asn Leu Thr 245 250 255 Asn Leu Phe Arg Cys Met Gly Tyr Thr Val He Cys Lys Asp Asn Leu 260 265 270 Thr Gly Arg Gly Met Leu Leu Thr He Arg Asp Phe Ala Lys His Glu 275 280 285 Ser His Gly Asp Ser Ala He Leu Val He Leu Ser His Gly Glu Glu 290 295 300 Asn Val He He Gly Val Asp Asp He Pro He Ser Thr His Glu He 305 310 315 320 Tyr Asp Leu Leu Asn Ala Ala Asn Ala Pro Arg Leu Ala Asn Lys Pro 325 330 335 Lys He Val Phe Val Gin Ala Cys Arg Gly Glu Arg Arg Asp Asn Gly 340 345 350 Phe Pro Val Leu Asp Ser Val Asp Gly Val Pro Ala Phe Leu Arg Arg 355 360 365 Gly Trp Asp Asn Arg Asp Gly Pro Leu Phe Asn Phe Leu Gly Cys Val 370 375 380 Arg Pro Gin Val Gin Gin Val Trp Arg Lys Lys Pro Ser Gin Ala Asp 385 390 395 400 He Leu He Arg Tyr Ala Thr Thr Ala Gin Tyr Val Ser Trp Arg Asn 405 410 415 Ser Ala Arg Gly Ser Trp Phe He Gin Ala Val Cys Glu Val Phe Ser 420 425 430 Thr His Ala Lys Asp Met Asp Val Val Glu Leu Leu Thr Glu Val Asn 435 440 445 Lys Lys Val Ala Cys Gly Phe Gin Thr Ser Gin Gly Ser Asn He Leu 450 455 460 Lys Gin Met Pro Glu Met Thr Ser Arg Leu Leu Lys Lys Phe Tyr Phe 465 470 475 480 Trp Pro Glu Ala Arg Asn Ser Ala Val 485 (2) INFORMATION FOR SEQ ID NO: 10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 421 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 10: Met His Pro His His Gin Glu Thr Leu Lys Lys Asn Arg Val Val Leu 1 5 10 15 Ala Lys Gin Leu Leu Leu Ser Glu Leu Leu Glu His Leu Leu Glu Lys 20 25 30 Asp He He Thr Leu Glu Met Arg Glu Leu He Gin Ala Lys Val Gly 35 40 45 Ser Phe Ser Gin Asn Val Glu Leu Leu Asn Leu Leu Pro Lys Arg Gly 50 55 60 Pro Gin Ala Phe Asp Ala Phe Cys Glu Ala Leu Arg Glu Thr Lys Gin 65 70 75 80 Gly His Leu Glu Asp Met Leu Leu Thr Thr Leu Ser Gly Leu Gin His 85 90 95 Val Leu Pro Pro Leu Ser Cys Asp Tyr Asp Leu Ser Leu Pro Phe Pro 100 105 110 Val Cys Glu Ser Cys Pro Leu Tyr Lys Lys Leu Arg Leu Ser Thr Asp 115 120 125 Thr Val Glu His Ser Leu Asp Asn Lys Asp Gly Pro Val Cys Leu Gin 130 135 140 Val Lys Pro Cys Thr Pro Glu Phe Tyr Gin Thr His Phe Gin Leu Ala 145 150 155 160 Tyr Arg Leu Gin Ser Arg Pro Arg Gly Leu Ala Leu Val Leu Ser Asn 165 170 175 Val His Phe Thr Gly Glu Lys Glu Leu Glu Phe Arg Ser Gly Gly Asp 180 185 190 Val Asp His Ser Thr Leu Val Thr Leu Phe Lys Leu Leu Gly Tyr Asp 195 200 205 Val His Val Leu Cys Asp Gin Thr Ala Gin Glu Met Gin Glu Lys Leu 210 215 220 Gin Asn Phe Ala Gin Leu Pro Ala His Arg Val Thr Asp Ser Cys He 225 230 235 240 Val Ala Leu Leu Ser His Gly Val Glu Gly Ala He Tyr Gly Val Asp 245 250 255 Gly Lys Leu Leu Gin Leu Gin Glu Val Phe Gin Leu Phe Asp Asn Ala 260 265 270 Asn Cys Pro Ser Leu Gin Asn Lys Pro Lys Met Phe Phe He Gin Ala 275 280 285 Cys Arg Gly Asp Glu Thr Asp Arg Gly Val Asp Gin Gin Asp Gly Lys 290 295 300 Asn His Ala Gly Ser Pro Gly Cys Glu Glu Ser Asp Ala Gly Lys Glu 305 310 315 320 Lys Leu Pro Lys Met Arg Leu Pro Thr Arg Ser Asp Met He Cys Gly 325 330 335 Tyr Ala Cys Leu Lys Gly Thr Ala Ala Met Arg Asn Thr Lys Arg Gly 340 345 350 Ser Trp Tyr He Glu Ala Leu Ala Gin Val Phe Ser Glu Arg Ala Cys 355 360 365 Asp Met His Val Ala Asp Met Leu Val Lys Val Asn Ala Leu He Lys 370 375 380 Asp Arg Glu Gly Tyr Ala Pro Gly Thr Glu Phe His Arg Cys Lys Glu 385 390 395 400 Met Ser Glu Tyr Cys Ser Thr Leu Cys Arg His Leu Tyr Leu Phe Pro 405 410 415 Gly His Pro Pro Thr 420 (2) INFORMATION FOR SEQ ID NO: 11: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 376 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein ( i) SEQUENCE DESCRIPTION: SEQ ID NO: 11: Val Lys Lys Asp Asn His Lys Lys Lys Thr Val Lys Met Leu Glu Tyr 1 5 10 15 Leu Gly Lys Asp Val Leu His Gly Val Phe Asn Tyr Leu Ala Lys His 20 25 30 Asp Val Leu Thr Leu Lys Glu Glu Glu Lys Lys Lys Tyr Tyr Asp Ala 35 40 45 Lys He Glu Asp Lys Ala Leu He Leu Val Asp Ser Leu Arg Lys Asn 50 55 60 Arg Val Ala His Gin Met Phe Thr Gin Thr Leu Leu Asn Met Asp Gin 65 70 75 80 Lys He Thr Ser Val Lys Pro Leu Leu Gin He Glu Ala Gly Pro Pro 85 90 95 Glu Ser Ala Glu Ser Thr Asn He Leu Lys Leu Cys Pro Arg Glu Glu 100 105 110 Phe Leu Arg Leu Cys Lys Lys Asn His Asp Glu He Tyr Pro He Lys 115 120 125 Lys Arg Glu Asp Arg Arg Arg Leu Ala Leu He He Cys Asn Thr Lys 130 135 140 Phe Asp His Leu Pro Ala Arg Asn Gly Ala His Tyr Asp He Val Gly 145 150 155 160 Met Lys Arg Leu Leu Gin Gly Leu Gly Tyr Thr Val Val Asp Glu Lys 165 170 175 Asn Leu Thr Ala Arg Asp Met Glu Ser Val Leu Arg Ala Phe Ala Ala 180 185 190 Arg Pro Glu His Lys Ser Ser Asp Ser Thr Phe Leu Val Leu Met Ser 195 200 205 His Gly He Leu Glu Gly He Cys Gly Thr Ala His Lys Lys Lys Lys 210 215 220 Pro Asp Val Leu Leu Tyr Asp Thr He Phe Gin He Phe Asn Asn Arg 225 230 235 240 Asn Cys Leu Ser Leu Lys Asp Lys Pro Lys Val He He Val Gin Ala 245 250 255 Cys Arg Gly Glu Lys His Gly Glu Leu Trp Val Arg Asp Ser Pro Ala 260 265 270 Ser Leu Ala Val He Ser Ser Gin Ser Ser Glu Asn Leu Glu Ala Asp 275 280 285 Ser Val Cys Lys He His Glu Glu Lys Asp Phe He Ala Phe Cys Ser 290 295 300 Ser Thr Pro His Asn Val Ser Trp Arg Asp Arg Thr Arg Gly Ser He 305 310 315 320 Phe He Thr Glu Leu He Thr Cys Phe Gin Lys Tyr Ser Cys Cys Cys 325 330 335 His Leu Met Glu He Phe Arg Lys Val Gin Lys Ser Phe Glu Val Pro 340 345 350 Gin Ala Lys Ala Gin Met Pro Thr He Glu Arg Ala Thr Leu Thr Arg 355 360 365 Asp Phe Tyr Leu Phe Pro Gly Asn 370 375 (2) INFORMATION FOR SEQ ID NO: 12: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 377 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 12: Met Ala Glu Gly Asn His Arg Lys Lys Pro Leu Lys Val Leu Glu Ser 1 5 10 15 Leu Gly Lys Asp Phe Leu Thr Gly Val Leu Asp Asn Leu Val Glu Gin 20 25 30 Asn Val Leu Asn Trp Lys Glu Glu Glu Lys Lys Lys Tyr Tyr Asp Ala 35 40 45 Lys Thr Glu Asp Lys Val Arg Val Met Ala Asp Ser Met Gin Glu Lys 50 55 60 Gin Arg Met Ala Gly Gin Met Leu Leu Gin Thr Phe Phe Asn He Asp 65 70 75 80 Gin He Ser Pro Asn Lys Lys Ala His Pro Asn Met Glu Ala Gly Pro 85 90 95 Pro Glu Ser Gly Glu Ser Thr Asp Ala Leu Lys Leu Cys Pro Eis Glu 100 105 110 Glu Phe Leu Arg Leu Cys Lys Glu Arg Ala Glu Glu He Tyr Pro He 115 120 125 Lys Glu Arg Asn Asn Arg Thr Arg Leu Ala Leu He He Cys Asn Thr 130 135 140 Glu Phe Asp His Leu Pro Pro Arg Asn Gly Ala Asp Phe Asp He Thr 145 150 155 160 Gly Met Lys Glu Leu Leu Glu Gly Leu Asp Tyr Ser Val Asp Val Glu 165 170 175 Glu Asn Leu Thr Ala Arg Asp Met Glu Ser Ala Leu Arg Ala Phe Ala 180 185 190 Thr Arg Pro Glu His Lys Ser Ser Asp Ser Thr Phe Leu Val Leu Met 195 200 205 Ser His Gly He Leu Glu Gly He Cys Gly Thr Val His Asp Glu Lys 210 215 220 Lys Pro Asp Val Leu Leu Tyr Asp Thr He Phe Gin He Phe Asn Asn 225 230 235 240 Arg Asn Cys Leu Ser Leu Lys Asp Lys Pro Lys Val He He Val Gin 245 250 255 Ala Cys Arg Gly Ala Asn Arg Gly Glu Leu Trp Val Arg Asp Ser Pro 260 265 270 Ala Ser Leu Glu Val Ala Ser Ser Gin Ser Ser Glu Asn Leu Glu Glu 275 280 285 Asp Ala Val Tyr Lys Thr His Val Glu Lys Asp Phe He Ala Phe Cys 290 295 300 Ser Ser Thr Pro His Asn Val Ser Trp Arg Asp Ser Thr Met Gly Ser 305 310 315 320 He Phe He Thr Gin Leu He Thr Cys Phe Gin Lys Tyr Ser Trp Cys 325 330 335 Cys His Leu Glu Glu Val Phe Arg Lys Val Gin Gin Ser Phe Glu Thr 340 345 350 Pro Arg Ala Lys Ala Gin Met Pro Thr He Glu Arg Leu Ser Met Thr 355 360 365 Arg Tyr Phe Tyr Leu Phe Pro Gly Asn 370 375 (2) INFORMATION FOR SEQ ID NO: 13: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 404 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein ( i) SEQUENCE DESCRIPTION: SEQ ID NO: 13: Met Ala Asp Lys Val Leu Lys Glu Lys Arg Lys Leu Phe He Arg Ser 1 5 10 15 Met Gly Glu Gly Thr He Asn Gly Leu Leu Asp Glu Leu Leu Gin Thr 20 25 30 Arg Val Leu Asn Lys Glu Glu Met Glu Lys Val Lys Arg Glu Asn Ala 35 40 45 Thr Val Met Asp Lys Thr Arg Ala Leu He Asp Ser Val He Pro Lys 50 55 60 Gly Ala Gin Ala Cys Gin He Cys He Thr Tyr He Cys Glu Glu Asp 65 70 75 80 Ser Tyr Leu Ala Gly Thr Leu Gly Leu Ser Ala Asp Gin Thr Ser Gly 85 90 95 Asn Tyr Leu Asn Met Gin Asp Ser Gin Gly Val Leu Ser Ser Phe Pro 100 105 110 Ala Pro Gin Ala Val Gin Asp Asn Pro Ala Met Pro Thr Ser Ser Gly 115 120 125 Ser Glu Gly Asn Val Lys Leu Cys Ser Leu Glu Glu Ala Gin Arg He 130 135 140 Trp Lys Gin Lys Ser Ala Glu He Tyr Pro He Met Asp Lys Ser Ser 145 150 155 160 Arg Thr Arg Leu Ala Leu He He Cys Asn Glu Glu Phe Asp Ser He 165 170 175 Pro Arg Arg Thr Gly Ala Glu Val Asp He Thr Gly Met Thr Met Leu 180 185 190 Leu Gin Asn Leu Gly Tyr Ser Val Asp Val Lys Lys Asn Leu Thr Ala 195 200 205 Ser Asp Met Thr Thr Glu Leu Glu Ala Phe Ala His Arg Pro Glu His 210 215 220 Lys Thr Ser Asp Ser Thr Phe Leu Val Phe Met Ser His Gly He Arg 225 230 235 240 Glu Gly He Cys Gly Lys Lys His Ser Glu Gin Val Pro Asp He Leu 245 250 255 Gin Leu Asn Ala He Phe Asn Met Leu Asn Thr Lys Asn Cys Pro Ser 260 265 270 Leu Lys Asp Lys Pro Lys Val He He He Gin Ala Cys Arg Gly Asp 275 280 285 Ser Pro Gly Val Val Trp Phe Lys Asp Ser Val Gly Val Ser Gly Asn 290 295 300 Leu Ser Leu Pro Thr Thr Glu Glu Phe Glu Asp Asp Ala He Lys Lys 305 310 315 320 Ala His He Glu Lys Asp Phe He Ala Phe Cys Ser Ser Thr Pro Asp 325 330 335 Asn Val Ser Trp Arg His Pro Thr Met Gly Ser Val Phe He Gly Arg 340 345 350 Leu He Glu His Met Gin Glu Tyr Ala Cys Ser Cys Asp Val Glu Glu 355 360 365 He Phe Arg Lys Val Arg Phe Ser Phe Glu Gin Pro Asp Gly Arg Ala 370 375 380 Gin Met Pro Thr Thr Glu Arg Val Thr Leu Thr Arg Cys Phe Tyr Leu 385 390 395 400 Phe Pro Gly His (2) INFORMATION FOR SEQ ID NO: 14: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2887 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 14: GATTCTGCCT TTCTGCTGGA GGGAAGTGTT TTCACAGGTT CTCCTCCTTT TATCTTTTGT 60 GTTTTTTTTC AAGCCCTGCT GAATTTGCTA GTCAACTCAA CAGGAAGTGA GGCCATGGAG 120 GGAGGCAGAA GAGCCAGGGT GGTTATTGAA AGTAGAAGAA ACTTCTTCCT GGGAGCCTTT 180 CCCACCCCCT TCCCTGCTGA GCACGTGGAG TTAGGCAGGT TAGGGGACTC GGAGACTGCG 240 ATGGTGCCAG GAAAGGGTGG AGCGGATTAT ATTCTCCTGC CTTTTAAAAA GATGGACTTC 300 AGCAGAAATC TTTATGATAT TGGGGAACAA CTGGACAGTG AAGATCTGGC CTCCCTCAAG 360 TTCCTGAGCC TGGACTACAT TCCGCAAAGG AAGCAAGAAC CCATCAAGGA TGCCTTGATG 420 TTATTCCAGA GACTCCAGGA AAAGAGAATG TTGGAGGAAA GCAATCTGTC CTTCCTGAAG 480 GAGCTGCTCT TCCGAATTAA TAGACTGGAT TTGCTGATTA CCTACCTAAA CACTAGAAAG 540 GAGGAGATGG AAAGGGAACT TCAGACACCA GGCAGGGCTC AAATTTCTGC CTACAGGGTC 600 ATGCTCTATC AGATTTCAGA AGAAGTGAGC AGATCAGAAT TGAGGTCTTT TAAGTTTCTT 660 TTGCAAGAGG AAATCTCCAA ATGCAAACTG GATGATGACA TGAACCTGCT GGATATTTTC 720 ATAGAGATGG AGAAGAGGGT CATCCTGGGA GAAGGAAAGT TGGACATCCT GAAAAGAGTC 780 TGTGCCCAAA TCAACAAGAG CCTGCTGAAG ATAATCAACG ACTATGAAGA ATTCAGCAAA 840 GAGAGAAGCA GCAGCCTTGA AGGAAGTCCT GATGAATTTT CAAATGGGGA GGAGTTGTGT 900 GGGGTAATGA CAATCTCGGA CTCTCCAAGA GAACAGGATA GTGAATCACA GACTTTGGAC 960 AAAGTTTACC AAATGAAAAG CAAACCTCGG GGATACTGTC TGATCATCAA CAATCACAAT 1020 TTTGCAAAAG CACGGGAGAA AGTGCCCAAA CTTCACAGCA TTAGGGACAG GAATGGAACA 1080 CACTTGGATG CAGGGGCTTT GACCACGACC TTTGAAGAGC TTCATTTTGA GATCAAGCCC 11 0 CACGATGACT GCACAGTAGA GCAAATCTAT GAGATTTTGA AAATCTACCA ACTCATGGAC 1200 CACAGTAACA TGGACTGCTT CATCTGCTGT ATCCTCTCCC ATGGAGACAA AGGCATCATC 1260 TATGGCACTG ATGGACAGGA GGCCCCCATC TATGAGCTGA CATCTCAGTT CACTGGTTTG 1320 AAGTGCCCTT CCCTTGCTGG AAAACCCAAA GTGTTTTTTA TTCAGGCTTG TCAGGGGGAT 1380 AACTACCAGA AAGGTATACC TGTTGAGACT GATTCAGAGG AGCAACCCTA TTTAGAAATG 1440 GATTTATCAT CACCTCAAAC GAGATATATC CCGGATGAGG CTGACTTTCT GCTGGGGATG 1500 GCCACTGTGA ATAACTGTGT TTCCTACCGA AACCCTGCAG AGGGAACCTG GTACATCCAG 1560 TCACTTTGCC AGAGCCTGAG AGAGCGATGT CCTCGAGGCG ATGATATTCT CACCATCCTG 1620 ACTGAAGTGA ACTATGAAGT AAGCAACAAG GATGACAAGA AAAACATGGG GAAACAGATG 1680 CCTCAGCCTA CTTTCACACT AAGAAAAAAA CTTGTCTTCC CTTCTGATTG ATGGTGCTAT 1740 TTTGTTTGTT TTGTTTTGTT TTGTTTTTTT GAGACAGAAT CTCGCTCTGT CGCCCAGGCT 1800 GGAGTGCAGT GGCGTGATCT CGGCTCACCG CAAGCTCCGC CTCCCGGGTT CACGCCATTC 1860 TCCTGCCTCA GCCTCCCGAG TAGCTGGGAC TACAGGGGCC CGCCACCACA CCTGGCTAAT 1920 TTTTTAAAAA TATTTTTAGT AGAGACAGGG TTTCACTGTG TTAGCCAGGG TGGTCTTGAT 1980 CTCCTGACCT CGTGATCCAC CCACCTCGGC CTCCCAAAGT GCTGGGATTA CAGGCGTGAG 2040 CCACCGCGCC TGGCCGATGG TACTATTTAG ATATAACACT ATGTTTATTT ACTAATTTTC 2100 TAGATTTTCT ACTTTATTAA TTGTTTTGCA CTTTTTTATA AGAGCTAAAG TTAAATAGGA 2160 TATTAACAAC AATAACACTG TCTCCTTTCT CTTACGCTTA AGGCTTTGGG AATGTTTTTA 2220 GCTGGTGGCA ATAAATACCA GACACGTACA AAATCCAGCT ATGAATATAG AGGGCTTATG 2 80 ATTCAGATTG TTATCTATCA ACTATAAGCC CACTGTTAAT ATTCTATTAA CTTTAATTCT 2340 CTTTCAAAGC TAAATTCCAC ACTACCACAT TAAAAAAATT AGAAAGTAGC CACGTATGGT 2400 GGCTCATGTC TATAATCCCA GCACTTTGGG AGGTTGAGGT GGGAGGATTT GCTTGAACCC 2460 AAGAGGTCCA AGGCTGCAGT GAGCCATGTT CACACCGCTG CACTCAAGCT TGGGTGACAG 2520 AGCAAGACCC CGTCCCCAAA AAAATTTTTT TTTTAATAAA CCCAAATTTG TTTGAAAACT 2580 TTTAAAAATT CAAATGATTT TTACAAGTTT TAAATAAGCT CTCCCCAAAC TTGCTTTATG 2640 CCTTCTTATT GCTTTTATGA TATATATATG CTTGGCTAAC TATATTTGCT TTTTGCTAAC 2700 AATGCTCTGG GGTCTTTTTA TGCATTTGCA TTTGCTCTTT CATCTCTGCT TGGATTATTT 2760 TAAATCATTA GGAATTAAGT TATCTTTAAA ATTTAAGTAT CTTTTTTCCA AAACATTTTT 2820 TAATAGAATA AAATATAATT TGATCTTAAA AAAAAAAAAA AAAAAAAAAA AAAAAAAAAA 2880 AAAAAAA 2887 (2) INFORMATION FOR SEQ ID NO: 15: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1323 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (Xi) SEQUENCE DESCRIPTION: SEQ ID NO: 15: AAATGCAAAC TGGATGATGA CATGAACCTG CTGGATATTT TCATAGAGAT CGAGAAGAGG 60 GTCATCCTGG GAGAAGGAAA GTTGGACATC CTGAAAAGAG TCTGTGCCCA AATCAACAAG 120 AGCCTGCTGA AGATAATCAA CGACTATGAA GAATTCAGCA AAGGGGAGGA GTTGTGTGGG 180 GTAATGACAA TCTCGGACTC TCCAAGAGAA CAGGATAGTG AATCACAGAC TTTGGACAAA 240 GTTTACCAAA TGAAAAGCAA ACCTCGGGGA TACTGTCTGA TCATCAACAA TCACAATTTT 300 GCAAAAGCAC GGGAGAAAGT GCCCAAACTT CACAGCATTA GGGACAGGAA TGGAACACAC 360 TTGGATGCAG GGGCTTTGAC CACGACCTTT GAAGAGCTTC ATTTTGAGAT CAAGCCCCAC 420 GATGACTGCA CAGTAGAGCA AATCTATGAG ATTTTGAAAA TCTACCAACT CATGGACCAC 480 AGTAACATGG ACTGCTTCAT CTGCTGTATC CTCTCCCATG GAGACAAAGG CATCATCTAT 540 GGCACTGATG GACAGGAGGC CCCCATCTAT GAGCTGACAT CTCAGTTCAC TGGTTTGAAG 600 TGCCCTTCCC TTGCTGGAAA ACCCAAAGTG TTTTTTATTC TTATCATCAC CTCAAACGAG 660 ATATATCCCG GATGAGGCTG ACTTTCTGCT GGGGATGGCC ACTGTGAATA ACTGTGTTTC 720 CTACCGAAAC CCTGCAGAGG GAACCTGGTA CATCCAGTCA CTTTGCCAGA GCCTGAGAGA 780 GCGATGTCCT CGAGGCGATG ATATTCTCAC CATCCTGACT GAAGTGAACT ATGAAGTAAG 840 CAACAAGGAT GACAAGAAAA ACATGGGGAA ACAGATGCCT CAGCCTACTT TCACACTAAG 900 AAAAAAACTT GTCTTCCCTT CTGATTGATG GTGCTATTTT GTTTGTTTTG TTTTGTTTTG 960 TTTTTTTGAG ACAGAATCTC GCTCTGTCGC CCAGGCTGGA GTGCAGTGGC GTGATCTCGG 1020 CTCACCGCAA GCTCCGCCTC CCGGGTTCAC GCCATTCTCC TGCCTCAGCC TCCCGAGTAG 1080 CTGGGACTAC AGGGGCCCGC CACCACACCT GGCTAATTTT TTAAAAATAT TTTTAGTAGA 1140 GACAGGGTTT CACTGTGTTA GCCAGGGTGG TCTTGATCTC CTGACCTCGT GATCCACCCA 1200 CCTCGGCCTC CCAAAGTGCT GGGATTACAG GCGTGAGCCA CCGCGCCTGG CCGATGGTAC 1260 TATTTAGATA TAACACTATG TTTATTTACT AATTTTCTAG ATTTTCTACT TTATTAATTG 1320 TTT 1323 (2) INFORMATION FOR SEQ ID NO: 16: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 335 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 16: Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He Glu 1 5 10 15 Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu Lys 20 25 30 Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn Asp 35 40 45 Tyr Glu Glu Phe Ser Lys Gly Glu Glu Leu Cys Gly Val Met Thr He 50 55 60 Ser Asp Ser Pro Arg Glu Gin Asp Ser Glu Ser Gin Thr Leu Asp Lys 65 70 75 80 Val Tyr Gin Met Lys Ser Lys Pro Arg Gly Tyr Cys Leu He He Asn 85 90 95 Asn His Asn Phe Ala Lys Ala Arg Glu Lys Val Pro Lys Leu His Ser 100 105 110 He Arg Asp Arg Asn Gly Thr His Leu Asp Ala Gly Ala Leu Thr Thr 115 120 125 Thr Phe Glu Glu Leu His Phe Glu He Lys Pro His Asp Asp Cys Thr 130 135 140 Val Glu Gin He Tyr Glu He Trp Lys He Tyr Gin Leu Met Asp His 145 150 155 160 Ser Asn Met Asp Cys Phe He Cys Cys He Leu Ser His Gly Asp Lys 165 170 175 Gly He He Tyr Gly Thr Asp Gly Gin Glu Gly Pro He Tyr Glu Leu 180 185 190 Thr Ser Gin Phe Thr Gly Leu Lys Cys Pro Ser Leu Ala Gly Lys Pro 195 200 205 Lys Val Phe Phe He Gin Ala Cys Gin Gly Asp Asn Tyr Gin Lys Gly 210 215 220 He Pro Val Glu Thr Asp Ser Glu Glu Gin Pro Tyr Leu Glu Met Asp 225 230 235 240 Leu Ser Ser Pro Gin Thr Arg Tyr He Pro Asp Glu Ala Asp Phe Leu 245 250 255 Leu Gly Met Ala Thr Val Asn Asn Cys Val Ser Tyr Arg Asn Pro Ala 260 265 270 Glu Gly Thr Trp Tyr He Gin Ser Leu Cys Gin Ser Leu Arg Glu Arg 275 280 285 Cys Pro Arg Gly Asp Asp He Leu Thr He Leu Thr Glu Val Asn Tyr 290 295 300 Glu Val Ser Asn Lys Asp Asp Lys Lys Asn Met Gly Lys Gin Met Pro 305 310 315 320 Gin Pro Thr Phe Thr Leu Arg Lys Lys Leu Val Phe Pro Ser Asp 325 330 335 (2) INFORMATION FOR SEQ ID NO: 17: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2619 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 17: GTAGTGGATA GGCCTGTGAC GAAGGTGCTA CCATCGTGAG AGTAAGATTA TATTCTCCTG 60 CCTTTTAAAA AGATGGACTT CAGCAGAAAT CTTTATGATA TTGGGGAACA ACTGGACAGT 120 GAAGATCTGG CCTCCCTCAA GTTCCTGAGC CTGGACTACA TTCCGCAAAG GAAGCAAGAA 180 CCCATCAAGG ATGCCTTGAT GTTATTCCAG AGACTCCAGG AAAAGAGAAT GTTGGAGGAA 240 AGCAATCTGT CCTTCCTGAA GGAGCTGCTC TTCCGAATTA ATAGACTGGA TTTGCTGATT 300 ACCTACCTAA ACACTAGAAA GGAGGAGATG GAAAGGGAAC TTCAGACACC AGGCAGGGCT 360 CAAATTTCTG CCTACAGGGT CATGCTCTAT CAGATTTCAG AAGAAGTGAG CAGATCAGAA 420 TTGAGGTCTT TTAAGTTTCT TTTGCAAGAG GAAATCTCCA AATGCAAACT GGATGATGAC 480 ATGAACCTGC TGGATATTTT CATAGAGATG GAGAAGAGGG TCATCCTGGG AGAAGGAAAG 540 TTGGACATCC TGAAAAGAGT CTGTGCCCAA ATCAACAAGA GCCTGCTGAA GATAATCAAC 600 GACTATGAAG AATTCAGCAA AGGGGAGGAG TTGTGTGGGG TAATGACAAT CTCGGACTCT 660 CCAAGAGAAC AGGATAGTGA ATCACAGACT TTGGACAAAG TTTACCAAAT GAAAAGCAAA 720 CCTCGGGGAT ACTGTCTGAT CATCAACAAT CACAATTTTG CAAAAGCACG GGAGAAAGTG 780 CCCAAACTTC ACAGCATTAG GGACAGGAAT GGAACACACT TGGATGCAGG GGCTTTGACC 840 ACGACCTTTG AAGAGCTTCA TTTTGAGATC AAGCCCCACG ATGACTGCAC AGTAGAGCAA 900 ATCTATGAGA TTTTGAAAAT CTACCAACTC ATGGACCACA GTAACATGGA CTGCTTCATC 960 TGCTGTATCC TCTCCCATGG AGACAAAGGC ATCATCTATG GCACTGATGG ACAGGAGGCC 1020 CCCATCTATG AGCTGACATC TCAGTTCACT GGTTTGAAGT GCCCTTCCCT TGCTGGAAAA 1080 CCCAAAGTGT TTTTTATTCA GGCTTGTCAG GGGGATAACT ACCAGAAAGG TATACCTGTT 1140 GAGACTGATT CAGAGGAGCA ACCCTATTTA GAAATGGATT TATCATCACC TCAAACGAGA 1200 TATATCCCGG ATGAGGCTGA CTTTCTGCTG GGGATGGCCA CTGTGAATAA CTGTGTTTCC 1260 TACCGAAACC CTGCAGAGGG AACCTGGTAC ATCCAGTCAC TTTGCCAGAG CCTGAGAGAG 1320 CGATGTCCTC GAGGCGATGA TATTCTCACC ATCCTGACTG AAGTGAACTA TGAAGTAAGC 1380 AACAAGGATG ACAAGAAAAA CATGGGGAAA CAGATGCCTC AGCCTACTTT CACACTAAGA 1440 AAAAAACTTG TCTTCCCTTC TGATTGATGG TGCTATTTTG TTTGTTTTGT TTTGTTTTGT 1500 TTTTTTGAGA CAGAATCTCG CTCTGTCGCC CAGGCTGGAG TGCAGTGGCG TGATCTCGGC 1560 TCACCGCAAG CTCCGCCTCC CGGGTTCACG CCATTCTCCT GCCTCAGCCT CCCGAGTAGC 1620 TGGGACTACA GGGGCCCGCC ACCACACCTG GCTAATTTTT TAAAAATATT TTTAGTAGAG 1680 ACAGGGTTTC ACTGTGTTAG CCAGGGTGGT CTTGATCTCC TGACCTCGTG ATCCACCCAC 1740 CTCGGCCTCC CAAAGTGCTG GGATTACAGG CGTGAGCCAC CGCGCCTGGC CGATGGTACT 1800 ATTTAGATAT AACACTATGT TTATTTACTA ATTTTCTAGA TTTTCTACTT TATTAATTGT 1860 TTTGCACTTT TTTATAAGAG CTAAAGTTAA ATAGGATATT AACAACAATA ACACTGTCTC 1920 CTTTCTCTTA TGCTTAAGGC TTTGGGAATG TTTTTAGCTG GTGGCAATAA ATACCAGACA 1980 CGTACAAAAT CCAGCTATGA ATATAGAGGG CTTATGATTC AGATTGTTAT CTATCAACTA 2040 TAAGCCCACT GTTAATATTC TATTAACTTT AATTCTCTTT CAAAGCTAAA TTCCACACTA 2100 CCACATTAAA AAAATTAGAA AGTAGCCACG TATGGTGGCT CATGTCTATA ATCCCAGCAC 2160 TTTGGGAGGT TGAGGTGGGA GGATTTGCTT GAACCCAAGA GGTCCAAGGC TGCAGTGAGC 2220 CATGTTCACA CCGCTGCACT CAAGCTTGGG TGACAGAGCA AGACCCCGTC CCCAAAAAAA 2280 TTTTTTTTTT AATAAACCCA AATTTGTTTG AAAACTTTTA AAAATTCAAA TGATTTTTAC 2340 AAGTTTTAAA TAAGCTCTCC CCAAACTTGC TTTATGCCTT CTTATTGCTT TTATGATATA 2400 TATATGCTTG GCTAACTATA TTTGCTTTTT GCTAACAATG CTCTGGGGTC TTTTTATGCA 2460 TTTGCATTTG CTCTTTCATC TCTGCTTGGA TTATTTTAAA TCATTAGGAA TTAAGTTATC 2520 TTTAAAATTT AAGTATCTTT TTTCCAAAAC ATTTTTTAAT AGAATAAAAT ATAATTTGAT 2580 CTTAAAAAAA AAAAAAAAAA AAAAAAAAAA AAAAAAAAA 2619 (2) INFORMATION FOR SEQ ID NO: 18: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 464 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (Xi) SEQUENCE DESCRIPTION: SEQ ID NO: 18: Met Asp Phe Ser Arg Asn Leu Tyr Asp He Gly Glu Gin Leu Asp Ser 1 5 10 15 Glu Asp Leu Ala Ser Leu Lys Phe Leu Ser Leu Asp Tyr He Pro Gin 20 25 30 Arg Lys Gin Glu Pro He Lys Asp Ala Leu Met Leu Phe Gin Arg Leu 35 40 45 Gin Glu Lys Arg Met Leu Glu Glu Ser Asn Leu Ser Phe Leu Lys Glu 50 55 60 Leu Leu Phe Arg He Asn Arg Leu Asp Leu Leu He Thr Tyr Leu Asn 65 70 75 80 Thr Arg Lys Glu Glu Met Glu Arg Glu Leu Gin Thr Pro Gly Arg Ala 85 90 95 Gin He Ser Ala Tyr Arg Val Met Leu Tyr Gin He Ser Glu Glu Val 100 105 110 Ser Arg Ser Glu Leu Arg Ser Phe Lys Phe Leu Leu Gin Glu Glu He 115 120 125 Ser Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He 130 135 140 Glu Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu 145 150 155 160 Lys Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn 165 170 175 Asp Tyr Glu Glu Phe Ser Lys Gly Glu Glu Leu Cys Gly Val Met Thr 180 185 190 He Ser Asp Ser Pro Arg Glu Gin Asp Ser Glu Ser Gin Thr Leu Asp 195 200 205 Lys Val Tyr Gin Met Lys Ser Lys Pro Arg Gly Tyr Cys Leu He He 210 215 220 Asn Asn His Asn Phe Ala Lys Ala Arg Glu Lys Val Pro Lys Leu His 225 230 235 240 Ser He Arg Asp Arg Asn Gly Thr His Leu Asp Ala Gly Ala Leu Thr 245 250 255 Thr Thr Phe Glu Glu Leu His Phe Glu He Lys Pro His Asp Asp Cys 260 265 270 Thr Val Glu Gin He Tyr Glu He Leu Lys He Tyr Gin Leu Met Asp 275 280 285 His Ser Asn Met Asp Cys Phe He Cys Cys He Leu Ser His Gly Asp 290 295 300 Lys Gly He He Tyr Gly Thr Asp Gly Gin Glu Ala Pro He Tyr Glu 305 310 315 320 Leu Thr Ser Gin Phe Thr Gly Leu Lys Cys Pro Ser Leu Ala Gly Lys 325 330 335 Pro Lys Val Phe Phe He Gin Ala Cys Gin Gly Asp Asn Tyr Gin Lys 340 345 350 Gly He Pro Val Glu Thr Asp Ser Glu Glu Gin Pro Tyr Leu Glu Met 355 360 365 Asp Leu Ser Ser Pro Gin Thr Arg Tyr He Pro Asp Glu Ala Asp Phe 370 375 380 Leu Leu Gly Met Ala Thr Val Asn Asn Cys Val Ser Tyr Arg Asn Pro 385 390 395 400 Ala Glu Gly Thr Trp Tyr He Gin Ser Leu Cys Gin Ser Leu Arg Glu 405 410 415 Arg Cys Pro Arg Gly Asp Asp He Leu Thr He Leu Thr Glu Val Asn 420 425 430 Tyr Glu Val Ser Asn Lys Asp Asp Lys Lys Asn Met Gly Lys Gin Met 435 440 445 Pro Gin Pro Thr Phe Thr Leu Arg Lys Lys Leu Val Phe Pro Ser Asp 450 455 460 (2) INFORMATION FOR SEQ ID NO: 19: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1301 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 19: CCAAATGCAA ACTGGATGAT GACATGAACC TGCTGGATAT TTTCATAGAG ATGGAGAAGA 60 GGGTCATCCT GGGAGAAGGA AAGTTGGACA TCCTGAAAAG AGTCTGTGCC CAAATCAACA 120 AGAGCCTGCT GAAGATAATC AACGACTATG AAGAATTCAG CAAAGGGGCT TTGACCACGA 180 CCTTTGAAGA GCTTCATTTT GAGATCAAGC CCCACGATGA CTGCACAGTA GAGCAAATCT 240 ATGAGATTTT GAAAATCTAC CAACTCATGG ACCACAGTAA CATGGACTGC TTCATCTGCT 300 GTATCCTCTC CCATGGAGAC AAAGGCATCA TCTATGGCAC TGATGGACAG GAGGCCCCCA 360 TCTATGAGCT GACATCTCAG TTCACTGGTT TGAAGTGCCC TTCCCTTGCT GGAAAACCCA 420 AAGTGTTTTT TATTCAGGCT TGTCAGGGGG ATAACTACCA GAAAGGTATA CCTGTTGAGA 480 CTGATTCAGA GGAGCAACCC TATTTAGAAA TGGATTTATC ATCACCTCAA ACGAGATATA 540 TCCCGGATGA GGCTGACTTT CTGCTGGGGA TGGCCACTGT GAATAACTGT GTTTCCTACC 600 GAAACCCTGC AGAGGGAACC TGGTACATCC AGTCACTTTG CCAGAGCCTG AGAGAGCGAT 660 GTCCTCGAGG CGATGATATT CTCACCATCC TGACTGAAGT GAACTATGAA GTAAGCAACA 720 AGGATGACAA GAAAAACATG GGGAAACAGA TGCCTCAGCC TACTTTCACA CTAAGAAAAA 780 AACTTGTCTT CCCTTCTGAT TGATGGTGCT ATTTTGTTTG TTTTGTTTTG TTTTGTTTTT 840 TTGAGACAGA ATCTCGCTCT GTCGCCCAGG CTGGAGTGCA GTGGCGTGAT CTCGGCTCAC 900 CGCGAGCTCC GCCTCCCGGG TTCACGCCAT TCTCCTGCCT CAGCCTCCCG AGTAGCTGGG 960 ACTACAGGGG CCCGCCATCA CACCTGGCTA ATTTTTTAAA AATATTTTTA GTAGAGACAG 1020 GGTTTCACTG TGTTAGCCAG GGTGGTCTTG ATCTCCTGAC CTCGTGATCC ACCCACCTCG 1080 GCCTCCCAAA GTGCTGGGAT TACAGGCGTG AGCCACCGCG CCTGGCCGAT GGTACTATTT 1140 AGATATAACA CTATGTTTAT TTACTAATTT TCTAGATTTT CTACTTTATT AATTGTTTTG 1200 CACTTTTTTA TAAGAGCTAA AGTTAAATAG GATATTAACA ACAATAACAC TGTCTCCTTT 1260 CTCTTACGCT TAAGGCTTTG GGAATGTTTT TAGCTGGTGG C 1301 (2) INFORMATION FOR SEQ ID NO: 20: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 266 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 20: Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He Glu 1 5 10 15 Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu Lys 20 25 30 Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn Asp 35 40 45 Tyr Glu Glu Phe Ser Lys Gly Ala Leu Thr Thr Thr Phe Glu Glu Leu 50 55 60 His Phe Glu He Lys Pro His Asp Asp Cys Thr Val Glu Gin He Tyr 65 70 75 80 Glu He Leu Lys He Tyr Gin Leu Met Asp His Ser Asn Met Asp Cys 85 90 95 Phe He Cys Cys He Leu Ser His Gly Asp Lys Gly He He Tyr Gly 100 105 110 Thr Asp Gly Gin Glu Ala Pro He Tyr Glu Leu Thr Ser Gin Phe Thr 115 120 125 Gly Leu Lys Cys Pro Ser Leu Ala Gly Lys Pro Lys Val Phe Phe He 130 135 140 Gin Ala Cys Gin Gly Asp Asn Tyr Gin Lys Gly He Pro Val Glu Thr 145 150 155 160 Asp Ser Glu Glu Gin Pro Tyr Leu Glu Met Asp Leu Ser Ser Pro Gin 165 170 175 Thr Arg Tyr He Pro Asp Glu Ala Asp Phe Leu Leu Gly Met Ala Thr 180 185 190 Val Asn Asn Cys Val Ser Tyr Arg Asn Pro Ala Glu Gly Thr Trp Tyr 195 200 205 He Gin Ser Leu Cys Gin Ser Leu Arg Glu Arg Cys Pro Arg Gly Asp 210 215 220 Asp He Leu Thr He Leu Thr Glu Val Asn Tyr Glu Val Ser Asn Lys 225 230 235 240 Asp Asp Lys Lys Asn Met Gly Lys Gin Met Pro Gin Pro Thr Phe Thr 245 250 255 Leu Arg Lys Lys Leu Val Phe Pro Ser Asp 260 265 (2) INFORMATION FOR SEQ ID NO: 21: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 334 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: CDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 21: CCAAATGCAA ACTGGATGAT GACATGAACC TGCTGGATAT TTTCATAGAG ATGGAGAAGA 60 GGGTCATCCT GGGAGAAGGA AAGTTGGACA TCCTGAAAAG AGTCTGTGCC CAAATCAACA 120 AGAGCCTGCT GAAGATAATC AACGACTATG AAGAATTCAG CAAAGACTTT GGACAAAGTT 180 TACCAAATGA AAAGCAAACC TCGGGGATAC TGTCTGATCA TCAACAATCA CAATTTTGCA 240 AAAGCACGGG AGAAAGTGCC CAAACTTCAC AGCATTAGGG ACAGGAATGG AACACACTTG 300 GATGCAGGGT TTGAGAATGT TTTTAGCTGG TGGC 334 (2) INFORMATION FOR SEQ ID NO: 22: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 91 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 22: Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He Glu 1 5 10 15 Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu Lys 20 25 30 Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn Asp 35 40 45 Tyr Glu Glu Phe Ser Lys Asp Phe Gly Gin Ser Leu Pro Asn Glu Lys 50 55 60 Gin Thr Ser Gly He Leu Ser Asp His Gin Gin Ser Gin Phe Cys Lys 65 70 75 80 Ser Thr Gly Glu Ser Ala Gin Thr Ser Gin His 85 90 (2) INFORMATION FOR SEQ ID NO: 23: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 829 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 23: ATGGACTTCA GCAGAAATCT TTATGATATT GGGGAACAAC TGGACAGTGA AGATCTGGCC 60 TCCCTCAAGT TCCTGAGCCT GGACTACATT CCGCAAAGGA AGCAAGAACC CATCAAGGAT 120 GCCTTGATGT TATTCCAGAG ACTCCAGGAA AAGAGAATGT TGGAGGAAAG CAATCTGTCC 180 TTCCTGAAGG AGCTGCTCTT CCGAATTAAT AGACTGGATT TGCTGATTAC CTACCTAAAC 240 ACTAGAAAGG AGGAGATGGA AAGGGAACTT CAGACACCAG GCAGGGCTCA AATTTCTGCC 300 TACAGGGTCA TGCTCTATCA GATTTCAGAA GAAGTGAGCA GATCAGAATT GAGGTCTTTT 360 AAGTTTCTTT TGCAAGAGGA AATCTCCAAA TGCAAACTGG ATGATGACAT GAACCTGCTG 420 GATATTTTCA TAGAGATGGA GAAGAGGGTC ATCCTGGGAG AAGGAAAGTT GGACATCCTG 480 AAAAGAGTCT GTGCCCAAAT CAACAAGAGC CTGCTGAAGA TAATCAACGA CTATGAAGAA 540 TTCAGCAAAG AGAGAAGCAG CAGCCTTGAA GGAAGTCCTG ATGAATTTTC AAATGGGGAG 600 GAGTTGTGTG GGGTAATGAC AATCTCGGAC TCTCCAAGAG AACAGGATAG TGAATCACAG 660 ACTTTGGACA AAGTTTACCA AATGAAAAGC AAACCTCGGG GATACTGTCT GATCATCAAC 720 AATCACAATT TTGCAAAAGC ACGGGAGAAA GTGCCCAAAC TTCACAGCAT TAGGGACAGG 780 AATGGAACAC ACTTGGATGC AGGGTTTGGG AATGTTTTTA GCTGGTGGC 829 (2) INFORMATION FOR SEQ ID NO: 24: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 784 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 24: ATGGACTTCA GCAGAAATCT TTATGATATT GGGGAACAAC TGGACAGTGA AGATCTGGCC 60 TCCCTCAAGT TCCTGAGCCT GGACTACATT CCGCAAAGGA AGCAAGAACC CATCAAGGAT 120 GCCTTGATGT TATTCCAGAG ACTCCAGGAA AAGAGAATGT TGGAGGAAAG CAATCTGTCC 180 TTCCTGAAGG AGCTGCTCTT CCGAATTAAT AGACTGGATT TGCTGATTAC CTACCTAAAC 240 ACTAGAAAGG AGGAGATGGA AAGGGAACTT CAGACACCAG GCAGGGCTCA AATTTCTGCC 300 TACAGGGTCA TGCTCTATCA GATTTCAGAA GAAGTGAGCA GATCAGAATT GAGGTCTTTT 360 AAGTTTCTTT TGCAAGAGGA AATCTCCAAA TGCAAACTGG ATGATGACAT GAACCTGCTG 420 GATATTTTCA TAGAGATGGA GAAGAGGGTC ATCCTGGGAG AAGGAAAGTT GGACATCCTG 480 AAAAGAGTCT GTGCCCAAAT CAACAAGAGC CTGCTGAAGA TAATCAACGA CTATGAAGAA 540 TTCAGCAAAG GGGAGGAGTT GTGTGGGGTA ATGACAATCT CGGACTCTCC AAGAGAACAG 600 GATAGTGAAT CACAGACTTT GGACAAAGTT TACCAAATGA AAAGCAAACC TCGGGGATAC 660 TGTCTGATCA TCAACAATCA CAATTTTGCA AAAGCACGGG AGAAAGTGCC CAAACTTCAC 720 AGCATTAGGG ACAGGAATGG AACACACTTG GATGCAGGGT TTGGGAATGT TTTTAGCTGG 780 TGGC 784 (2) INFORMATION FOR SEQ ID NO: 25: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 261 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 25: Met Asp Phe Ser Arg Asn Leu Tyr Asp He Gly Glu Gin Leu Asp Ser 1 5 10 15 Glu Asp Leu Ala Ser Leu Lys Phe Leu Ser Leu Asp Tyr He Pro Gin 20 25 30 Arg Lys Gin Glu Pro He Lys Asp Ala Leu Met Leu Phe Gin Arg Leu 35 40 45 Gin Glu Lys Arg Met Leu Glu Glu Ser Asn Leu Ser Phe Leu Lys Glu 50 55 60 Leu Leu Phe Arg He Asn Arg Leu Asp Leu Leu He Thr Tyr Leu Asn 65 70 75 80 Thr Arg Lys Glu Glu Met Glu Arg Glu Leu Gin Thr Pro Gly Arg Ala 85 90 95 Gin He Ser Ala Tyr Arg Val Met Leu Tyr Gin He Ser Glu Glu Val 100 105 110 Ser Arg Ser Glu Leu Arg Ser Phe Lys Phe Leu Leu Gin Glu Glu He 115 120 125 Ser Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He 130 135 140 Glu Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu 145 150 155 160 Lys Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn 165 170 175 Asp Tyr Glu Glu Phe Ser Lys Gly Glu Glu Leu Cys Gly Val Met Thr 180 185 190 He Ser Asp Ser Pro Arg Glu Gin Asp Ser Glu Ser Gin Thr Leu Asp 195 200 205 Lys Val Tyr Gin Met Lys Ser Lys Pro Arg Gly Tyr Cys Leu He He 210 215 220 Asn Asn His Asn Phe Ala Lys Ala Arg Glu Lys Val Pro Lys Leu His 225 230 235 240 Ser He Arg Asp Arg Asn Gly Thr His Leu Asp Ala Gly Phe Gly Asn 245 250 255 Val Phe Ser Trp Trp 260 (2) INFORMATION FOR SEQ ID NO: 26: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: oligonucleotide (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 26: GACTCGAGTC TAGAGTCGAC TTTTTTTTTT TTTTTTT 37 (2) INFORMATION FOR SEQ ID NO: 27: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: oligonucleotide (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 27: GACTCGAGTC TAGAGTCGAC 20 (2) INFORMATION FOR SEQ ID NO: 28: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: oligonucleotide (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 28: GAGGATCCCC AAATGCAAAC TGGATGATGA C 31 (2) INFORMATION FOR SEQ ID NO: 29: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: oligonucleotide (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 29: TTGGATCCAG ATGGACTTCA GCAGAAATCT T 31 (2) INFORMATION FOR SEQ ID NO: 30: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 277 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 30: Met Glu Asn Thr Glu Asn Ser Val Asp Ser Lys Ser He Lys Asn Leu 1 5 10 15 Glu Pro Lys He He His Gly Ser Glu Ser Met Asp Ser Gly He Ser 20 25 30 Leu Asp Asn Ser Tyr Lys Met Asp Tyr Pro Glu Met Gly Leu Cys He 35 40 45 He He Asn Asn Lys Asn Phe His Lys Ser Thr Gly Met Thr Ser Arg 50 55 60 Ser Gly Thr Asp Val Asp Ala Ala Asn Leu Arg Glu Thr Phe Arg Asn 65 70 75 80 Leu Lys Tyr Glu Val Arg Asn Lys Asn Asp Leu Thr Arg Glu Glu He 85 90 95 Val Glu Leu Met Arg Asp Val Ser Lys Glu Asp His Ser Lys Arg Ser 100 105 110 Ser Phe Val Cys Val Leu Leu Ser His Gly Glu Glu Gly He He Phe 115 120 125 Gly Thr Asn Gly Pro Val Asp Leu Lys Lys He Thr Asn Phe Phe Arg 130 135 140 Gly Asp Arg Cys Arg Ser Leu Thr Gly Lys Pro Lys Leu Phe He He 145 150 155 160 Gin Ala Cys Arg Gly Thr Glu Leu Asp Cys Gly He Glu Thr Asp Ser 165 170 175 Gly Val Asp Asp Asp Met Ala Cys His Lys He Pro Val Asp Ala Asp 180 185 190 Phe Leu Tyr Ala Tyr Ser Thr Ala Pro Gly Tyr Tyr Ser Trp Arg Asn 195 200 205 Ser Lys Asp Gly Ser Trp Phe He Gin Ser Leu Cys Ala Met Leu Lys 210 215 220 Gin Tyr Ala Asp Lys Leu Glu Phe Met His He Leu Thr Arg Val Asn 225 230 235 240 Arg Lys Val Ala Thr Glu Phe Glu Ser Phe Ser Phe Asp Ala Thr Phe 245 250 255 His Ala Lys Lys Gin He Pro Cys He Val Ser Met Leu Thr Lys Glu 260 265 270 Leu Tyr Phe Tyr His 275 (2) INFORMATION FOR SEQ ID NO: 31: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 293 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein ( i) SEQUENCE DESCRIPTION: SEQ ID NO: 31: Met Ser Ser Ala Ser Gly Leu Arg Arg Gly His Pro Ala Gly Gly Glu 1 5 10 15 Glu Asn Met Thr Glu Thr Asp Ala Phe Tyr Lys Arg Glu Met Phe Asp 20 25 30 Pro Ala Glu Lys Tyr Lys Met Asp His Arg Arg Arg Gly He Ala Leu 35 40 45 He Phe Asn His Glu Arg Phe Phe Trp His Leu Thr Leu Pro Glu Arg 50 55 60 Arg Arg Thr Cys Ala Asp Arg Asp Asn Leu Thr Arg Arg Phe Ser Asp 65 70 75 80 Leu Gly Phe Glu Val Lys Cys Phe Asn Asp Leu Lys Ala Glu Glu Leu 85 90 95 Leu Leu Lys He His Glu Val Ser Thr Val Ser His Ala Asp Ala Asp 100 105 110 Cys Phe Val Cys Val Phe Leu Ser His Gly Glu Gly Asn His He Tyr 115 120 125 Ala Tyr Asp Ala Lys He Glu He Gin Thr Leu Thr Gly Leu Phe Lys 130 135 140 Gly Asp Lys Cys His Ser Leu Val Gly Lys Pro Lys He Phe He He 145 150 155 160 Gin Ala Cys Arg Gly Asn Gin His Asp Val Pro Val He Pro Leu Asp 165 170 175 Val Val Asp Asn Gin Thr Glu Lys Leu Asp Thr Asn He Thr Glu Val 180 185 190 Asp Ala Ala Ser Val Tyr Thr Leu Pro Ala Gly Ala Asp Phe Leu Met 195 200 205 Cys Tyr Ser Val Ala Glu Gly Tyr Tyr Ser His Arg Glu Thr Val Asn 210 215 220 Gly Ser Trp Tyr He Gin Asp Leu Cys Glu Met Leu Gly Lys Tyr Gly 225 230 235 240 Ser Ser Leu Glu Phe Thr Glu Leu Leu Thr Leu Val Asn Arg Lys Val 245 250 255 Ser Gin Arg Arg Val Asp Phe Cys Lys Asp Pro Ser Ala He Gly Lys 260 265 270 Lys Gin Val Pro Cys Phe Ala Ser Met Leu Thr Lys Lys Leu His Phe 275 280 285 Phe Pro Lys Ser Asn 290 (2) INFORMATION FOR SEQ ID NO: 32: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 398 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA ( i) SEQUENCE DESCRIPTION: SEQ ID NO: 32: AAATGCAAAC TGGATGATGA CATGAACCTG CTGGATATTT TCATAGAGAT GGAGAAGAGG 60 GTCATCCTGG GAGAAGGAAA GTTGGACATC CTGAAAAGAG TCTGTGCCCA AATCAACAAG 120 AGCCTGCTGA AGATAATCAA CGACTATGAA GAATTCAGCA AAGGGGAGGA GTTGTGTGGG 180 GTAATGACAA TCTCGGACTC TCCAAGAGAA CAGGATAGTG AATCACAGAC TTTGGACAAA 240 GTTTACCAAA TGAAAAGCAA ACCTCGGGGA TACTGTCTGA TCATCAACAA TCACAATTTT 300 GCAAAAGCAC GGGAGAAAGT GCCCAAACTT CACAGCATTA GGGACAGGAA TGGAACACAC 360 TTGGATGCAG GGTTTGAGAA TGTTTTTAGC TGGTGGCA 398 (2) INFORMATION FOR SEQ ID NO: 33: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1443 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 33: CCAAATGCAA ACTGGATGAT GACATGAACC TGCTGGATAT TTTCATAGAG ATGGAGAAGA 60 GGGTCATCCT GGGAGAAGGA AAGTTGGACA TCCTGAAAAG AGTCTGTGCC CAAATCAACA 120 AGAGCCTGCT GAAGATAATC AACGACTATG AAGAATTCAG CAAAGACTTT GGACAAAGTT 180 TACCAAATGA AAAGCAAACC TCGGGGATAC TGTCTGATCA TCAACAATCA CAATTTTGCA 240 AAAGCACGGG AGAAAGTGCC CAAACTTCAC AGCATTAGGG ACAGGAATGG AACACACTTG 300 GATGCAGGGG CTTTGACCAC GACCTTTGAA GAGCTTCATT TTGAGATCAA GCCCCACGAT 360 GACTGCACAG TAGAGCAAAT CTATGAGATT TGGAAAATCT ACCAACTCAT GGACCACAGT 420 AACATGGACT GCTTCATCTG CTGTATCCTC TCCCATGGAG ACAAAGGCAT CATCTATGGC 480 ACTGATGGAC AGGAGGGCCC CATCTATGAG CTGACATCTC AGTTCACTGG TTTGAAGTGC 5 0 CCTTCCCTTG CTGGAAAACC CAAAGTGTTT TTTATTCAGG CTTGTCAGGG GGATAACTAC 600 CAGAAAGGTA TACCTGTTGA GACTGATTCA GAGGAGCAAC CCTATTTAGA AATGGATTTA 660 TCATCACCTC AAACGAGATA TATCCCGGAT GAGGCTGACT TTCTGCTGGG GATGGCCACT 720 GTGAATAACT GTGTTTCCTA CCGAAACCCT GCAGAGGGAA CCTGGTACAT CCAGTCACTT 780 TGCCAGAGCC TGAGAGAGCG ATGTCCTCGA GGCGATGATA TTCTCACCAT CCTGACTGAA 840 GTGAACTATG AAGTAAGCAA CAAGGATGAC AAGAAAAACA TGGGGAAACA GATGCCTCAG 900 CCTACTTTCA CACTAAGAAA AAAACTTGTC TTCCCTTCTG ATTGATGGTG CTATTTTGTT 960 TGTTTTGTTT TGTTTTGTTT TTTTGAGACA GAATCTCGCT CTGTCGCCCA GGCTGGAGTG 1020 CAGTGGCGTG ATCTCGGCTC ACCGCGAGCT CCGCCTCCCG GGTTCACGCC ATTCTCCTGC 1080 CTCAGCCTCC CGAGTAGCTG GGACTACAGG GGCCCGCCAT CACACCTGGC TAATTTTTTA 1140 AAAATATTTT TAGTAGAGAC AGGGTTTCAC TGTGTTAGCC AGGGTGGTCT TGATCTCCTG 1200 ACCTCGTGAT CCACCCACCT CGGCCTCCCA AAGTGCTGGG ATTACAGGCG TGAGCCACCG 1260 CGCCTGGCCG ATGGTACTAT TTAGATATAA CACTATGTTT ATTTACTAAT TTTCTAGATT 1320 TTCTACTTTA TTAATTGTTT TGCACTTTTT TATAAGAGCT AAAGTTAAAT AGGATATTAA 1380 CAACAATAAC ACTGTCTCCT TTCTCTTACG CTTAAGGCTT TGGGAATGTT TTTAGCTGGT 1440 GGC 1443 (2) INFORMATION FOR SEQ ID NO: 34: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 91 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 34: Lys Cys Lys Leu Asp Asp Asp Met Asn Leu Leu Asp He Phe He Glu 1 5 10 15 Met Glu Lys Arg Val He Leu Gly Glu Gly Lys Leu Asp He Leu Lys 20 25 30 Arg Val Cys Ala Gin He Asn Lys Ser Leu Leu Lys He He Asn Asp 35 40 45 Tyr Glu Glu Phe Ser Lys Asp Phe Gly Gin Ser Leu Pro Asn Glu Lys 50 55 60 Gin Thr Ser Gly He Leu Ser Asp His Gin Gin Ser Gin Phe Cys Lys 65 70 75 80 Ser Thr Gly Glu Ser Ala Gin Thr Ser Gin His 85 90

Claims: CLAIMS 1. A DNA sequence encoding a protein, or fragments and analogs thereof, said protein, or fragments and analogs thereof capable of binding to or interacting with MORT-l protein, and mediating the intracellular effect mediated by the FAS-R or p55-TNF-R. 2. A DNA sequence according to claim 1 selected from the group consisting of : (a) a cDNA sequence encoding a native MORT-l binding protein; (b) DNA sequences capable of hybridization to a sequence of (a) under moderately stringent conditions and which encode a biologically active MORT-l binding protein; and (c) DNA εequenceε which are degenerate aε a result of the genetic code to the DNA sequences defined in (a) and (b) and which encode a biologically active MORT-l binding protein. 3. A DNA sequence according to claim 1 comprising at leaεt part of the εequence of SEQ ID NO:4 and encoding at least one isoform of the MACH protein selected from the herein designated MACH isoforms MACHαl, MACHα2, MACHc-3, MACHjSl, MACH32, MACH03, MACHjS4 and MACH05, and fragments and analogs thereof . 4. A DNA sequence according to claim 3 encoding a MACH isoform selected from MACHαl, MACHβl and MACHjS3 having amino acid sequences SEQ ID NO:7, SEQ ID NO:5 and SEQ ID NO:8, respectively, and fragments and analogs thereof. 5. A DNA sequence according to claim 4 encoding MACHαl having the amino acid sequence of SEQ ID NO:7, fragments and analogs thereof . 6. A DNA seguence according to claim 4 encoding MACH31 having the amino acid sequence of SEQ ID NO: 5, fragmentε and analogε thereof. 7. A DNA sequence according to claim 4 encoding MACH33 having the amino acid sequence SEQ ID NO: 8, fragments and analogε thereof . 8. A vector comprising a DNA sequence according to any one of claims 1-7. 9. A vector according to claim 8 capable of being expressed in a eukaryotic host cell. 10. A vector according to claim 8 capable of being expressed in a prokaryotic host cell . 11. Transformed eukaryotic or prokaryotic host cells containing a vector according to claim 8. 12. A MORT-l-binding protein, fragmentε, or functional analogε or derivativeε thereof capable of binding to or interacting with MORT-l and mediating the intracellular effect mediated by the FAS-R or p55-TNF-R. 13. A MORT-l-binding protein, fragments, analog and derivatives thereof according to claim 12, wherein said protein, analogs, fragments and derivatives are of at least one isoform of MACH selected from MACHαl, MACHα2, MACHα3, MACHjSl, MACH32, MACH03 , MACHj84 , and MACH/35. 14. A MACH isoform according to claim 13 selected from MACHαl, MACH/Jl, and MACH/33 having an amino acid sequences SEQ ID NO:7, SEQ ID NO:5, and SEQ ID NO:8, respectively, and fragments, analogs and derivatives thereof. 15. MACHαl having the amino acid sequence of SEQ ID NO:7, fragments, analogs and derivatives thereof. 16. MACH/31 having the amino acid sequence of SEQ ID NO:5, fragments, analogs and derivatives thereof. 17. MACHjS3 having the amino acid εequence of SEQ ID NO:8, fragments, analogs, and derivatives thereof. 18. A method for producing the MORT-l-binding protein, fragments, analogs or derivatives thereof, comprising growing the tranεformed host cells according to claim 11 under conditions suitable for the expresεion of said protein, analogs or derivatives, effecting post-tranεlational modificationε aε neceεsary for obtaining of said protein, fragments, analogs or derivatives and isolating εaid expreεεed protein, fragmentε, analogε or derivativeε. 19. Antibodieε or active fragments or derivatives thereof, specific for the MORT-l-binding protein, fragments, analogs or derivatives according to any one of claims 12-17. 20. A method for the modulation of the FAS-R ligand or TNF effect on cells carrying a FAS-R or p55-R, compriεing treating said cellε with one or more MORT-l-binding proteinε, analogε, fragments or derivatives according to claim 12, capable of binding to MORT-l, which binds to the intracellular domain of FAS-R, or capable of binding to MORT-l which binds to TRADD which binds to the intracellular domain of p55-R and thereby being capable of modulating/mediating the activity of said FAS-R or p55 TNF-R, wherein said treating of said cells comprises introducing into said cells εaid one or more proteinε, analogε, fragmentε or derivatives in a form suitable for intracellular introduction thereof, or introducing into said cells a DNA sequence encoding said one or more proteins, analogs, fragments or derivatives in the form of a suitable vector carrying said sequence, said vector being capable of effecting the insertion of said sequence into said cells in a way that said sequence is expressed in said cells. 21. A method for the modulation of the FAS-R ligand or TNF effect on cells according to claim 20, wherein said treating of cells comprises introducing into said cells said MORT-l-binding protein, analogs, fragments or derivatives, a DNA sequence encoding said MORT-l-binding protein, analogs, fragments or derivatives in the form of a suitable vector carrying said sequence, said vector being capable of effecting the inεertion of said sequence into said cells in a way that said sequence is expressed in said cells. 22. A method according to claim 20 or 21 wherein said treating of said cells iε by transfection of said cells with a recombinant animal virus vector comprising the steps of: (a) constructing a recombinant animal virus vector carrying a sequence encoding a viral surface protein (ligand) that is capable of binding to a εpecific cell surface receptor on the surface of a FAS-R- or p55-R-carrying cell and a second sequence encoding said protein selected from the MORT-1- binding protein, analogs, fragments and derivatives, that when expressed in said cells iε capable of modulating/mediating the activity of said FAS-R or p55-R; and (b) infecting said cells with said vector of (a) . 23. A method for modulating the FAS-R ligand or TNF effect on cells carrying a FAS-R or a p55-R comprising treating said cells with antibodies or active fragments or derivatives thereof, according to claim 19, said treating being by application of a suitable composition containing said antibodies, active fragmentε or derivativeε thereof to said cells, wherein when the MORT-l-binding protein or portions thereof of said cells are exposed on the extracellular surface, said composition is formulated for extracellular application, and when said MORT-l-binding proteins are intracellular said composition is formulated for intracellular application. 24. A method for modulating the FAS-R ligand or TNF effect on cells carrying a FAS-R or p55-R comprising treating said cells with an oligonucleotide sequence encoding an antisense sequence for at least part of the DNA sequence encoding a MORT-l-binding protein according to any one of claims 1-7, said oligonucleotide sequence being capable of blocking the expression of the MORT-l-binding protein. 25. A method according to claim 24 wherein said oligonucleotide sequence is introduced to said cells via a recombinant animal virus vector, wherein said second sequence of said virus encodes said oligonucleotide sequence. 26. A method for treating tumor cells or HIV- infected cells or other diseased cellε, comprising: (a) constructing a recombinant animal virus vector carrying a sequence encoding a viral surface protein capable of binding to a specific tumor cell surface receptor or HIV- infected cell surface receptor or receptor carried by other diseaεed cellε and a εequence encoding a protein εelected from the MORT-l-binding protein, analogε, fragmentε and derivativeε of any one of claims 12-17, that when expressed in said tumor, HIV-infected, or other diseased cell is capable of killing said cell; and (b) infecting said tumor or HIV-infected cells or other diseaεed cells with said vector of (a) . 27. A method for modulating the FAS-R ligand or TNF effect on cellε compriεing applying the ribozyme procedure in which a vector encoding a ribozyme sequence capable of interacting with a cellular mRNA sequence encoding a MORT-1- binding protein according to any one of claims 12-17, is introduced into said cells in a form that permits expression of said ribozyme sequence in said cells, and wherein when said ribozyme sequence is expresεed in said cells it interacts with said cellular mRNA sequence and cleaves said mRNA sequence resulting in the inhibition of expression of said M0RT-1- binding protein in said cells. 28. A method selected from the method according to any one of claims 20-27, wherein said MORT-l-binding protein or said MORT-l-binding protein encoding sequence comprises at least one of the MACH isoforms, analogs, fragments and derivatives of any thereof according to any one of claims 13- 17 which are capable of binding specifically to MORT-l which in turn bindε specifically to FAS-IC, or which are capable of binding to MORT-l which in turn binds to TRADD and which in turn binds to the p55-IC. 29. A method for isolating and identifying proteins, according to any one of claims 12-17, capable of binding to the MORT-l protein, comprising applying the yeast two-hybrid procedure in which a sequence encoding said MORT-l protein is carried by one hybrid vector and seguence from a cDNA or genomic DNA library is carried by the second hybrid vector, the vectors then being uεed to tranεform yeaεt hoεt cells and the positive transformed cells being isolated, followed by extraction of the said second hybrid vector to obtain a sequence encoding a protein which binds to said MORT- 1 protein, said protein being the MORT-l-binding proteins. 30. A method according to any one of claims 20-29 wherein said MORT-l-binding protein is the MACH isoform herein designated MACHαl, analogs, fragments and derivatives thereof. 31. A method according to any one of claims 20-29 wherein said MORT-l-binding protein is the MACH isoform herein designated MACH/31, analogs, fragmentε and derivativeε thereof. 32. A method according to any one of claimε 20-29 wherein said MORT-l-binding protein is the MACH isoform herein designated MACH33, analogs, fragments and derivatives thereof. 33. A pharmaceutical composition for the modulation of the FAS-R ligand- or TNF- effect on cells comprising, as active, ingredient a MORT-l-binding protein according to any one of claims 12-17, its biologically active fragments, analogs, derivativeε or mixtures thereof. 34. A pharmaceutical composition for modulating the FAS-R ligand- or TNF- effect on cells comprising, as active ingredient, a recombinant animal virus vector encoding a protein capable of binding a cell surface receptor and encoding a MORT-l-binding protein or its biologically active fragments or analogs, according to any one of claims 12-17. 35. A pharmaceutical composition for modulating the FAS-R ligand or TNF effect on cells comprising as active ingredient, an oligonucleotide sequence encoding an anti-senεe sequence of the MORT-l-binding protein mRNA sequence according to any one of claims 1-7. 36. A method for the modulation of the M0RT-1- induced effect or MORT-l-binding protein-induced effect on cells comprising treating said cells with MORT-l-binding proteins, analogs, fragments or derivatives thereof or with sequences encoding MORT-l-binding proteins, analogs or fragments thereof, said treatment resulting in the enhancement or inhibition of said MORT-l-mediated effect and thereby also of the FAS-R or p55-R mediated effect. 37. A method according to claim 3.6 wherein said MORT-l-binding protein, analog, fragment or derivative thereof is that part of the MORT-l-binding protein which is specifically involved in binding to MORT-l or MORT-l-binding protein itself, or said MORT-l-binding protein sequence encodes that part of MORT-l-binding protein which is specifically involved in binding to MORT-l or the MORT-1.- binding protein itself. 38. A method according to claim 36 or 37 wherein said MORT-l-binding protein is any one of the MACH isoforms selected from MACHαl, MACH01, and MACH03, said MACH isoforms capable of enhancing the MORT-l -associated effect on cells and thereby also of the FAS-R or p55-R asεociated effect on the cellε. 39. A method according to claim 36 or 37 wherein εaid MORT-l- binding protein iε any one of the MACH iεoformε selected from MACHα2 or MACHα3, said MACH isoforms being capable of inhibiting the activity of MACH isoforms intracellularly and thereby inhibiting the MORT-l-asεociated cellular effect and thereby also of the FAS-R or p55-R asεociated effect on the cellε. 40. A method of modulating apoptotic proceεεeε or programmed cell death processes comprising treating said cells with one or more MORT-l-binding proteins, analogs, fragments or derivatives according to any one of claims 12-17, capable of binding to MORT-l, which binds to the intracellular domain of FAS-R, or capable of binding to MORT-l which binds to TRADD which binds to the intracellular domain of p55-R and thereby being capable of modulating/mediating the activity of said FAS-R or p55 TNF-R, wherein said treating of said cells comprises introducing into said cells said one or more proteins, analogs, fragments or derivatives in a form suitable for intracellular introduction thereof, or introducing into said cells a DNA sequence encoding said one or more proteins, analogs, fragments or derivatives in the form of a suitable vector carrying said sequence, said vector being capable of effecting the insertion of said sequence into said cells in a way that said sequence is expresεed in said cells. 41. A fragment according to claim 12 being a peptide. 42. An inhibitor of the proteolytic activity of a MACH protease, comprising a compound which binds to the protease active site of said MACH protease so as to interfere with the proteolytic activity of said MACH protease. 43. An inhibitor in accordance with claim 42 comprising a peptide having a sequence of at least the four amino acids which are the minimum length peptide substrate for said MACH protease, said peptide further including a moiety which interfereε with the proteolytic activity of said MACH protease.

Inventors: BOLDIN MARK, GOLTSEV YURY V, GONCHAROV TANYA, WALLACH DAVID, BOLDIN, MARK, GOLTSEV, YURY, V., GONCHAROV, TANYA, WALLACH, DAVID
Applicants: BOLDIN MARK, GOLTSEV YURY V, GONCHAROV TANYA, WALLACH DAVID, WEINWURZEL HENRY, YEDA RES & DEV, BOLDIN, MARK, GOLTSEV, YURY, V., GONCHAROV, TANYA, WALLACH, DAVID, WEINWURZEL, HENRY, YEDA RESEARCH AND DEVELOPMENT CO. LTD.
Application year: 1996
Main classification: C07H21
IPC codes: A61K38, A61K45, A61K48, A61P31, A61P35, C07K14, C07K16, C12N5, C12N9, C12N15