STABLY TRANSFECTED CELL LINES EXPRESSING GABA-A RECEPTORS

Abstract: The present invention relates to a stably co-transfected eukaryotic cell line capable of expressing a human GABAA receptor, which receptor comprises the alpha 1 beta 3 gamma 2, alpha 2 beta 3 gamma 2, alpha 5 beta 3 gamma 2, alpha 1 beta 1 gamma 2S, alpha 1 beta 2 gamma 2, alpha 3 beta 3 gamma 2 or alpha 6 beta 3 gamma 2 subunit combination; to membrane preparations derived from cultures thereof; and to the use of the cell line in designing and developing GABAA receptor subtype-selective medicaments.

Description: STABLY TRANSFECTED CELL LINES EXPRESSING GABA-A RECEPTORS This invention concerns a cell line, and in particular relates to a stable cell line capable of expressing human or animal GABA A receptors. The invention further concerns the cloning of novel cDNA sequences encoding particular subunits of the human GABA^ receptor. In addition, the invention relates to the use of the cell line in a screening technique for the design and development of subtype-specific medicaments. Gamma-a ino butyric acid (GABA) is a major inhibitory neurotransmitter in the central nervous system. It mediates fast synaptic inhibition by opening the chloride channel intrinsic to the GABA^ receptor. This receptor comprises a multimeric protein of molecular size 230-270 kDa with specific binding sites for a variety of drugs including benzodiazepines, barbiturates and .-carbolines, in addition to sites for the agonist ligand GABA (for reviews see Stephenson, Biochem. J.. 1988, 249, 21; Olsen and Tobin, Faseb J. , 1990, 4 . , 1469; and Sieghart, Trends in Pharmacol. Sci., 1989, ljD, 407) . Molecular biological studies demonstrate that the receptor is composed of several distinct types of subunit, which are divided into four classes ( , β , )f , and <5) based on their sequence similarities. To date, six types of α (Schofield et al. , Nature (London) . 1987, 328. 221; Levitan et al.. Nature (London) , 1988, 335, 76; Ymer et al. , EMBO J. , 1989, 8 . , 1665; Pritchett & Seeberg, J. Neuroche .. 1990, 5 , 802; Luddens et al.. Nature (London) , 1990, 346. 648; and Khrestchatisky et al. , Neuron. 1989, 3 , 745), three types of β (Ymer et al.. EMBO J.. 1989, 8, 1665), two types of (Ymer et al.. EMBO J.. 1990, , 3261; and Shivers et al.. Neuron. 1989, 3. . 327) and one <5 subunit (Shivers et al. , Neuron. 1989, 3 ./ 327) have been identified. The differential distribution of many of the subunits has been characterised by in situ hybridisation (Sequier et al. , Proc. Natl. Acad. Sci. USA, 1988, 8J5, 7815; Malherbe et al. , J. Neurosci.. 1990, .10, 2330; and Shivers et al. , Neuron, 1989, 3 .. 327) and this has permitted it to be speculated which subunits, by their co-localisation, could theoretically exist in the same receptor complex. Various combinations of subunits have been co- transfected into cells to identify synthetic combinations of subunits whose pharmacology parallels that of bona fide GABA^ receptors in vivo (Pritchett et al. , Science, 1989, 245. 1389; Malherbe et al.. J. Neurosci.. 1990, L0, 2330; Pritchett and Seeberg, J. Neurochem.. 1990, 54 , 1802; and Luddens et al. , Nature (London.. 1990, 346, 648) . This approach has revealed that, in addition to an a and β subunit, either ^ or fo (Pritchett et al. , Nature (London) . 1989, 338 , 582; Ymer et_al . , EMBO J.. 1990, 9 . , 3261; and Malherbe et al. , J. Neurosci. , 1990, 10, 2330) or 3 (Herb et al. , Proc. Natl. Acad. Sci. USA, 1992, 89, 1433; Knoflach et a . , FEBS Lett.. 1991, 293. 191; and Wilson-Shaw et ai. , FEBS Lett. , 1991, 284, 211) is also generally required to confer benzodiazepine sensitivity, and that the benzodiazepine pharmacology of the expressed receptor is largely dependent on the identity of the and subunits present. Receptors containing a 8 subunit (i.e. βδ ) do not appear to bind benzodiazepines (Shivers et a_l . , Neuron, 1989, 3 . , 327) . Combinations of subunits have been identified which exhibit the pharmacological profile of a BZ-^ type receptor or ot__ β\){_ ι Pritchett et al. , Nature (London) . 1989, 338 , 582) , as well as two GABA^ receptors with a novel pharmacology, as?2 2 (Pritchett and Seeberg, _!______ Neurochem.. 1990, J>4., 1802) and . 2 (Luddens et al.. Nature (London) . 1990, 346. 648) . Although the pharmacology of these expressed receptors appears similar to that of those identified in brain tissue by radioligand binding, it has nonetheless not been shown that these receptor subunit combinations exist in vivo. The present invention is concerned with the production of permanently transfected cells containing the GABA A receptor, which will be useful for screening for drugs which act on this receptor. The GABA^ receptor has previously been expressed in Xenopus oocytes (Sigel et al . , Neuron. 1990, f>, 703-711) and in transiently transfected mammalian cells (Pritchett et al. , Science, 1989, 245. 1389-1392) . However, both of those systems involve transient expression and are unsuitable for screening purposes. We have now achieved the stable expression of the receptor. Accordingly, the present invention provides a stably co-transfected eukaryotic cell line capable of expressing a GABA^ receptor, which receptor comprises at least one alpha, one beta and one gamma subunit. This has been achieved by co-transfecting cells with three expression vectors, each harbouring cDNAs encoding for an α, |3 or / GABA^ receptor subunit. In a further aspect, therefore, the present invention provides a process for the preparation of a eukaryotic cell line capable of expressing a GABA^ receptor, which comprises stably co-transfecting a eukaryotic host cell with at least three expression vectors, one such vector harbouring the cDNA sequence encoding for an alpha, another such vector harbouring the cDNA sequence encoding for a beta, and a third such vector harbouring the cDNA sequence encoding for a gamma GABA A receptor subunit. The stable cell-line which is established expresses an aβ GABA A receptor. Each receptor thereby expressed, comprising a unique combination of a , β and X subunits, will be referred to hereinafter as a GABA^ receptor "subunit combination". Pharmacological and electrophysiological data confirm that the recombinant aβft receptor expressed by the cells of the present invention has the properties expected of a native GABA A receptor. Expression of the GABA A receptor may be accomplished by a variety of different promoter- expression systems in a variety of different host cells. The eukaryotic host cells suitably include yeast, insect and mammalian cells. Preferably the eukaryotic cells which can provide the host for the expression of the receptor are mammalian cells. Suitable host cells include rodent fibroblast lines, for example mouse Ltk " , Chinese hamster ovary (CHO) and baby hamster kidney (BHK) ; HeLa; and HE 293 cells. It is necessary to incorporate at least one α, one β and one subunit into the cell line in order to produce the required receptor. Within this limitation, the choice of receptor subunit combination is made according to the type of activity or selectivity which is being screened for. For example, benzodiazepines (designated BZ) represent one class of drugs which act upon the GABA^ receptor. The presence of an α * ! subunit is specific for a class of benzodiazepines having the pharmacology designated BZ-^; whereas 0 * 2 to 05 define different pharmacological profiles, broadly designated as BZ2. The type of β subunit is not critical in defining the class of benzodiazepine, although a β subunit is required. The % subunit is also important in defining BZ selectivity. It is likely that differentiation between α subunit selectivity is conferred by the identity of the particular subunit present. In order to employ this invention most effectively for screening purposes, it is preferable to build up a library of cell lines, each with a different combination of subunits. Typically a library of 5 or 6 cell line types is convenient for this purpose. Preferred subunit combinations include: '' > ' and a e β 1 2 >' especially αi^i^L- In a particular embodiment, the present invention provides a stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the subunit combination. In a further embodiment, the present invention provides a stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the a.2 ~ \ )( subunit combination. In a still further embodiment, the present invention provides a stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the subunit combination. In yet further embodiments, the present invention provides stably co-transfected eukaryotic cell lines capable of expressing human GABA^ receptors comprising the a ,β ~ Y2 and °*6-*3c 2 subunit combinations. The DNAs for the receptor subunits can be obtained from known sources, and are generally obtained as specific nucleotide sequences harboured by a standard cloning vector such as those described, for example, by Maniatis et a_l. in Molecular Cloning, A Laboratory Manual . Cold Spring Harbor Press, New York, 2nd edition, 1989. Preferably the cDNA sequences are derived from the human gene. However, for screening purposes, cDNAs from other species are also suitable, such as bovine or rat DNA. Known sources of GABA A receptor subunit cDNAs are as follows: α-j_ bovine ) Schofield et al. , Nature, 1987, 328 , βl bovine ) 221-227. - human ) Schofield et al. , FEBS Lett. , 1989, 244 , β± human ) 361-364. a*? rat Khrestchatisky et a_l . , J. Neurochem. 1991, 56 , 1717. 2 bovine ) Levitan et al . , Nature, 1988, 335, α 3 bovine ) 76-79. CL A rat Wisden et al . , FEBS Lett. , 1991, 289, 227 A bovine Ymer et al .. FEBS Lett.. 1989, 258. 119-122. etc rat Pritchett and Seeburg, J. Neurochem. , 1990, 54_, 1802-1804 α 6 rat ) Luddens et al.. Nature, 1990, 346, 0.5 bovine ) 648-651. -2 bovine ) Ymer et al .. EMBO J. , 1989, 8 . , 1665-1670, β 2 rat ) . 3 bovine ) β 3 rat ) ?3 human Wagstaff et al . , Am. J. Hum. Genet.. 1991, 49, 330. human ) Ymer et al.. EMBO J. , 1990, 9_ , 3261-3267. j'l rat ) )fl bovine ) Y 2 human Pritchett et al. , Nature, 1989, 338 , 582-585. ^2 bovine Whiting et aj.. , Proc. Natl. Acad. Sci. USA. 1990, .57, 9966-9970. 3 rat Herb et al. , Proc. Natl. Acad. Sci. USA, 1992, 89, 1433; and Knoflach et aJL. , FEBS Lett.. 1991, 293, 191. fo mouse Wilson-Shaw et ai. , FEBS Lett. , 1991, 284 , 211. δ rat Shivers et ai. , Neuron. 1989, 3 . , 327. Certain cDNA sequences encoding various subunits of the human GABA^ receptor have hitherto been unavailable. These include in particular the sequences encoding the a , <*3 - "5, ~6 and ^2 subunits, which nucleotide sequences are accordingly novel. We have now ascertained the cDNA sequences of the a 2 , 0:3, a-- , αg and β 2 subunits of the human GABA^ receptor. These nucleotide sequences, together with the deduced amino acid sequences corresponding thereto, are depicted in Figures 2 to 6 of the accompanying drawings. The present invention accordingly provides in several additional aspects DNA molecules encoding the 2 , 0 * 3, 0:5, αg and β 2 subunits of the human GABA^ receptor comprising all or a portion of the sequences depicted in Figures 2, 3 , 4, 5 and 6 respectively, or substantially similar sequences. The sequencing of the novel cDNA molecules in accordance with the invention can conveniently be carried out by the standard procedure described in accompanying Example 3; or may be accomplished by alternative molecular cloning techniques which are well known in the art, such as those described by Maniatis et ai. in Molecular Cloning. A Laboratory Manual. Cold Spring Harbor Press, New York, 2nd edition, 1989. In another aspect, the invention provides a recombinant expression vector comprising the nucleotide sequence of a GABA^ receptor subunit together with additional sequences capable of directing the synthesis of the said GABA^ receptor subunit in cultures of stably co-transfected eukaryotic cells. The term "expression vectors" as used herein refers to DNA sequences that are required for the transcription of cloned copies of recombinant DNA sequences or genes and the translation of their mRNAs in an appropriate host. Such vectors can be used to express eukaryotic genes in a variety of hosts such as bacteria, blue-green algae, yeast cells, insect cells, plant cells and animal cells. Specifically designed vectors allow the shuttling of DNA between bacteria-yeast, bacteria- plant or bacteria-animal cells. An appropriately constructed expression vector should contain: an origin of replication for autonomous replication in host cells, selective markers, a limited number of useful restriction enzyme sites, a high copy number, and strong promoters. A promoter is defined as a DNA sequence that directs RNA polymerase to bind to DNA and to initiate RNA synthesis. A strong promoter is one which causes mRNAs to be initiated at high frequency. Expression vectors may include, but are not limited to, cloning vectors, modified cloning vectors, specifically designed plasmids or viruses. The term "cloning vector" as used herein refers to a DNA molecule, usually a small plasmid or bacteriophage DNA capable of self-replication in a host organism, and used to introduce a fragment of foreign DNA into a host cell. The foreign DNA combined with the vector DNA constitutes a recombinant DNA molecule which is derived from recombinant technology. Cloning vectors may include plasmids, bacteriophages, viruses and cosmids. The recombinant expression vector in accordance with the invention may be prepared by inserting the nucleotide sequence of the chosen GABA^ subunit into a suitable precursor expression vector (hereinafter referred to as the "precursor vector") using conventional recombinant DNA methodology known from the art. The precursor vector may be obtained commercially, or constructed by standard techniques from known expression vectors. The precursor vector suitably contains a selection marker, typically an antibiotic resistance gene, such as the neomycin or ampicillin resistance gene. The precursor vector preferably contains a neomycin resistance gene, adjacent the SV40 early splicing and polyadenylation region; an ampicillin resistance gene; and an origin of replication, e.g. pBR322 ori. The vector also preferably contains an inducible promoter, such as MMTV-LTR (inducible with dexa ethasone) or metallothionin (inducible with zinc) , so that transcription can be controlled in the cell line of this invention. This reduces or avoids any problem of toxicity in the cells because of the chloride channel intrinsic to the GABA^ receptor. One suitable precursor vector is pMAMneo, available from Clontech Laboratories Inc. (Lee et ai. , Nature. 1981, 294. 228; and Sardet et a,. , Cell, 1989, 56, 271) . Alternatively the precursor vector pMSGneo can be constructed from the vectors pMSG and pSV2neo as described in Example 1 herein. The recombinant expression vector of the present invention is then produced by cloning the GABA A receptor subunit cDNA into the above precursor vector. The required receptor subunit cDNA is subcloned from the vector in which it is harboured, and ligated into a restriction enzyme site, e.g. the Hindlll site, in the polylinker of the precursor vector, for example pMAMneo or pMSGneo, by standard cloning methodology known from the art, and in particular by techniques analogous to those described in Example 1, step (b) herein. Before this subcloning, it is often advantageous, in order to improve expression, to modify the end of a subunit cDNA with additional 5' untranslated sequences, for example by modifying the 5' end of the subunit DNA by addition of 5 ' untranslated region sequences from the α^ subunit DNA. One suitable expression vector of the present invention is illustrated in Fig. 1 of the accompanying drawings, in which R represents the nucleotide sequence of a given alpha, beta or gamma subunit of the GAB ^ receptor, and the remainder of the expression vector depicted therein is derived from the precursor vector pMSGneo and constructed as described in accompanying Example 1, steps (a) and (b) . For each cell line of the present invention, three such vectors will be necessary, one containing an α subunit, one containing a β subunit, and the third containing a subunit. Cells are then co-transfected with the desired combination of three expression vectors. There are several commonly used techniques for transfection of eukaryotic cells in vitro. Calcium phosphate precipitation of DNA is most commonly used (Bachetti et al.. Proc. Natl. Acad. Sci. USA. 1977, 74., 1590-1594; Maitland et al.. Cell. 1977, 14, 133-141), and represents a favoured technique in the context of the present invention. A small percentage of the host cells takes up the recombinant DNA. In a small percentage of those, the DNA will integrate into the host cell chromosome. Because the neomycin resistance gene will have been incorporated into these host cells, they can be selected by isolating the individual clones which will grow in the presence of neomycin. Each such clone is then tested to identify those which will produce the receptor. This is achieved by inducing the production, for example with dexamethasone, and then detecting the presence of receptor by means of radioligand binding. In a further aspect, the present invention provides protein preparations of GAB ^ receptor subunit combinations, especially human GABA^ receptor subunit combinations, derived from cultures of stably transfected eukaryotic cells. The invention also provides preparations of membranes containing subunit combinations of the GABA^ receptor, especially human GA Ap. receptor subunit combinations, derived from cultures of stably transfected eukaryotic cells. In particular, the protein preparations and membrane preparations according to the invention will suitably contain the Q *ι-*'ι,_2L' -■ifi YZ' " wΪ2 or «603 2 subunit combinations of the human GABA A receptor, and will preferably contain a human GABA A receptor consisting of the ~ . 1 β 1 Y 2 ' > "lutes' f ifes ' α 3 * β 3 2S or α 603<^2S subunit combinations. In an especially preferred embodiment, the invention provides cell membranes containing a human GABA A receptor consisting of the α 2- β 3 < 2S' "Sites' or α 603<h2S subunit combinations isolated from stably transfected mouse Ltk ~ fibroblast cells. The cell line, and the membrane preparations therefrom, according to the present invention have utility in screening and design of drugs which act upon the GABA A receptor, for example benzodiazepines, barbiturates, /3-carbolines and neurosteroids. The present invention accordingly provides the use of the cell line described above, and membrane preparations derived therefrom, in screening for and designing medicaments which act upon the GABA A receptor. Of particular interest in this context are molecules capable of interacting selectively with GABA^ receptors made up of varying subunit combinations. As will be readily apparent, the cell line in accordance with the present invention, and the membrane preparations derived therefrom, provide ideal systems for the study of structure, pharmacology and function of the various GABA^ receptor subtypes. The following non-limiting Examples illustrate the present invention. EXAMPLE 1 PREPARATION OF α^^L TRANSFECTED CELLS a) Construction of eukaryotic expression vector pMSGneo The approx. 2500 base pair Hindlll-EcoRI fragment of the vector pMSG (purchased from Pharmacia Biosystems Limited, Milton Keynes, United Kingdom) , containing the gpt structural gene and SV40 polyadenylation signals was replaced by the approx. 2800 base pair Hindlll-EcoRI fragment of pSV2neo (Southern, P.J. and Berg, P.J., Molecular and Applied Genetics, i, 327-341, 1982) containing the neomycin resistance gene Neo r and SV40 polyadenylation signals. The EcoRI and Hindlll sites were then removed by restriction digesting, blunt ending with klenow polymerase, and religating. EcoRI and Hindlll cloning sites were then inserted at the Xhol and Smal sites of the polylinker by conventional techniques using EcoRI and Hindlll linkers. b) Cloning of subunit cDNAs into pMSGneo Bovine α-^ and β GABA^ receptor cDNAs were obtained from the Molecular Neurobiology Unit, MRC Centre, Hills Road, Cambridge (Scholfield, P. et al. Nature. 328, 221-227, 1987). Bovine 2 cDNA was cloned by the method of Whiting, P. et ai. (Proc. Natl. Acad. Sci. USA, 87, 9966-9970, 1990). Bovine a was subcloned from pbGRαsense by digestion with EcoRI, blunt ending the DNA with klenow polymerase, addition of Hindlll linkers by ligation, digestion with Hindlll and ligation into the Hindlll site of pMSGneo. Bovine β was subcloned from pbGRøsense by restriction digestion with EcoRI (partial digestion) , klenow polymerase blunt ending, ligation of Hindlll linkers, restriction digestion with Hindlll and ligation into Hindlll site of pMSGneo. Before subcloning into pMSGneo, the bovine 2 cDNA was modified from the published sequence as follows. The 5' untranslated region of the bovine α-^ cDNA (bases 60-200 of the published sequence) was added to the 5' end of the published ^ 2 sequence by amplifying the ^ untranslated region using polymerase chain reaction, and then subcloning the product into the 5' BamHI (site in the polylinker of the Bluescript Sk ~ cloning vector; Bluescript vector purchased from Stratagene, San Diego, U.S.A.) Hindlll sites of the γ 2 cDNA. The modified 2 cDNA was then subcloned into pMSGneo by digestion with Xbal (site in the polylinker of the cloning vector) , blunt ending with klenow polymerase, ligation of Xhol linkers, digestion with Xhol (site in the polylinker of the cloning vector) , and ligation into Xhol site of pMSGneo. c) Co-transfection of mouse Ltk ~ cells Ltk- cells were obtained from the Salk Institute for Biological Studies, San Diego, California. Cells were grown at 37"C, 5-8% C0 2 , in Modified Eagles Medium containing penicillin, streptomycin and 10% fetal calf serum. The expression vector harbouring the GABA A receptor subunit DNAs for co-transfection was prepared by a standard protocol (Chen, C. and Okayama, H. , BioTechniques, §_, 632-638, 1988) . For co-transfection, Ltk " cells were plated in dishes (approx. 2x10 cells/dish) and grown overnight. The transfection was performed by calcium phosphate precipitation using a kit (purchased from 5 Prime -> 3 Prime Products, Westchester, Pennsylvania) . Co-transfection was performed according to manufacturers' instructions, using 5μg of each subunit DNA construct per 10cm dish of cells. After 2 days in culture the cells were divided 1:8 into culture medium containing lmg/ml neomycin [Geneticin (obtainable from Gibco BRL, Paisley, Scotland, U.K.)]. After a further week the concentration was increased to 1.5mg/ml, and then 2mg/ml 1 week after that. Resistant clones of cells were isolated and subcloned using cloning cylinders. Subclones were analysed using radioligand binding: subclones were grown in 10cm culture dishes, and when confluent changed into culture medium containing lμM dexamethasone (obtainable from Sigma Chemical Company, Poole, Dorset, United Kingdom) . 3-5 days later the cells were harvested, membranes prepared and used for radioligand binding (see Example 2, step (a) below) using the benzodiazepine antagonist H Rol5-1788 (obtained from New England Nuclear, Du Pont (U.K.) Ltd, Stevenage, United Kingdom) . The clone expressing the highest amount of 3 H Rol5-1788 binding was subcloned from a single cell by limiting dilution. The resultant clonal population of cells described below is referred to as population A. EXAMPLE 2 CHARACTERIZATION OF α 1 3 lf j , 2 L TRANSFECTED CELLS a) Radioligand binding The nature of the recombinant a~_β_ιY 2 ι J GABA A receptors prepared as described in Example 1 was addressed by characterization of the benzodiazepine (BZ) binding pharmacology, using the BZ antagonist H Rol5- 1788. For radioligand binding assays, cells which had been induced by culture in dexamethasone containing medium for 3-5 days were scraped off into 50mM Tris, pH7.5, lOOmM NaCl in the form of Tris buffered saline (TBS) and pelleted (20,000rpm, Sorvall RC5C centrifuge) . The cell pellet was resuspended in 50mM Tris, pH7.5, homogenised using an Ultra-Turrax homogeniser and then pelleted as above. This was repeated once more, and the cells then resuspended in TBS (0.4ml per original 10cm dish of cells) . Radioligand binding was performed in 0.1ml final volume TBS, containing 5-15 fmols of 3 H Rol5- 1788 binding sites. After 1 hour incubation on ice the membranes were harvested onto filters using a Brandel cell harvester, washed with cold TBS, and bound radioactivity determined by scintillation counting. The recombinant receptors bound H Rol5-1788 with high affinity (K^ 0.4nM), at levels of up to 200fmols/10cm dish of cells. No binding was seen to either untransfected Ltk- cells, or population A cells which had not been induced by addition of dexamethasone to the culture medium, confirming that the 3 H Rol5-1788 was binding to recombinant GABA A receptors. The 3 H Rol5-1788 binding was inhibited by flunitrazepam, CL218872, FG8205, /3CCM, zolpidem and Rol5-4513, confirming the BZ pharmacology of the recombinant receptor. Since it is established that only GABA A receptors containing an , a β and a Y subunit exhibit BZ binding (Pritchett, D. et ai. , Nature. 338. 582-585, 1989) these data confirm the nature of the recombinant -~ β ~X2 GABA A receptors expressed by population A cells. b) Electrophysiology The nature of the GABA A receptor expressed by population A cells has been extensively characterised by electrophysiological techniques, using whole cell patch clamp. Only cells induced by culture in the presence of dexamethasone showed responses to GABA. Concentration response curves to GABA gave a log EC 50 of 5.2, and a Hill coefficient of 1.9. The response to GABA was potentiated by BZs flunitrazepam and CL218872, by the barbiturate pentobarbitone, and by the steroid alphaxalone. The response to GABA was antagonised by both bicuculline and picrotoxin. All these electrophysiological data confirm that the recombinant GABA A receptor expressed by population A cells has all of the properties expected of a bona fide GABA A receptor. EXAMPLE 3 ISOLATION AND SEQUENCING OF CDNAS ENCODING HUMAN GABA A RECEPTOR α 2 , α 3 , α 5 , α 6 & β 2 SUBUNITS a) cDNA libraries cDNAs were cloned from human foetal brain (α 2 , 3 ) , hippocampal (0:5, β 2 ) and cerebellum (0:5) lambda bacteriophage cDNA libraries. All cDNA libraries were constructed in the lambdaZAP vector, and were purchased from Stratagene (San Diego, California) . For screening, the cDNA libraries were plated according to the manufacturer's instructions, at 40,000 pfu per 137 mm plate. Filter lifts were taken using Hybond N filters (Amersham) according to the manufacturer's instructions. b) Isolation of cDNA encoding human a 2 subunit A bovine a 2 cDNA (obtained from E. Barnard, Molecular Neurobiology, University of Cambridge, Hills Road, Cambridge; Levitan et a . , Nature, 1988, 335, 76) was labelled to high specific activity (>1.10 9 cpm/μg) with P by random priming and used as a probe. Library filters (8 replica filters) were prehybridised for 3-6 hours at 42°C in 5x SSPE (lx SSPE is 0.18M NaCl, 0.01M Na 3 P0 4 [pH7.4], ImM EDTA) , 5x Denhardt's solution, 100 μg/ml salmon sperm DNA, 0.1% sodium dodecyl sulphate (SDS) , 30% formamide. Hybridisation was performed in the same buffer for 18 hours at 42°C, including 0.5-1.10 6 cpm 32 P-labelled probe per ml of hybridisation buffer. Filters were washed at 55"C in 5x SSPE (2x 15 minutes) and lx SSPE (2x 15 minutes) and exposed to Kodak XAR film for 1-3 days. Positive clones were plaque purified using standard techniques, and the Bluescript plasmid (Stratagene) "rescued" according to manufacturer's instructions. cDNA clones were sequenced on both strands by standard techniques using Sequenase II enzyme (United States Biochemicals) . The nucleotide sequence of the cDNA encoding the human GABA A receptor 0: 2 subunit, together with the deduced amino acid sequence corresponding thereto, is shown in Fig. 2 of the accompanying drawings. c) Isolation of cDNA encoding human α 3 subunit A bovine α 3 cDNA (obtained from E. Barnard, Molecular Neurobiology, University of Cambridge, Hills Road, Cambridge; Levitan et aL. , Nature, 1988, 335, 76) was labelled to high specific activity with 32 P by random priming and used as a probe. Library filters were prehybridised for 3-6 hours at 55°C in 5x SSPE, 5x Denhardt's solution, 0.1% SDS, 100 μg/ml salmon sperm DNA, and hybridised for 18 hours, 55°C in the same buffer, containing 0.5-lx 10 6 cpm/ml of 3 P-labelled bovine 0* 3 cDNA as probe. Filters were washed and exposed to X-ray film as described above; cDNA clones were rescued and sequenced as described above. The longest α 3 cDNA clone was missing in approximately 100 bp of the 5' end of the coding region. This was obtained by PCR using as primers an oligonucleotide "anchor" primer derived from the T7 primer sequence of Bluescript vector (5ΑGCGCGCGTAATACGACTCACTATAGGGCGAA3') and an oligonucleotide derived from sequence near the 5' end of the truncated 0: 3 cDNA, containing an internal Hpal site (5*CAGCATGAATTGTTAACCTCATTGTA3 *) . Oligonucleotides were synthesised on an Applied Biosystems 380B synthesiser. PCR was performed as described above, and a 300bp PCR product obtained which was double digested with Hpal and Kpnl and subcloned into the similarly cut truncated α 3 cDNA to yield a full length human 0: 3 cDNA. The cDNA was sequenced on both strands as described above. The nucleotide sequence of the cDNA encoding the human GABA A receptor 0: 3 subunit, together with the deduced amino acid sequence corresponding thereto, is shown in Fig. 3 of the accompanying drawings. d) Isolation of cDNA encoding human (*<- ■ subunit A rat α*5 cDNA obtained by polymerase chain reaction (PCR) was used as a probe to screen the cDNA library. For PCR, sequences of the oligonucleotide primers were taken from the published α 5 sequences (Khrestchatisky et ai. , Neuron. 1989, 3 . , 745) and incorporated a Hind III site for subcloning purposes: 5' ATTATTCAAGCTTGCCATGGACAATGGAATGCTC3' (bpll4-148) ; 5 'GGTTTCCAGCTTACTTTGGAGAGGTAGC3 ' (bpl507-1535) . PCR and subcloning of the PCR product into Bluescript SK-vector (Stratagene) for analysis was performed as described elsewhere (Whiting et ai. , Proc. Natl. Acad. Sci. USA, 1990, jT7, 9966) except that rat brain cDNA was used as template. The rat 0 * 5 cDNA was labelled with 32 P and used to screen the human hippocampal cDNA library, and positive a $ clones rescued and sequenced as described for ct 2 above. The nucleotide sequence of the cDNA encoding the human GABA A receptor 0:5 subunit, together with the deduced amino acid sequence corresponding thereto, is shown in Fig. 4 of the accompanying drawings. e) Isolation of cDNA encoding human αg subunit A rat a - cDNA obtained by PCR was used as a probe to screen the cDNA library. PCR was performed as described above for α 5 , using oligonucleotide primers derived from the published rat α 6 sequence (Luddens et ai. , Nature. 1990, 346. 648) incorporating an EcoRI site for subcloning purposes: 5 'GAGGAAGAATTCAGGAGGGTGACCT3 ' (bp48-72) ; 5 'GAAAATAACGAATTCCAGTGTCCAGCTTT3 ' (bpl376- 1404) . The rat α 6 cDNA clone isolated by PCR was 3_> labelled with P and used to screen a human cerebellum cDNA library, as described above for 2 . Positive 0* 5 clones were purified, rescued and sequenced as described above. None of the cDNAs contained a complete coding region. To obtain a full length cDNA 3 clones were joined together using convenient restriction sites. The nucleotide sequence of the cDNA encoding the human GABA A receptor αg subunit, together with the deduced amino acid sequence corresponding thereto, is shown in Fig. 5 of the accompanying drawings. f) Isolation of cDNA encoding human β 2 subunit Human β 2 cDNA was isolated using as a probe a short human β 2 cDNA obtained by PCR. PCR was performed as described above (except that the human cerebellum cDNA library was used as template) , using oligonucleotide primers derived from the published rat β 2 sequence (Ymer et a . , EMBO J.. 1989, 8 . , 1665) , incorporating EcoRI sites for subcloning purposes: 5' CAAAAGAATTCAGCTGAGAAAGCTGCTAATGC3' (bpl088-1119) ; 5' TCAGGCGAATTCTCTTTTGTGCCACATGTCGTTC3 ' (bpl331-1364) . The human β clone obtained by PCR was radiolabelled with 32 P and used to screen a human hippocampal cDNA library, as described above for a . The largest cDNA clone obtained lacked the 5' 500bp of the coding region of the β 2 subunit. This was obtained by PCR using as primers an oligonucleotide "anchor" primer derived from the T7 primer sequence of the Bluescript vector (5' AGCGCGCGTAATACGACTCACTATAGGGCGAA3 ' ) , and an oligonucleotide derived from sequence near the 5' end of the truncated β 2 cDNA, containing a Kpnl site (5' CATCCAGTGGGTACCTCCTTAGGT3 ' ) . PCR was performed as described above, and a 700bp PCR product obtained which was digested with kpnl and subcloned into the truncated cDNA clone (also Kpnl digested) to yield a full length human β 2 cDNA. The nucleotide sequence of the cDNA encoding the human GABA A receptor β 2 subunit, together with the deduced amino acid sequence corresponding thereto, is shown in Fig. 6 of the accompanying drawings. EXAMPLE 4 PREPARATION OF STABLY TRANSFECTED CELLS EXPRESSING α l ? 3 2S*' α 2 . β 3 J'2S AN* 0 α 5^3^2S SUBUNIT COMBINATIONS OF THE HUMAN GABA A RECEPTOR Isolation and sequence of human a 2 and 0:5 cDNAs have been described in Example 3. The sequence of human α * ! cDNA has been published previously by Schofield et al.. FEBS Lett.. 1989, 244. 361. It differs from the bovine sequence at a single amino acid (trp95 in bovine (_.--_; arg in human α-j . To create a human *^ cDNA the bovine sequence was converted to the human by site directed mutagenesis of amino acid 95 with the oligonucleotide 5*GCAATGAAAATCCGGACTGGCAT3 ' , using methods described elsewhere (K. Wafford and P. Whiting, FEBS Lett. , 1992, 313, 113-117) . The sequence of human ^2 ha been published previously by Pritchett et al.. Nature. 1989, 338. 582. A human 2 cDNA was isolated by PCR using conditions described elsewhere (Whiting et ai. , Proc. Natl. Acad. Sci. USA. 1990, .87, 9966-9970) , using human hippocampal cDNA library as template and oligonucleotide primers derived from the 5' and 3' untranslated regions of the published 2 sequence, incorporating a Hind III restriction site: 5'GGGAGGGAAGCTTCTGCAACCAAGAGGC3 ' , 5ΑCCACATAGAAGCTTATTTAAGTGGAC3' . Sequencing indicated that the form of f used is the short form, 2 S ' lacking the 24 bp insert in the putative cytoplasmic loop region (Whiting et al . , Proc. Natl. Acad. Sci. USA. 1990, 87 , 9966-9970) . The sequence of human β 3 has been published by Wagstaff et al.. Am. J. Hu . Genet. , 1991, 4JL, 330- 337. A human 3 3 cDNA was isolated by screening a human foetal brain cDNA library (see Example 3) with a short human /_ 3 cDNA probe encoding the putative cytoplasmic loop domain which had been obtained using PCR. Human a l r 2 , α 5 , β 3 and Y 2 S cDNAs were subcloned into the eukaryotic expression vector pMSGneo (see Example 1) using standard techniques (cf. Maniatis et al. in Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Press, New York, 2nd Edition, 1989) and stable cell lines expressing human α-it-^^ S ' α 2- β 3 *i' 2S and 53 3 2s CABA A receptors were established as described in Example 1. EXAMPLE 5 PREPARATION OF STABLY TRANSFECTED CELLS EXPRESSING SUBUNIT COMBINATIONS OF THE HUMAN GABA A RECEPTOR Isolation of 03 and α cDNAs is as described in Example 3, and isolation of α* j _, β 3 and Y 2 <- cDNAs is as described above in Example 4. Human β^ subunit cDNA was isolated by PCR from human brain cDNA as described above. Oligonucleotide primers used for the PCR were derived from the published human β^ sequence (Schofield et al . , FEBS Lett. , 1989, 244, 361-364), 5' and 3' untranslated regions incorporating Hind III restriction enzyme sites for subcloning:- 5 'TAATCAAGCTTAGTAATGTGGACAGTACAAAAT3 ' and 5ΑAATGGAAGCTTTAGAACAGACCTCAGTGTACA3 ' . Human l r α 3 , α 6 , β- , β 2 , -3 and 2 S cDNAs were subcloned into the eukaryotic expression vector pMSGneo (see Example 1) using standard techniques (cf. Maniatis et al . in Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Press, New York, 2nd Edition, 1989) and stable cell lines expressing human a ~ _βι_Y2S > a - ~ fi2 f2S > " α 3**'3 < J''2S and α 6' 3 3<)2 S GABA A receptors were established as described in Example 1. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: (A) NAME: Merck Sharp & Dohme Limited (B) STREET: Hertford Road (C) CITY: Hoddesdon (D) STATE: Hertfordshire (E) COUNTRY: England (F) POSTAL CODE (ZIP) : EN11 9BU (ii) TITLE OF INVENTION: Stably transfected cell lines expressing GABA-A receptors (iii) NUMBER OF SEQUENCES: 10 (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 #1.25 (EPO) (2) INFORMATION FOR SEQ ID NO: 1: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2310 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA ( ix) FEATURE : (A) NAME/KEY: CDS (B) LOCATION: 298..1683 (Xi) SEQUENCE DESCRIPTION: SEQ ID NO: 1: GAATTCCCCC CTTGCAGGCC GAGCCGGGGC CCTGCGCCCT CCCCCTCCGC CCAGCTCGGC 60 CAAGGGCGCA TTTGCTGAGC GTCTGGCGGC CTCTACCGGA GCACCTCTGC AGAGGGCCGA 120 TCCTCCAGCC CAGAGACGAC ATGTGGCGCT CGGGCGAGTG CCTTGCAGAG AGAGGAGTAG 180 CTTGCTGGCT TTGAACGCGT GGCGTGGCAG ATATTTCAGA AAGCTTCAAG AACAAGCTGG 2.0 AGAAGGGAAG AGTTATTCCT CCATATTCAC CTGCTTCAAC TACTATTCTT ATTGGGA 297 ATG GAC AAT GGA ATG TTC TCT GGT TTT ATC ATG ATC AAA AAC CTC CTT 345 Met Asp Asn Gly Met Phe Ser Gly Phe lie Met lie Lys Asn Leu Leu 1 5 10 15 CTC TTT TGT ATT TCC ATG AAC TTA TCC AGT CAC TTT GGC TTT TCA CAG 393 Leu Phe Cys lie Ser Met Asn Leu Ser Ser His Phe Gly Phe Ser Gin 20 25 30 ATG CCA ACC AGT TCA GTG AAA GAT GAG ACC AAT GAC AAC ATC ACG ATA 441 Met Pro Thr Ser Ser Val Lys Asp Glu Thr Asn Asp Asn He Thr lie 35 40 45 TTT ACC AGG ATC TTG GAT GGG CTC TTG GAT GGC TAC GAC AAC AGA CTT 489 Phe Thr Arg He Leu Asp Gly Leu Leu Asp Gly Tyr Asp Asn Arg Leu 50 55 60 CGG CCC GGG CTG GGA GAG CGC ATC ACT CAG GTG AGG ACC GAC ATC TAC 537 Arg Pro Gly Leu Gly Glu Arg He Thr Gin Val Arg Thr Asp He Tyr 65 70 75 80 GTC ACC AGC TTC GGC CCG GTG TCC GAC ACG GAA ATG GAG TAC ACC ATA 585 Val Thr Ser Phe Gly Pro Val Ser Asp Thr Glu Met Glu Tyr Thr He 85 90 95 GAC GTG TTT TTC CGA CAA AGC TGG AAA GAT GAA AGG CTT CGG TTT AAG 633 Asp Val Phe Phe Arg Gin Ser Trp Lys Asp Glu Arg Leu Arg Phe Lys 100 105 110 GGG CCC ATG CAG CGC CTC CCT CTC AAC AAC CTC CTT GCC AGC AAG ATC 681 Gly Pro Met Gin Arg Leu Pro Leu Asn Asn Leu Leu Ala Ser Lys He 115 120 125 TGG ACC CCA GAC ACG TTC TTC CAC AAC GGG AAG AAG TCC ATC GCT CAC 729 Trp Thr Pro Asp Thr Phe Phe His Asn Gly Lys Lys Ser He Ala His 130 135 140 AAC ATG ACC ACG CCC AAC AAG CTG CTG CGG CTG GAG GAC GAC GGC ACC 777 Asn Met Thr Thr Pro Asn Lys Leu Leu Arg Leu Glu Asp Asp Gly Thr 145 150 155 160 CTG CTC TAC ACC ATG CGC TTG ACC ATC TCT GCA GAG TGC CCC ATG CAG 825 Leu Leu Tyr Thr Met Arg Leu Thr He Ser Ala Glu Cys Pro Met Gin 165 170 175 CTT GAG GAC TTC CCG ATG GAT GCG CAC GCT TGC CCT CTG AAA TTT GGC 873 Leu Glu Asp Phe Pro Met Asp Ala His Ala Cys Pro Leu Lys Phe Gly 180 185 190 AGC TAT GCG TAC CCT AAT TCT GAA GTC GTT TAC GTC TGG ACC AAC GGC 921 Ser Tyr Ala Tyr Pro Asn Ser Glu Val Val Tyr Val Trp Thr Asn Gly 195 200 205 TCC ACC AAG TCG GTG GTG GTG GCG GAA GAT GGC TCC AGA CTG AAC CAG 969 Ser Thr Lys Ser Val Val Val Ala Glu Asp Gly Ser Arg Leu Asn Gin 210 215 220 TAC CAC CTG ATG GGG CAG ACG GTG GGC ACT GAG AAC ATC AGC ACC AGC 1017 Tyr His Leu Met Gly Gin Thr Val Gly Thr Glu Asn He Ser Thr Ser 225 230 235 240 ACA GGC GAA TAC ACA ATC ATG ACA GCT CAC TTC CAC CTG AAA AGG AAG 1065 Thr Gly Glu Tyr Thr He Met Thr Ala His Phe His Leu Lys Arg Lys 245 250 255 ATT GGC TAC TTT GTC ATC CAG ACC TAC CTT CCC TGC ATA ATG ACC GTG 1113 He Gly Tyr Phe Val He Gin Thr Tyr Leu Pro Cys He Met Thr Val 260 265 270 ATC TTA TCA CAG GTG TCC TTT TGG CTG AAC CGG GAA TCA GTC CCA GCC 1161 He Leu Ser Gin Val Ser Phe Trp Leu Asn Arg Glu Ser Val Pro Ala 275 280 285 AGG ACA GTT TTT GGG GTC ACC ACG GTG CTG ACC ATG ACG ACC CTC AGC 1209 Arg Thr Val Phe Gly Val Thr Thr Val Leu Thr Met Thr Thr Leu Ser 290 295 300 ATC AGC GCC AGG AAC TCT CTG CCC ΛAA GTG GCC TAC GCC ACC GCC ATG 1257 He Ser Ala Arg Asn Ser Leu Pro Lys Val Ala Tyr Ala Thr Ala Met 305 310 315 320 GAC TGG TTC ATA GCT GTG TGC TAT GCC TTC GTC TTC TCG GCG CTG ATA 1305 Asp Trp Phe He Ala Val Cys Tyr Ala Phe Val Phe Ser Ala Leu He 325 330 335 GAG TTT GCC ACG GTC AAT TAC TTT ACC AAG AGA GGC TGG GCC TGG GAT 1353 Glu Phe Ala Thr Val Asn Tyr Phe Thr Lys Arg Gly Trp Ala Trp Asp 340 345 350 GGC AAA AAA GCC TTG GAA GCA GCC AAG ATC AAG AAA AAG CGT GAA GTC 1401 Gly Lys Lys Ala Leu Glu Ala Ala Lys He Lys Lys Lys Arg Glu Val 355 360 365 ATA CTA AAT AAG TCA ACA AAC GCT TTT ACA ACT GGG AAG ATG TCT CAC 1449 He Leu Asn Lys Ser Thr Asn Ala Phe Thr Thr Gly Lys Met Ser His 370 375 380 CCC CCA AAC ATT CCG AAG GAA CAG ACC CCA GCA GGG ACG TCG AAT ACA 1497 Pro Pro Asn He Pro Lys Glu Gin Thr Pro Ala Gly Thr Ser Asn Thr 385 390 395 400 ACC TCA GTC TCA GTA AAA CCC TCT GAA GAG AAG ACT TCT GAA AGC AAA 1545 Thr Ser Val Ser Val Lys Pro Ser Glu Glu Lys Thr Ser Glu Ser Lys 405 410 415 AAG ACT TAC AAC AGT ATC AGC AAA ATT GAC AAA ATG TCC CGA ATC GTA 1593 Lys Thr Tyr Asn Ser He Ser Lys He Asp Lys Met Ser Arg He Val 420 425 430 TTC CCA GTC TTG TTC GGC ACT TTC AAC TTA GTT TAC TGG GCA ACG TAT 1641 Phe Pro Val Leu Phe Gly Thr Phe Asn Leu Val Tyr Trp Ala Thr Tyr 435 440 445 TTG AAT AGG GAG CCG GTG ATA AAA GGA GCC GCC TCT CCA AAA 1683 Leu Asn Arg Glu Pro Val He Lys Gly Ala Ala Ser Pro Lys 450 455 460 TAACCGGCCA CACTCCCAAA CTCCAAGACA GCCATACTTC CAGCGAAATG GTACCAAGGA 1743 GAGGTTTTGC TCACAGGGAC TCTCCATATG TGAGCACTAT CTTTCAGGAA ATTTTTGCAT 1803 GTTTAATAAT ATGTACAAAT AATATTGCCT TGATGTTTCT ATATGTAACT TCAGATGTTT 1863 CCAAGATGTC CCATTGATAA TTCGAGCAAA CAACTTTCTG GAAAAACAGG ATACGATGAC 1923 TGACACTCAG ATGCCCAGTA TCATACGTTG ATAGTTTACA AACAAGATAC GTATATTTTT 1983 AACTGCTTCA AGTGTTACCT AACAATGTTT TTTATACTTC AAATGTCATT TCATACAAAT 2043 TTTCCCAGTG AATAAATATT TTAGGAAACT CTCCATGATT ATTAGAAGAC CAACTATATT 2103 GCGAGAAACA GAGATCATAA AGAGCACGTT TTCCATTATG AGGAAACTTG GACATTTATG 2163 TACAAAATGA ATTGCCTTTG ATAATTCTTA CTGTTCTGAA ATTAGGAAAG TACTTGCATG 2223 ATCTTACACG AAGAAATAGA ATAGGCAAAC TTTTATGTAG GCAGATTAAT AACAGAAATA 2283 CATCATATGT TAGATACACA AAATATT 2310 (2) INFORMATION FOR SEQ ID NO: 2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 462 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 2 Met Asp Asn G ly Met Phe Ser Gly Phe He Met He Lys Asn Leu Leu 1 5 10 15 Leu Phe Cys He Ser Met Asn Leu Ser Ser H i s Phe Gly Phe Ser Gin 20 25 30 Met Pro Thr Ser Ser Val Lys Asp Glu Thr Asn Asp Asn He Thr He 35 40 45 Phe Thr Arg He Leu Asp Gly Leu Leu Asp Gly Tyr Asp Asn Arg Leu 50 55 60 Arg Pro Gly Leu Gly Glu Arg He Thr Gin Val Arg Thr Asp He Tyr 65 70 75 80 Val Thr Ser Phe Gly Pro Val Ser Asp Thr Glu Met Glu Tyr Thr He 85 90 95 Asp Val Phe Phe Arg Gin Ser Trp Lys Asp Glu Arg Leu Arg Phe Lys 100 105 110 Gly Pro Met Gin Arg Leu Pro Leu Asn Asn Leu Leu Ala Ser Lys He 115 120 125 Trp Thr Pro Asp Thr Phe Phe His Asn Gly Lys Lys Ser He Ala His 130 135 140 Asn Met Thr Thr Pro Asn Lys Leu Leu Arg Leu Glu Asp Asp Gly Thr 145 150 155 160 Leu Leu Tyr Thr Met Arg Leu Thr He Ser Ala Glu Cys Pro Met Gin 165 170 175 Leu Glu Asp Phe Pro Met Asp Ala His Ala Cys Pro Leu Lys Phe Gly 180 185 190 Ser Tyr Ala Tyr Pro Asn Ser Glu Val Val Tyr Val Trp Thr Asn Gly 195 200 205 Ser Thr Lys Ser Val Val Val Ala Glu Asp Gly Ser Arg Leu Asn Gin 210 215 220 Tyr His Leu Met Gly Gin Thr Val Gly Thr Glu Asn He Ser Thr Ser 225 230 235 240 Thr Gly Glu Tyr Thr He Met Thr Ala His Phe His Leu Lys Arg Lys 245 250 255 He Gly Tyr Phe Val He Gin Thr Tyr Leu Pro Cys He Met Thr Val 260 265 270 He Leu Ser Gin Val Ser Phe Trp Leu Asn Arg Glu Ser Val Pro Ala 275 280 285 Arg Thr Val Phe Gly Val Thr Thr Val Leu Thr Met Thr Thr Leu Ser 290 295 300 He Ser Ala Arg Asn Ser Leu Pro Lys Val Ala Tyr Ala Thr Ala Met 305 310 315 320 Asp Trp Phe He Ala Val Cys Tyr Ala Phe Val Phe Ser Ala Leu He 325 330 335 Glu Phe Ala Thr Val Asn Tyr Phe Thr Lys Arg Gly Trp Ala Trp Asp 340 345 350 Gly Lys Lys Ala Leu Glu Ala Ala Lys He Lys Lys Lys Arg Glu Val 355 360 365 He Leu Asn Lys Ser Thr Asn Ala Phe Thr Thr Gly Lys Met Ser His 370 375 380 Pro Pro Asn He Pro Lys Glu Gin Thr Pro Ala Gly Thr Ser Asn Thr 385 390 395 400 Thr Ser Val Ser Val Lys Pro Ser Glu Glu Lys Thr Ser Glu Ser Lys 405 410 415 Lys Thr Tyr Asn Ser He Ser Lys He Asp Lys Met Ser Arg He Val 420 425 430 Phe Pro Val Leu Phe Gly Thr Phe Asn Leu Val Tyr Trp Ala Thr Tyr 435 440 445 Leu Asn Arg Glu Pro Val He Lys Gly Ala Ala Ser Pro Lys 450 455 460 (2) INFORMATION FOR SEQ ID NO: 3: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1408 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 27..1385 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 3 AATTCTGCAT TTCAGTGCAC TGCAGG ATG GCG TCA TCT CTG CCC TGG CTG TGC 53 Met Ala Ser Ser Leu Pro Trp Leu Cys 1 5 ATT ATT CTG TGG CTA GAA AAT GCC CTA GGG AAA CTC GAA GTT GAA GGC 101 He He Leu Trp Leu Glu Asn Ala Leu Gly Lys Leu Glu Val Glu Gly 10 15 20 25 AAC TTC TAC TCA GAA AAC GTC AGT CGG ATC CTG GAC AAC TTG CTT GAA 149 Asn Phe Tyr Ser Glu Asn Val Ser Arg He Leu Asp Asn Leu Leu Glu 30 35 40 GGC TAT GAC AAT CGG CTG CGG CCG GGA TTT GGA GGT GCT GTC ACT GAA 197 Gly Tyr Asp Asn Arg Leu Arg Pro Gly Phe Gly Gly Ala Val Thr Glu 45 50 55 GTC AAA ACA GAC ATT TAT GTG ACC AGT TTT GGG CCC GTG TCA GAT GTG 245 Val Lys Thr Asp He Tyr Val Thr Ser Phe Gly Pro Val Ser Asp Val 60 65 70 GAG ATG GAG TAT ACG ATG GAT GTT TTT TTT CGC CAG ACC TGG ACT GAT 293 Glu Met Glu Tyr Thr Met Asp Val Phe Phe Arg Gin Thr Trp Thr Asp 75 80 85 GAG AGG TTG AAG TTT GGG GGG CCA ACT GAG ATT CTG AGT CTG ΛAT AAT 341 Glu Arg Leu Lys Phe Gly Gly Pro Thr Glu He Leu Ser Leu Asn Asn 90 95 100 105 TTG ATG GTC AGT AAA ATC TGG ACG CCT GAC ACC TTT TTC AGA AAT GGT 389 Leu Met Val Ser Lys He Trp Thr Pro Asp Thr Phe Phe Arg Asn Gly 110 115 120 AAA AAG TCC ATT GCT CAC AAC ATG ACA ACT CCT AAT AAA CTC TTC AGA 437 Lys Lys Ser He Ala His Asn Met Thr Thr Pro Asn Lys Leu Phe Arg 125 130 135 ATA ATG CAG AAT GGA ACC ATT TTA TAC ACC ATG AGG CTT ACC ATC AAT 485 He Met Gin Asn Gly Thr He Leu Tyr Thr Met Arg Leu Thr He Asn 140 145 150 GCT GAC TGT CCC ATG AGG CTG GTT AAC TTT CCT ATG GAT GGG CAT GCT 533 Ala Asp Cys Pro Met Arg Leu Val Asn Phe Pro Met Asp Gly His Ala 155 160 165 TGT CCA CTC AAG TTT GGG AGC TAT GCT TAT CCC AAA AGT GAA ATC ATA 581 Cys Pro Leu Lys Phe Gly Ser Tyr Ala Tyr Pro Lys Ser Glu He He 170 175 180 185 TAT ACG TGG AAA AAA GGA CCA CTT TAC TCA GTA GAA GTC CCA GAA GAA 629 Tyr Thr Trp Lys Lys Gly Pro Leu Tyr Ser Val Glu Val Pro Glu Glu 190 195 200 TCT TCA AGC CTT CTC CAG TAT GAT CTG ATT GGA CAA ACA GTA TCT AGT 677 Ser Ser Ser Leu Leu Gin Tyr Asp Leu He Gly Gin Thr Val Ser Ser 205 210 215 GAG ACA ATT AAA TCT AAC ACA GGT GAA TAC GTT ATA ATG ACA GTT TAC 725 Glu Thr He Lys Ser Asn Thr Gly Glu Tyr Val He Met Thr Val Tyr 220 225 230 TTC CAC TTG CAA AGG AAG ATG GGC TAC TTC ATG ATA CAG ATA TAC ACT 773 Phe His Leu Gin Arg Lys Met Gly Tyr Phe Met He Gin He Tyr Thr 235 240 245 CCT TGC ATT ATG ACA GTC ATT CTT TCC CAG GTG TCT TTC TGG ATT AAT 821 Pro Cys He Met Thr Val He Leu Ser Gin Val Ser Phe Trp He Asn 250 255 260 265 AAG GAG TCC GTC CCA GCA AGA ACT GTT CTT GGG ATC ACC ACT GTT TTA 869 Lys Glu Ser Val Pro Ala Arg Thr Val Leu Gly He Thr Thr Val Leu 270 275 280 ACT ATG ACC ACT TTG AGC ATC AGT GCC CGG CAC TCT TTG CCA AAA GTG 917 Thr Met Thr Thr Leu Ser He Ser Ala Arg His Ser Leu Pro Lys Val 285 290 295 TCA TAT GCC ACT GCC ATG GAT TGG TTC ATA GCT GTT TGC TTT GCA TTC 965 Ser Tyr Ala Thr Ala Met Asp Trp Phe He Ala Val Cys Phe Ala Phe 300 305 310 GTC TTC TCT GCT CTT ATC GAG TTC GCA GCT GTC AAC TAC TTT ACC AAT 1013 Val Phe Ser Ala Leu He Glu Phe Ala Ala Val Asn Tyr Phe Thr Asn 315 320 325 CTT CAG ACA CAG AAG GCG AAA AGG AAG GCA CAG TTT GCA GCC CCA CCC 1061 Leu Gin Thr Gin Lys Ala Lys Arg Lys Ala Gin Phe Ala Ala Pro Pro 330 335 340 345 ACA GTG ACA ATA TCA AAA GCT ACT GAA CCT TTG GAA GCT GAG ATT GTT 1109 Thr Val Thr He Ser Lys Ala Thr Glu Pro Leu Glu Ala Glu He Val 350 355 360 TTG CAT CCT GAC TCC AAA TAT CAT CTG AAG AAA AGG ATC ACT TCT CTG 1157 Leu His Pro Asp Ser Lys Tyr His Leu Lys Lys Arg He Thr Ser Leu 365 370 375 TCT TTG CCA ATA GTT TCA TCT TCC GAG GCC AAT AAA GTG CTC ACG AGA 1205 Ser Leu Pro He Val Ser Ser Ser Glu Ala Asn Lys Val Leu Thr Arg 380 385 390 GCG CCC ATC TTA CAA TCA ACA CCT GTC ACA CCC CCA CCA CTC CCG CCA 1253 Ala Pro He Leu Gin Ser Thr Pro Val Thr Pro Pro Pro Leu Pro Pro 395 400 405 GCC TTT GGA GGC ACC AGT AAA ATA GAC CAG TAT TCT CGA ATT CTC TTC 1301 Ala Phe Gly Gly Thr Ser Lys He Asp Gin Tyr Ser Arg He Leu Phe 410 415 420 425 CCA GTT GCA TTT GCA GGA TTC AAC CTT GTG TAC TGG GTA GTT TAT CTT 1349 Pro Val Ala Phe Ala Gly Phe Asn Leu Val Tyr Trp Val Val Tyr Leu 430 435 440 TCC AAA GAT ACA ATG GAA GTG AGT AGC AGT GTT GAA TAGCTTTTCC 1395 Ser Lys Asp Thr Met Glu Val Ser Ser Ser Val Glu 445 450 AGGACAACCT GAA 1408 (2) INFORMATION FOR SEQ ID NO: 4: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 453 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 4: Met Ala Ser Ser Leu Pro Trp Leu Cys He He Leu Trp Leu Glu Asn 1 5 10 15 Ala Leu Gly Lys Leu Glu Val Glu Gly Asn Phe Tyr Ser Glu Asn Val 20 25 30 Ser Arg He Leu Asp Asn Leu Leu Glu Gly Tyr Asp Asn Arg Leu Arg 35 40 45 Pro Gly Phe Gly Gly Ala Val Thr Glu Val Lys Thr Asp He Tyr Val 50 55 60 Thr Ser Phe Gly Pro Val Ser Asp Val Glu Met Glu Tyr Thr Met Asp 65 70 75 80 Val Phe Phe Arg Gin Thr Trp Thr Asp Glu Arg Leu Lys Phe Gly Gly 85 90 95 Pro Thr Glu He Leu Ser Leu Asn Asn Leu Met Val Ser Lys He Trp 100 105 110 Thr Pro Asp Thr Phe Phe Arg Asn Gly Lys Lys Ser He Ala His Asn 115 120 125 Met Thr Thr Pro Asn Lys Leu Phe Arg He Met Gin Asn Gly Thr He 130 135 140 Leu Tyr Thr Met Arg Leu Thr He Asn Ala Asp Cys Pro Met Arg Leu 145 150 155 160 Val Asn Phe Pro Met Asp Gly His Ala Cys Pro Leu Lys Phe Gly Ser 165 170 175 Tyr Ala Tyr Pro Lys Ser Glu He He Tyr Thr Trp Lys Lys Gly Pro 180 185 190 Leu Tyr Ser Val Glu Val Pro Glu Glu Ser Ser Ser Leu Leu Gin Tyr 195 200 205 Asp Leu He Gly Gin Thr Val Ser Ser Glu Thr He Lys Ser Asn Thr 210 215 220 Gly Glu Tyr Val He Met Thr Val Tyr Phe His Leu Gin Arg Lys Met 225 230 235 240 Gly Tyr Phe Met He Gin He Tyr Thr Pro Cys He Met Thr Val He 245 250 255 Leu Ser Gin Val Ser Phe Trp He Asn Lys Glu Ser Val Pro Ala Arg 260 265 270 Thr Val Leu Gly He Thr Thr Val Leu Thr Met Thr Thr Leu Ser He 275 280 285 Ser Ala Arg His Ser Leu Pro Lys Val Ser Tyr Ala Thr Ala Met Asp 290 295 300 Trp Phe He Ala Val Cys Phe Ala Phe Val Phe Ser Ala Leu He Glu 305 310 315 320 Phe Ala Ala Val Asn Tyr Phe Thr Asn Leu Gin Thr Gin Lys Ala Lys 325 330 335 Arg Lys Ala Gin Phe Ala Ala Pro Pro Thr Val Thr He Ser Lys Ala 340 345 350 Thr Glu Pro Leu Glu Ala Glu He Val Leu His Pro Asp Ser Lys Tyr 355 360 365 His Leu Lys Lys Arg He Thr Ser Leu Ser Leu Pro He Val Ser Ser 370 375 380 Ser Glu Ala Asn Lys Val Leu Thr Arg Ala Pro He Leu Gin Ser Thr 385 390 395 400 Pro Val Thr Pro Pro Pro Leu Pro Pro Ala Phe Gly Gly Thr Ser Lys 405 410 415 He Asp Gin Tyr Ser Arg He Leu Phe Pro Val Ala Phe Ala Gly Phe 420 425 430 Asn Leu Val Tyr Trp Val Val Tyr Leu Ser Lys Asp Thr Met Glu Val 435 440 445 Ser Ser Ser Val Glu 450 (2) INFORMATION FOR SEQ ID NO: 5: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1866 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA ( ix) FEATURE : (A) NAME/KEY: CDS (B) LOCATION: 225..1646 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 5: GAATTCCGCG CGGGGAAGGG AAGAAGAGGA CGAGGTGGCG CAGAGACCGC GGGAGAACAC 60 AGTGCCTCCG GAGGAAATCT GCTCGGTCCC CGGCAGCCGC GCTTCCCCTT TGATGTTTTG 120 GTACGCCGTG GCCATGCGCC TCACATTAGA ATTACTGCAC TGGGCAGACT AAGTTGGATC 180 TCCTCTCTTC AGTGAAACCC TCAATTCCAT CAAAAACTAA AGGG ATG TGG AGA GTG 236 Met Trp Arg Val 1 CGG AAA AGG GGC TAC TTT GGG ATT TGG TCC TTC CCC TTA ATA ATC GCC 284 Arg Lys Arg Gly Tyr Phe Gly He Trp Ser Phe Pro Leu He He Ala 5 10 15 20 GCT GTC TGT GCG CAG AGT GTC AAT GAC CCT AGT AAT ATG TCG CTG GTT 332 Ala Val Cys Ala Gin Ser Val Asn Asp Pro Ser Asn Met Ser Leu Val 25 30 35 AAA GAG ACG GTG GAT AGA CTC CTG AAA GGC TAT GAC ATT CGT CTG AGA 380 Lys Glu Thr Val Asp Arg Leu Leu Lys Gly Tyr Asp He Arg Leu Arg 40 45 50 CCA GAT TTT GGA GGT CCC CCC GTG GCT GTG GGG ATG AAC ATT GAC ATT 428 Pro Asp Phe Gly Gly Pro Pro Val Ala Val Gly Met Asn He Asp He 55 60 65 GCC AGC ATC GAT ATG GTT TCT GAA GTC AAT ATG GAT TAT ACC TTG ACA 476 Ala Ser He Asp Met Val Ser Glu Val Asn Met Asp Tyr Thr Leu Thr 70 75 80 ATG TAC TTT CAA CAA GCC TGG AGA GAT AAG AGG CTG TCC TAT AAT GTA 524 Met Tyr Phe Gin Gin Ala Trp Arg Asp Lys Arg Leu Ser Tyr Asn Val 85 90 95 100 ATA CCT TTA AAC TTG ACT CTG GAC AAC AGA GTG GCA GAC CAG CTC TGG 572 He Pro Leu Asn Leu Thr Leu Asp Asn Arg Val Ala Asp Gin Leu Trp 105 110 115 GTG CCT GAT ACC TAT TTC CTG AAC GAT AAG AAG TCA TTT GTG CAC GGA 620 Val Pro Asp Thr Tyr Phe Leu Asn Asp Lys Lys Ser Phe Val His Gly 120 125 130 GTG ACT GTT AAG AAC CGC ATG ATT CGC CTG CAT CCT GAT GGC ACC GTC 668 Val Thr Val Lys Asn Arg Met He Arg Leu His Pro Asp Gly Thr Val 135 140 145 CTT TAT GGA CTC AGA ATC ACA ACC ACA GCT GCC TGC ATG ATG GAC CTA 716 Leu Tyr Gly Leu Arg He Thr Thr Thr Ala Ala Cys Met Met Asp Leu 150 155 160 AGG AGG TAC CCA CTG GAT GAA CAA AAC TGC ACC TTG GAA ATT GAG AGC 764 Arg Arg Tyr Pro Leu Asp Glu Gin Asn Cys Thr Leu Glu He Glu Ser 165 170 175 180 TAT GGA TAC ACA ACT GAT GAC ATT GAG TTT TAC TGG CGT GGC GAT GAT 812 Tyr Gly Tyr Thr Thr Asp Asp He Glu Phe Tyr Trp Arg Gly Asp Asp 185 190 195 AAT GCA GTA ACA GGA GTA ACG AAA ATT GAA CTT CCA CAG TTC TCT ATT 860 Asn Ala Val Thr Gly Val Thr Lys He Glu Leu Pro Gin Phe Ser He 200 205 210 GTA GAT TAC AAA CTT ATC ACC AAG AAG GTT GTT TTT TCC ACA GGT TCC 908 Val Asp Tyr Lys Leu He Thr Lys Lys Val Val Phe Ser Thr Gly Ser 215 220 225 TAT CCC AGG TTA TCC CTC AGC TTT AAG CTT AAG AGA AAC ATT GGC TAC 956 Tyr Pro Arg Leu Ser Leu Ser Phe Lys Leu Lys Arg Asn He Gly Tyr 230 235 240 TTT ATC CTG CAA ACA TAC ATG CCT TCC ATC CTG ATT ACC ATC CTC TCC 1004 Phe He Leu Gin Thr Tyr Met Pro Ser He Leu He Thr He Leu Ser 245 250 255 260 TGG GTC TCC TTC TGG ATT AAT TAC GAT GCT TCA GCT GCA AGG GTG GCA 1052 Trp Val Ser Phe Trp He Asn Tyr Asp Ala Ser Ala Ala Arg Val Ala 265 270 275 TTA GGA ATC ACA ACT GTC CTC ACA ATG ACC ACA ATC AAC ACC CAC CTC 1100 Leu Gly He Thr Thr Val Leu Thr Met Thr Thr He Asn Thr His Leu 280 285 290 CGG GAA ACT CTC CCT ΛAA ATC CCC TAT GTG AAG GCC ATT GAC ATG TAC 1148 Arg Glu Thr Leu Pro Lys He Pro Tyr Val Lys Ala He Asp Met Tyr 295 300 305 CTG ATG GGG TGC TTT GTC TTC GTT TTC ATG GCC CTT CTG GAA TAT GCC 1196 Leu Met Gly Cys Phe Val Phe Val Phe Met Ala Leu Leu Glu Tyr Ala 310 315 320 CTA GTC AAC TAC ATC TTC TTT GGG AGG .GGG CCC CAA CGC CAA AAG AAA 1244 Leu Val Asn Tyr He Phe Phe Gly Arg Gly Pro Gin Arg Gin Lys Lys 325 330 335 340 GCA GCT GAG AAG GCT GCC AGT GCC AAC AAT GAG AAG ATG CGC CTG GAT 1292 Ala Ala Glu Lys Ala Ala Ser Ala Asn Asn Glu Lys Met Arg Leu Asp 345 350 355 GTC AAC AAG ATG GAC CCC CAT GAG AAC ATC TTA CTG AGC ACT CTC GAG 1340 Val Asn Lys Met Asp Pro His Glu Asn He Leu Leu Ser Thr Leu Glu 360 365 370 ATA AAA AAT GAA ATG GCC ACA TCT GAG GCT GTG ATG GGA CTT GGA GAC 1388 He Lys Asn Glu Met Ala Thr Ser Glu Ala Val Met Gly Leu Gly Asp 375 380 385 CCC AGA AGC ACA ATG CTA GCC TAT GAT GCC TCC AGC ATC CAG TAT CGG 1436 Pro Arg Ser Thr Met Leu Ala Tyr Asp Ala Ser Ser He Gin Tyr Arg 390 395 400 AAA GCT GGG TTG CCC AGG CAT AGT TTT GGC CGA AAT GCT CTG GAA CGA 1484 Lys Ala Gly Leu Pro Arg His Ser Phe Gly Arg Asn Ala Leu Glu Arg 405 410 415 420 CAT GTG GCG CAA AAG AAA AGT CGC CTG AGG AGA CGC GCC TCC CAA CTG 1532 His Val Ala Gin Lys Lys Ser Arg Leu Arg Arg Arg Ala Ser Gin Leu 425 430 435 AAA ATC ACC ATC CCT GAC TTG ACT GAT GTG AAT GCC ATA GAT CGG TGG 1580 Lys He Thr He Pro Asp Leu Thr Asp Val Asn Ala He Asp Arg Trp 440 445 450 TCC CGC ATA TTC TTC CCA GTG GTT TTT TCC TTC TTC AAC ATC GTC TAT 1628 Ser Arg He Phe Phe Pro Val Val Phe Ser Phe Phe Asn He Val Tyr 455 460 465 TGG CTT TAT TAT GTG AAC TAAAACATGG CCTCCCACTG GAAGCAAGGA 1676 Trp Leu Tyr Tyr Val Asn 470 CTAGATTCCT CCTCAAACCA GTTGTACAGC CTGATGTAGG ACTTGGAAAA CACATCAATC 1736 CAGGACAAAA GTGACGCTAA AATACCTTAG TTGCTGGCCT ATCCTGTGGT CCATTTCATA 1796 CCATTTGGGT TGCTTCTGCT AAGTAATGAA TACACTAAGG TCCTTGTGGT TTTCCAGTTA 1856 AAACGCAAGT 1866 (2) INFORMATION FOR SEQ ID NO: 6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 474 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 6: Met Trp Arg Val Arg Lys Arg Gly Tyr Phe Gly He Trp Ser Phe Pro 1 5 10 15 Leu He He Ala Ala Val Cys Ala Gin Ser Val Asn Asp Pro Ser Asn 20 25 30 Met Ser Leu Val Lys Glu Thr Val Asp Arg Leu Leu Lys Gly Tyr Asp 35 40 45 He Arg Leu Arg Pro Asp Phe Gly Gly Pro Pro Val Ala Val Gly Met 50 55 60 Asn He Asp He Ala Ser He Asp Met Val Ser Glu Val Asn Met Asp 65 70 75 80 Tyr Thr Leu Thr Met Tyr Phe Gin Gin Ala Trp Arg Asp Lys Arg Leu 85 90 95 Ser Tyr Asn Val He Pro Leu Asn Leu Thr Leu Asp Asn Arg Val Ala 100 105 110 Asp Gin Leu Trp Val Pro Asp Thr Tyr Phe Leu Asn Asp Lys Lys Ser 115 120 125 Phe Val His Gly Val Thr Val Lys Asn Arg Met He Arg Leu His Pro 130 135 140 Asp Gly Thr Val Leu Tyr Gly Leu Arg He Thr Thr Thr Ala Ala Cys 145 150 155 160 Met Met Asp Leu Arg Arg Tyr Pro Leu Asp Glu Gin Asn Cys Thr Leu 165 170 175 Glu He Glu Ser Tyr Gly Tyr Thr Thr Asp Asp He Glu Phe Tyr Trp 180 185 190 Arg Gly Asp Asp Asn Ala Val Thr Gly Val Thr Lys He Glu Leu Pro 195 200 205 Gin Phe Ser He Val Asp Tyr Lys Leu He Thr Lys Lys Val Val Phe 210 215 220 Ser Thr Gly Ser Tyr Pro Arg Leu Ser Leu Ser Phe Lys Leu Lys Arg 225 230 235 240 Asn He Gly Tyr Phe He Leu Gin Thr Tyr Met Pro Ser He Leu He 245 250 255 Thr He Leu Ser Trp Val Ser Phe Trp He Asn Tyr Asp Ala Ser Ala 260 265 270 Ala Arg Val Ala Leu Gly He Thr Thr Val Leu Thr Met Thr Thr He 275 280 285 Asn Thr His Leu Arg Glu Thr Leu Pro Lys He Pro Tyr Val Lys Ala 290 295 300 He Asp Met Tyr Leu Met Gly Cys Phe Val Phe Val Phe Met Ala Leu 305 310 315 320 Leu Glu Tyr Ala Leu Val Asn Tyr He Phe Phe Gly Arg Gly Pro Gin 325 330 335 Arg Gin Lys Lys Ala Ala Glu Lys Ala Ala Ser Ala Asn Asn Glu Lys 340 345 350 Met Arg Leu Asp Val Asn Lys Met Asp Pro His Glu Asn He Leu Leu 355 360 365 Ser Thr Leu Glu He Lys Asn Glu Met Ala Thr Ser Glu Ala Val Met 370 375 380 Gly Leu Gly Asp Pro Arg Ser Thr Met Leu Ala Tyr Asp Ala Ser Ser 385 390 395 400 He Gin Tyr Arg Lys Ala Gly Leu Pro Arg His Ser Phe Gly Arg Asn 405 410 415 Ala Leu Glu Arg His Val Ala Gin Lys Lys Ser Arg Leu Arg Arg Arg 420 425 430 Ala Ser Gin Leu Lys He Thr He Pro Asp Leu Thr Asp Val Asn Ala 435 440 445 He Asp Arg Trp Ser Arg He Phe Phe Pro Val Val Phe Ser Phe Phe 450 455 460 Asn He Val Tyr Trp Leu Tyr Tyr Val Asn 465 470 (2) INFORMATION FOR SEQ ID NO: 7: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2189 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 214..1566 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 7: CCTAGCGCTC CTCTCCGGCT TCCACCAGCC CATCGCTCCA CGCTCTCTTG GCTGCTGCAG 60 TCTCGGTCTC TCTCTCTCTC TCTCTCTCTC TCTCTCTCTC TCTCTCTCTC TCTCTCTCTC 120 TCTCTCTCTC TCTCTCCCAA GTTTCCTATC TCGTCAAGAT CAGGGCAAAA GAAGAAAACA 180 CCGAATTCTG CTTGCCGTTT CAGAGCGGCG GTG ATG AAG ACA AAA TTG AAC ATC 234 Met Lys Thr Lys Leu Asn He 1 5 TAC AAC ATC GAG TTC CTG CTT TTT GTT TTC TTG GTG TGG GAC CCT GCC 282 Tyr Asn He Glu Phe Leu Leu Phe Val Phe Leu Val Trp Asp Pro Ala 10 15 20 AGG TTG GTG CTG GCT AAC ATC CAA GAA GAT GAG GCT AAA AAT AAC ATT 330 Arg Leu Val Leu Ala Asn He Gin Glu Asp Glu Ala Lys Asn Asn He 25 30 35 ACC ATC TTT ACG AGA ATT CTT GAC AGA CTT CTG GAT GGT TAC GAT AAT 378 Thr He Phe Thr Arg He Leu Asp Arg Leu Leu Asp Gly Tyr Asp Asn 40 45 50 55 CGG CTT AGA CCA GGA CTG GGA GAC AGT ATT ACT GAA GTC TTC ACT AAC 426 Arg Leu Arg Pro Gly Leu Gly Asp Ser He Thr Glu Val Phe Thr Asn 60 65 70 ATC TAC GTG ACC AGT TTT GGC CCT GTC TCA GAT ACA GAT ATG GAA TAT 474 He Tyr Val Thr Ser Phe Gly Pro Val Ser Asp Thr Asp Met Glu Tyr 75 80 85 ACA ATT GAT GTT TTC TTT CGA CAA AAA TGG AAA GAT GAA CGT TTA AAA 522 Thr He Asp Val Phe Phe Arg Gin Lys Trp Lys Asp Glu Arg Leu Lys 90 95 100 TTT AAA GGT CCT ATG AAT ATC CTT CGA CTA AAC AAT TTA ATG GCT AGC 570 Phe Lys Gly Pro Met Asn He Leu Arg Leu Asn Asn Leu Met Ala Ser 105 110 115 AAA ATC TGG ACT CCA GAT ACC TTT TTT CAC AAT GGG AAG AAA TCA GTA 618 Lys He Trp Thr Pro Asp Thr Phe Phe His Asn Gly Lys Lys Ser Val 120 125 130 135 GCT CAT AAT ATG ACA ATG CCA AAT AAG TTG CTT CGA ATT CAG GAT GAT 666 Ala His Asn Met Thr Met Pro Asn Lys Leu Leu Arg He Gin Asp Asp 140 145 150 GGG ACT CTG CTG TAT ACC ATG AGG CTT ACA GTT CAA GCT GAA TGC CCA 714 Gly Thr Leu Leu Tyr Thr Met Arg Leu Thr Val Gin Ala Glu Cys Pro 155 160 165 ATG CAC TTG GAG GAT TTC CCA ATG GAT GCT CAT TCA TGT CCT CTG AAA 762 Met His Leu Glu Asp Phe Pro Met Asp Ala His Ser Cys Pro Leu Lys 170 175 180 TTT GGC AGC TAT GCA TAT ACA ACT TCA GAG GTC ACT TAT ATT TGG ACT 810 Phe Gly Ser Tyr Ala Tyr Thr Thr Ser Glu Val Thr Tyr He Trp Thr 185 190 195 TAC AAT GCA TCT GAT TCA GTA CAG GTT GCT CCT GAT GGC TCT AGG TTA 858 Tyr Asn Ala Ser Asp Ser Val Gin Val Ala Pro Asp Gly Ser Arg Leu 200 205 210 215 AAT CAA TAT GAC CTG CTG GGC CAA TCA ATC GGA AAG GAG ACA ATT AAA 906 Asn Gin Tyr Asp Leu Leu Gly Gin Ser He Gly Lys Glu Thr He Lys 220 225 230 TCC AGT ACA GGT GAA TAT ACT GTA ATG ACA GCT CAT TTC CAC CTG AAA 954 Ser Ser Thr Gly Glu Tyr Thr Val Met Thr Ala His Phe His Leu Lys 235 240 245 AGA AAA ATT GGG TAT TTT GTG ATT CAA ACC TAT CTG CCT TGC ATC ATG 1002 Arg Lys He Gly Tyr Phe Val He Gin Thr Tyr Leu Pro Cys He Met 250 255 260 ACT GTC ATT CTC TCC CAA GTT TCA TTC TGG CTT AAC AGA GAA TCT GTG 1050 Thr Val He Leu Ser Gin Val Ser Phe Trp Leu Asn Arg Glu Ser Val 265 270 275 CCT GCA AGA ACT GTG TTT GGA GTA ACA ACT GTC CTA ACA ATG ACA ACT 1098 Pro Ala Arg Thr Val Phe Gly Val Thr Thr Val Leu Thr Met Thr Thr 280 285 290 295 CTA AGC ATC AGT GCT CGG AAT TCT CTC CCC AAA GTG GCT TAT GCA ACT 1146 Leu Ser He Ser Ala Arg Asn Ser Leu Pro Lys Val Ala Tyr Ala Thr 300 305 310 GCC ATG GAC TGG TTT ATT GCT GTT TGT TAT GCA TTT GTG TTC TCT GCC 1194 Ala Met Asp Trp Phe He Ala Vat Cys Tyr Ala Phe Val Phe Ser Ala 315 320 325 CTA ATT GAA TTT GCA ACT GTT AAT TAC TTC ACC AAA AGA GGA TGG ACT 1242 Leu He Glu Phe Ala Thr Val Asn Tyr Phe Thr Lys Arg Gly Trp Thr 330 335 340 TGG GAT GGG AAG AGT GTA GTA AAT GAC AAG AAA AAA GAA AAG GCT TCC 1290 Trp Asp Gly Lys Ser Val Val Asn Asp Lys Lys Lys Glu Lys Ala Ser 345 350 355 GTT ATG ATA CAG AAC AAC GCT TAT GCA GTG GCT GTT GCC AAT TAT GCC 1338 Val Met He Gin Asn Asn Ala Tyr Ala Val Ala Val Ala Asn Tyr Ala 360 365 370 375 CCG AAT CTT TCA AAA GAT CCA GTT CTC TCC ACC ATC TCC AAG AGT GCA 1386 Pro Asn Leu Ser Lys Asp Pro Val Leu Ser Thr He Ser Lys Ser Ala 380 385 390 ACC ACG CCA GAA CCC AAC AAG AAG CCA GAA AAC AAG CCA GCT GAA GCA 1434 Thr Thr Pro Glu Pro Asn Lys Lys Pro Glu Asn Lys Pro Ala Glu Ala 395 400 405 AAG AAA ACT TTC AAC AGT GTT AGC AAA ATT GAC AGA ATG TCC AGA ATA 1482 Lys Lys Thr Phe Asn Ser Val Ser Lys He Asp Arg Met Ser Arg He 410 415 420 GTT TTT CCA GTT TTG TTT GGT ACC TTT AAT TTA GTT TAC TGG GCT ΛCA 1530 Val Phe Pro Val Leu Phe Gly Thr Phe Asn Leu Val Tyr Trp Ala Thr 425 430 435 TAT TTA AAC AGA GAA CCT GTA TTA GGG GTC AGT CCT TGAATTGAGA 1576 Tyr Leu Asn Arg Glu Pro Val Leu Gly Val Ser Pro 440 445 450 CCCATGTTAT CTTTGGGATG TATAGCAACA TTAAATTTGG TTTGTTTTGC TATGTACAGT 1636 CTGACTAATA ACTGCTAATT TGTGATCCAA CATGTACAGT ATGTATATAG TGACATAGCT 1696 TACCAGTAGA CCTTTAATGG AGACATGCAT TTGCTAACTC ATGGAACTGC AGACAGAAAG 1756 CACTCCATGC GAAAACAGCC ATTGCCTTTT TTAAAGATTT ACCCTAGGAC CTGATTTAAA 1816 GTGAATTTCA AGTGACCTGA TTAATTTCCT ATTCTTCCAA ATGAGATGAA AATGGGGATC 1876 CTGTACAACC CTTTGTGGAC CCTTTTGGTT TAGCTCTTAA GTAGGGGTAT TTTCTACTGT 1936 TGCTTAATTA TGATGGAAGA TAACATTGTC ATTCCTAGAT GAATCCTTTG AAGTAACAAA 1996 CATTGTATCT GACATCAGCT CTGTTCATGA GTGCTCAGAG TCCCTGCTAA TGTAATTGGA 2056 AGCTTGGTAC ACATAAGAAA AACTAGAGAT TTGAAATCTA GCTATGAATT ACTCTATATA 2116 GTATCTATAG CCATGTACAT ATTACAGCAT GACAAGCTCG AAATAATTAT GAGTCAGCCC 2176 GAAAGATGTT AAT 2189 (2) INFORMATION FOR SEQ ID NO: 8: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 451 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein ( xi ) SEQUENCE DESCRIPTION : SEQ ID NO : 8 Met Lys Thr Lys Leu Asn He Tyr Asn He Glu Phe Leu Leu Phe Va l 1 5 10 15 Phe Leu Val Trp Asp Pro Ala Arg Leu Val Leu Ala Asn He Gin Glu 20 25 30 Asp Glu Ala Lys Asn Asn He Thr He Phe Thr Arg He Leu Asp Arg 35 40 45 Leu Leu Asp Gly Tyr Asp Asn Arg Leu Arg Pro Gly Leu Gly Asp Ser 50 55 60 He Thr Glu Val Phe Thr Asn He Tyr Val Thr Ser Phe Gly Pro Val 65 70 75 80 Ser Asp Thr Asp Met Glu Tyr Thr He Asp Val Phe Phe Arg Gin Lys 85 90 95 Trp Lys Asp Glu Arg Leu Lys Phe Lys Gly Pro Met Asn He Leu Arg 100 105 110 Leu Asn Asn Leu Met Ala Ser Lys He Trp Thr Pro Asp Thr Phe Phe 115 120 125 His Asn Gly Lys Lys Ser Val Ala His Asn Met Thr Met Pro Asn Lys 130 135 140 Leu Leu Arg He Gin Asp Asp Gly Thr Leu Leu Tyr Thr Met Arg Leu 145 150 155 160 Thr Val Gin Ala Glu Cys Pro Met His Leu Glu Asp Phe Pro Met Asp 165 170 175 Ala His Ser Cys Pro Leu Lys Phe Gly Ser Tyr Ala Tyr Thr Thr Ser 180 185 190 Glu Val Thr Tyr He Trp Thr Tyr Asn Ala Ser Asp Ser Val Gin Val 195 200 205 Ala Pro Asp Gly Ser Arg Leu Asn Gin Tyr Asp Leu Leu Gly Gin Ser 210 215 220 He Gly Lys Glu Thr He Lys Ser Ser Thr Gly Glu Tyr Thr Val Met 225 230 235 240 Thr Ala His Phe His Leu Lys Arg Lys He Gly Tyr Phe Val He Gin 245 250 255 Thr Tyr Leu Pro Cys He Met Thr Val He Leu Ser Gin Val Ser Phe 260 265 270 Trp Leu Asn Arg Glu Ser Val Pro Ala Arg Thr Val Phe Gly Val Thr 275 280 285 Thr Val Leu Thr Met Thr Thr Leu Ser He Ser Ala Arg Asn Ser Leu 290 295 300 Pro Lys Val Ala Tyr Ala Thr Ala Met Asp Trp Phe He Ala Val Cys 305 310 315 320 Tyr Ala Phe Val Phe Ser Ala Leu He Glu Phe Ala Thr Val Asn Tyr 325 330 335 Phe Thr Lys Arg Gly Trp Thr Trp Asp Gly Lys Ser Val Val Asn Asp 340 345 350 Lys Lys Lys Glu Lys Ala Ser Vat Met He Gin Asn Asn Ala Tyr Ala 355 360 365 Val Ala Val Ala Asn Tyr Ala Pro Asn Leu Ser Lys Asp Pro Val Leu 370 375 380 Ser Thr He Ser Lys Ser Ala Thr Thr Pro Glu Pro Asn Lys Lys Pro 385 390 395 400 Glu Asn Lys Pro Ala Glu Ala Lys Lys Thr Phe Asn Ser Val Ser Lys 405 410 415 He Asp Arg Met Ser Arg He Val Phe Pro Val Leu Phe Gly Thr Phe 420 425 430 Asn Leu Val Tyr Trp Ala Thr Tyr Leu Asn Arg Glu Pro Val Leu Gly 435 440 445 Val Ser Pro 450 (2) INFORMATION FOR SEQ ID NO: 9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1638 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 87..1562 (Xi) SEQUENCE DESCRIPTION: SEQ ID NO: 9: GAATTCCCTT GTTTCAGTTC ATTCATCCTT CTCTCCTTTC CGCTCAGACT GTAGAGCTCG 60 GTCTCTCCAA GTTTGTGCCT AAGAAG ATG ATA ATC ACA CAA ACA AGT CAC TGT 113 Met He He Thr Gin Thr Ser His Cys 1 5 TAC ATG ACC AGC CTT GGG ATT CTT TTC CTG ATT AAT ATT CTC CCT GGA 161 Tyr Met Thr Ser Leu Gly He Leu Phe Leu He Asn He Leu Pro Gly 10 15 20 25 ACC ACT GGT CAA GGG GAA TCA AGA CGA CAA GAA CCC GGG GAC TTT GTG 209 Thr Thr Gly Gin Gly Glu Ser Arg Arg Gin Glu Pro Gly Asp Phe Val 30 35 40 AAG CAG GAC ATT GGC GGG CTG TCT CCT AAG CAT GCC CCA GAT ATT CCT 257 Lys Gin Asp He Gly Gly Leu Ser Pro Lys His Ala Pro Asp He Pro 45 50 55 GAT GAC AGC ACT GAC AAC ATC ACT ATC TTC ACC AGA ATC TTG GAT CGT 305 Asp Asp Ser Thr Asp Asn He Thr He Phe Thr Arg He Leu Asp Arg 60 65 70 CTT CTG GAC GGC TAT GAC AAC CGG CTG CGA CCT GGG CTT GGA GAT GCA 353 Leu Leu Asp Gly Tyr Asp Asn Arg Leu Arg Pro Gly Leu Gly Asp Ala 75 80 85 GTG ACT GAA GTG AAG ACT GAC ATC TAC GTG ACC AGT TTT GGC CCT GTG 401 Val Thr Glu Val Lys Thr Asp He Tyr Val Thr Ser Phe Gly Pro Val 90 95 100 105 TCA GAC ACT GAC ATG GAG TAC ACT ATT GAT GTA TTT TTT CGG CAG ACA 449 Ser Asp Thr Asp Met Glu Tyr Thr He Asp Vat Phe Phe Arg Gin Thr 110 115 120 TGG CAT GAT GAA AGA CTG AAA TTT GAT GGC CCC ATG AAG ATC CTT CCA 497 Trp His Asp Glu Arg Leu Lys Phe Asp Gly Pro Met Lys He Leu Pro 125 130 135 CTG AAC AAT CTC CTG GCT AGT AAG ATC TGG ACA CCG GAC ACC TTC TTC 545 Leu Asn Asn Leu Leu Ala Ser Lys He Trp Thr Pro Asp Thr Phe Phe 140 145 150 CAC AAT GGC AAG AAA TCA GTG GCT CAT AAC ATG ACC ACG CCC AAC AAG 593 His Asn Gly Lys Lys Ser Val Ala His Asn Met Thr Thr Pro Asn Lys 155 160 165 CTG CTC AGA TTG GTG GAC AAC GGA ACC CTC CTC TAT ACA ATG AGG TTA 641 Leu Leu Arg Leu Val Asp Asn Gly Thr Leu Leu Tyr Thr Met Arg Leu 170 175 180 185 ACA ATT CAT GCT GAG TGT CCC ATG CAT TTG GAA GAT TTT CCC ATG GAT 689 Thr He His Ala Glu Cys Pro Met His Leu Glu Asp Phe Pro Met Asp 190 195 200 GTG CAT GCC TGC CCA CTG AAG TTT GGA AGC TAT GCC TAT ACA ACA GCT 737 Vat His Ala Cys Pro Leu Lys Phe Gly Ser Tyr Ala Tyr Thr Thr Ala 205 210 215 GAA GTG GTT TAT TCT TGG ACT CTC GGA AAG AAC AAA TCC GTG GAA GTG 785 Glu Vat Vat Tyr Ser Trp Thr Leu Gly Lys Asn Lys Ser Val Glu Val 220 225 230 GCA CAG GAT CGT TCT CGC TTG AAC CAG TAT GAC CTT TTG GGC CAT CTT 833 Ala Gin Asp Gly Ser Arg Leu Asn Gin Tyr Asp Leu Leu Gly His Val 235 240 245 GTT GGG ACA GAG ATA ATC CGG TCT AGT ACA GGA GAA TAT GTC GTC ATG 881 Val Gly Thr Glu He He Arg Ser Ser Thr Gty Glu Tyr Val Val Met 250 255 260 265 ACA ACC CAC TTC CAT CTC AAG CGA AAA ATT GGC TAC TTT GTG ATC CAG 929 Thr Thr His Phe His Leu Lys Arg Lys He Gly Tyr Phe Val He Gin 270 275 280 ACC TAC TTG CCA TGT ATC ATG ACT GTC ATT CTG TCA CAA GTG TCG TTC 977 Thr Tyr Leu Pro Cys He Met Thr Val He Leu Ser Gin Val Ser Phe 285 290 295 TGG CTC AAC AGA GAG TCT GTT CCT GCC CGT ACA GTC TTT GGT GTC ACC 1025 Trp Leu Asn Arg Glu Ser Vat Pro Ala Arg Thr Val Phe Gly Val Thr 300 305 310 ACT GTG CTT ACC ATG ACC ACC TTG AGT ATC AGT GCC AGA AAT TCC TTA 1073 Thr Val Leu Thr Met Thr Thr Leu Ser He Ser Ala Arg Asn Ser Leu 315 320 325 CCT AAA GTG GCA TAT GCG ACG GCC ATG GAC TGG TTC ATA GCC GTC TGT 1121 Pro Lys Val Ala Tyr Ala Thr Ala Met Asp Trp Phe He Ala Val Cys 330 335 340 345 TAT GCC TTT GTA TTT TCT GCA CTG ATT GAA TTT GCC ACT GTC AAC TAT 1169 Tyr Ala Phe Val Phe Ser Ala Leu He Glu Phe Ala Thr Val Asn Tyr 350 355 360 TTC ACC AAG CGG AGT TGG GCT TGG GAA GGC AAG AAG GTG CCA GAG GCC 1217 Phe Thr Lys Arg Ser Trp Ala Trp Glu Gly Lys Lys Val Pro Glu Ala 365 370 375 CTG GAG ATG AAG AAG AAA ACA CCA GCA GCC CCA GCA AAG AAA ACC AGC 1265 Leu Glu Met Lys Lys Lys Thr Pro Ala Ala Pro Ala Lys Lys Thr Ser 380 385 390 ACT ACC TTC AAC ATC GTG GGG ACC ACC TAT CCC ATC AAC CTG GCC AAG 1313 Thr Thr Phe Asn He Val Gly Thr Thr Tyr Pro He Asn Leu Ala Lys 395 400 405 GAC ACT GAA TTT TCC ACC ATC TCC AAG GGC GCT GCT CCC AGT GCC TCC 1361 Asp Thr Glu Phe Ser Thr He Ser Lys Gly Ala Ala Pro Ser Ala Ser 410 415 420 425 TCA ACC CCA ACA ATC ATT GCT TCA CCC AAG GCC ACC TAC GTG CAG GAC 1409 Ser Thr Pro Thr He He Ala Ser Pro Lys Ala Thr Tyr Val Gin Asp 430 435 440 AGC CCG ACT GAG ACC AAG ACC TAC AAC AGT GTC AGC AAG GTT GAC AAA 1457 Ser Pro Thr Glu Thr Lys Thr Tyr Asn Ser Val Ser Lys Vat Asp Lys 445 450 455 ATT TCC CGC ATC ATC TTT CCT GTG CTC TTT GCC ATA TTC AAT CTG GTC 1505 He Ser Arg He He Phe Pro Val Leu Phe Ala He Phe Asn Leu Val 460 465 470 TAT TGG GCC ACA TAT GTC AAC CGG GAG TCA GCT ATC AAG GGC ATG ATC 1553 Tyr Trp Ala Thr Tyr Val Asn Arg Glu Ser Ala He Lys Gly Met He 475 480 485 CGC AAA CAG TAGATAGTGG CAGTGCAGCA ACCAGAGCAC TGTATACCCC 1602 Arg Lys Gin 490 GTGAAGCATC CAGGCACCCA AACCCCGGGG CTCCCC 1638 (2) INFORMATION FOR SEQ ID NO: 10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 492 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 10: Met He He Thr Gin Thr Ser His Cys Tyr Met Thr Ser Leu Gly He 1 5 10 15 Leu Phe Leu He Asn He Leu Pro Gly Thr Thr Gly Gin Gly Glu Ser 20 25 30 Arg Arg Gin Glu Pro Gly Asp Phe Val Lys Gin Asp He Gly Gly Leu 35 40 45 Ser Pro Lys His Ala Pro Asp He Pro Asp Asp Ser Thr Asp Asn He 50 55 60 Thr He Phe Thr Arg He Leu Asp Arg Leu Leu Asp Gty Tyr Asp Asn 65 70 75 80 Arg Leu Arg Pro Gly Leu Gly Asp Ala Val Thr Glu Val Lys Thr Asp 85 90 95 He Tyr Val Thr Ser Phe Gly Pro Val Ser Asp Thr Asp Met Glu Tyr 100 105 110 Thr He Asp Vat Phe Phe Arg Gin Thr Trp His Asp Glu Arg Leu Lys 115 120 125 Phe Asp Gly Pro Met Lys He Leu Pro Leu Asn Asn Leu Leu Ala Ser 130 135 140 Lys He Trp Thr Pro Asp Thr Phe Phe His Asn Gly Lys Lys Ser Val 145 150 155 160 Ala His Asn Met Thr Thr Pro Asn Lys Leu Leu Arg Leu Vat Asp Asn 165 170 175 Gly Thr Leu Leu Tyr Thr Met Arg Leu Thr He His Ala Glu Cys Pro 180 185 190 Met His Leu Glu Asp Phe Pro Met Asp Val His Ala Cys Pro Leu Lys 195 200 205 Phe Gly Ser Tyr Ala Tyr Thr Thr Ala Glu Val Val Tyr Ser Trp Thr 210 215 220 Leu Gly Lys Asn Lys Ser Val Glu Val Ala Gin Asp Gly Ser Arg Leu 225 230 235 240 Asn Gin Tyr Asp Leu Leu Gly His Vat Val Gly Thr Glu He He Arg 245 250 255 Ser Ser Thr Gly Glu Tyr Val Vat Met Thr Thr His Phe His Leu Lys 260 265 270 Arg Lys He Gty Tyr Phe Val He Gin Thr Tyr Leu Pro Cys He Met 275 280 285 Thr Val He Leu Ser Gin Val Ser Phe Trp Leu Asn Arg Glu Ser Val 290 295 300 Pro Ala Arg Thr Val Phe Gly Val Thr Thr Val Leu Thr Met Thr Thr 305 310 315 320 Leu Ser He Ser Ala Arg Asn Ser Leu Pro Lys Val Ala Tyr Ala Thr 325 330 335 Ala Met Asp Trp Phe He Ala Val Cys Tyr Ala Phe Val Phe Ser Ala 340 345 350 Leu He Glu Phe Ala Thr Val Asn Tyr Phe Thr Lys Arg Ser Trp Ala 355 360 365 Trp Glu Gly Lys Lys Val Pro Glu Ala Leu Glu Met Lys Lys Lys Thr 370 375 380 Pro Ala Ala Pro Ala Lys Lys Thr Ser Thr Thr Phe Asn He Val Gly 385 390 395 400 Thr Thr Tyr Pro He Asn Leu Ala Lys Asp Thr Glu Phe Ser Thr He 405 410 415 Ser Lys Gly Ala Ala Pro Ser Ala Ser Ser Thr Pro Thr He He Ala 420 425 430 Ser Pro Lys Ala Thr Tyr Val Gin Asp Ser Pro Thr Glu Thr Lys Thr 435 440 445 Tyr Asn Ser Val Ser Lys Vat Asp Lys He Ser Arg He He Phe Pro 450 455 460 Val Leu Phe Ala He Phe Asn Leu Val Tyr Trp Ala Thr Tyr Val Asn 465 470 475 480 Arg Glu Ser Ala He Lys Gly Met He Arg Lys Gin 485 490

Claims: Claims : 1. A stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the α* * *^^ subunit combination. 2. A stably co-transfected eukaryotic cell line capable of expressing a human GABA A receptor comprising the c ~ 2β3^2 subunit combination. 3. A stably co-transfected eukaryotic cell line capable of expressing a human GABA A receptor comprising the a 5 β 3 2 subunit combination. 4. A stably co-transfected eukaryotic cell line capable of expressing a human GABA A receptor comprising the subunit combination. 5. A stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the subunit combination. 6. A stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the 03 / 03 2 subunit combination. 7. A stably co-transfected eukaryotic cell line capable of expressing a human GABA^ receptor comprising the subunit combination. 8. A membrane preparation containing subunit combinations of the human GABA A receptor derived from a culture of the stably co-transfected eukaryotic cells as claimed in any one of claims 1 to 3. 9. A membrane preparation containing subunit combinations of the human GABA A receptor derived from a culture of the stably co-transfected eukaryotic cells as claimed in any one of claims 4 to 7. 10. A preparation as claimed in claim 8 containing a human GABA A receptor consisting of the <~ ~ _β3Y2S ' α 2* β 3«*K2S or Q *5-*** ! 3< 2S subunit combination isolated from stably co-transfected mouse Ltk~ fibroblast cells. 11. A preparation as claimed in claim 9 containing a human GABA A receptor consisting of the subunit combination isolated from stably co-transfected mouse Ltk ~ fibroblast cells. 12. The use of the cell line as claimed in any one of claims 1 to 3 , and membrane preparations derived therefrom, in screening for and designing medicaments which act upon the human GABA A receptor. 13. The use of the cell line as claimed in any one of claims 4 to 7 , and membrane preparations derived therefrom, in screening for and designing medicaments which act upon the human GABA A receptor.

Inventors: HADINGHAM KAREN LOUISE, WHITING PAUL JOHN, HADINGHAM, KAREN, LOUISE, WHITING, PAUL, JOHN
Applicants: HADINGHAM KAREN LOUISE, MERCK SHARP & DOHME, WHITING PAUL JOHN, HADINGHAM, KAREN, LOUISE, MERCK SHARP & DOHME LIMITED, WHITING, PAUL, JOHN
Application year: 1993
Main classification: C12N15
IPC codes: A61K38, C07K14, C12N5, C12N15, C12P21, C12R1, G01N33