HYBRID HUMAN/PORCINE FACTOR VIII

Abstract: A hybrid human/porcine coagulation factor VIII is produced by isolation and recombination of human and porcine factor VIII subunits, or by genetic engineering of the human and porcine factor VIII genes. Subunits of factor VIII that have been purified from human or porcine plasma are isolated, and hybrid human/porcine factor VIII is produced by mixing either porcine heavy chain subunits with human light chain subunits or by mixing human heavy chain subunits with porcine light chain subunits, thereby producing human light chain/porcine heavy chain and human heavy chain/porcine light chain hybrid molecules. These hybrid molecules are isolated by ion exchange chromatography. Alternatively, recombinant DNA methods are used to swap elements of porcine factor VIII for the corresponding elements of human factor VIII to produce hybrid human/porcine factor VIII.

Description: HYBRID HUMAN/PORCINE FACTOR VIII The government has rights in this invention arising from National Institutes of Health Grant No. HL 40921 that partially funded the research leading to this invention. Background of the Invention This invention relates generally to a hybrid human/porcine factor VIII and methods of preparation and use thereof. Blood clotting begins when platelets adhere to the cut wall of an injured blood vessel at a lesion site. Subsequently, in a cascade of enzymatically regulated reactions, soluble fibrinogen molecules are converted by the enzyme thrombin to insoluble strands of fibrin that hold the platelets together in a thrombus. At each step in the cascade,.a protein precursor is converted to a protease that cleaves the next protein precursor in the series. Cofactors are required at most of the steps. In its active form, the protein factor VIII is a cofactor that is required for the activation of factor X by the protease, activated factor IX. Factor VIII or antihemophilic factor was noticed in plasma and named in the 1930s. In the 1940s, a deficiency in factor VIII was associated with the clotting disorder hemophilia A. Factor VIII was found to be X-linked and was hypothesized to be a protein. Work involving bovine, human, and porcine plasma identified factor VIII as a protein in the 1980s, though its definitive cellular source remains uncertain. Precisely how factor VIII functions in blood coagulation is unknown. It is known that factor VIII is activated to factor Villa proteolytically by thrombin or factor Xa. In combination with calcium and phospholipid, factor Villa makes factor IXa a more efficient activator of factor X by an unknown mechanism. People deficient in factor VIII or having antibodies against factor VIII who are not treated with factor VIII suffer uncontrolled internal bleeding that may cause a range of serious symptoms, from inflammatory reactions in joints to early death. Severe hemophiliacs, who number about 10,000 in the United States, can be treated with infusion of factor VIII, which will restore the blood's normal clotting ability if administered with sufficient frequency and concentration. The classic definition of factor VIII, in fact, is that substance present in normal blood plasma that corrects the clotting defect in plasma derived from individuals with hemophilia A. Several preparations of human plasma-derived factor VIII of varying degrees of purity are available commercially for the treatment of hemophilia A. These include a partially-purified factor VIII derived from the pooled blood of many donors that is heat- and deterge t-treated for viruses but contains a significant level of antigenic proteins; a monoclonal antibody-purified factor VIII that has lower levels of antigenic impurities and viral contamination; and recombinant human factor VIII, clinical trials for which are underway. Additionally, a preparation of partially-purified porcine factor VIII is available to treat patients with inhibitors to human factor VIII, i.e., those who have circulating antibody molecules that bind and neutralize human factor VIII. Hemophiliacs require daily replacement of factor VIII to prevent the deforming hemophilic arthropathy that occurs after many years of recurrent hemorrhages into the joints. However, supplies of factor VIII concentrates have never been plentiful enough for treating hemophiliacs adequately because of problems in commercial production and therapeutic use. For example, the commonly used plasma-derived is difficult to isolate and purify, is immunogenic, and requires treatment to remove the risk of infectivity from AIDS and hepatitis viruses. Recombinant human factor VIII may lessen the latter two problems. Porcine factor VIII may also present an alternative, since human factor VIII is unstable at physiologic concentrations and pH, is present in blood at an extremely low concentration (0.2 μg/ml plasma), and its specific clotting activity is low, compared with porcine factor VIII. Since many inhibitors of human factor VIII react less strongly with porcine factor VIII, porcine factor VIII is currently used to correct factor VIII deficiency in patients under conditions in which they do not respond to infusions of human factor VIII. A limitation of porcine factor VIII is the development of inhibitory antibodies to it after one or more infusions. The problems associated with the commonly used, commercially available, plasma-derived factor VIII have stimulated significant interest in the development of a better factor VIII product. There is a need for a more potent factor VIII molecule so that more units of clotting activity can be delivered per molecule; a factor VIII molecule that is stable at a selected pH and physiologic concentration; a factor VIII molecule that is less apt to produce inhibitory antibodies; and a factor VIII molecule that evades immune detection in patients who have already acquired antibodies to human factor VIII. It is therefore an object of the present invention to provide a factor VIII that corrects hemophilia in a patient deficient in factor VIII or having inhibitors of human factor VIII. It is a further object of the present invention to provide methods for treatment of hemophiliacs. It is another object of the present invention to provide a factor VIII with an increased efficacy in factor VIII clotting assays. It is still another object of the present invention to provide a factor VIII that is stable at a selected pH and physiologic concentration. Summary of the Invention A hybrid human/porcine coagulation factor VIII is produced by isolation and recombination of human and porcine factor VIII subunits or by genetic engineering of the human and porcine factor VIII genes. In the preferred embodiment, subunits of factor VIII are isolated and purified from human or porcine plasma, and hybrid human/porcine factor VIII is produced either by mixture of porcine heavy chain subunits with human light chain subunits or by mixture of human heavy chain subunits with porcine light chain subunits, thereby producing human light chain/porcine heavy chain and human heavy chain/porcine light chain hybrid molecules. These hybrid molecules are isolated by ion exchange chromatography. Alternatively, recombinant DNA methods are used to swap elements of porcine factor VIII for the corresponding elements of human factor VIII, also resulting in hybrid human/porcine factor VIII molecules. Methods for preparing highly purified hybrid human/porcine factor VIII are described having the steps of: (a) isolation of subunits of plasma-derived human factor VIII and subunits of plasma-derived porcine factor VIII, followed by reconstitution of coagulant activity by mixture of human and porcine subunits, followed by isolation of hybrid human/porcine factor VIII by ion exchange chromatography; (b) construction of domains of porcine factor VIII by recombinant DNA technology, followed by swapping of domains of porcine and human factor VIII; or (c) creation of hybrid human/porcine factor VIII by replacement of specific amino acid residues of human factor VIII with the homologous porcine factor VIII amino acid residues by site-directed mutagenesiε. The resulting hybrid human/porcine factor VIII has specific activity greater than human factor VIII and equal to or slightly higher than porcine factor VIII. Brief Description of the Drawings Figure 1 (Prior Art) is a diagrammatic representation of factor VIII molecule showing the subunits (heavy and light chains) and the domains. Detailed Description of the invention - Definitions As used herein, "hybrid human/porcine factor VIII" denotes a functional factor VIII protein molecule with sequence derived from human and porcine factor VIII. This hybrid human/porcine factor VIII has a specific activity equal to or greater than that of porcine factor VIII and has activity in a human factor VIII assay. In some embodiments, this hybrid human/porcine factor VIII is not cross-reactive with all human factor VIII antibodies. "Specific activity," as used herein, refers to the activity that will correct the coagulation defect of human factor VIII deficient plasma. Specific activity is measured in units of clotting activity per milligram total factor VIII protein in a standard assay in which the clotting time of human factor VIII deficient plasma is compared to that of normal human plasma. One unit of factor VIII activity is the activity present in one milliliter of normal human plasma. In the assay, the shorter the time for clot formation, the greater the activity of the factor VIII being assayed. A "hybrid factor VIII" or "hybrid protein," as used herein, is a factor VIII protein in which the amino acid sequence is derived in part from human and in part from porcine origin. This hybrid factor VIII can be made (1) by substitution of isolated, plasma- derived porcine or human subunits (heavy or light chains) for corresponding human or porcine subunits; (2) by substitution of human or porcine domains (Al, A2, A3 r B, Cl, and C2) for corresponding porcine or human domains; (3) by substitution of parts of human or porcine domains for parts of porcine or human domains; or (4) by changing one or more amino acid residue(s) in human factor VIII to the residue(s) in the corresponding porcine sequence. A fusion protein is the product of a hybrid gene in which the coding sequence for one protein is extensivelyaltered, for example, by fusing part of it to the coding sequence for a second protein from a different gene to produce a hybrid gene that encodes the fusion protein. As used herein, a fusion protein is a subset of the hybrid protein described in this application. "Factor VIII deficiency," as used herein, includes deficiency in clotting activity caused by production of a defective factor VIII, by inadequate or no production of factor VIII, or by partial or total inhibition of factor VIII by inhibitors. Hemophilia A is a type of factor VIII deficiency resulting from a defect in an X-linked gene and the absence or deficiency of the factor VIII protein it encodes. "Subunits" of human or porcine factor VIII, as used herein, are the heavy and light chains of the protein. The heavy chain of factor VIII contains three "domains," Al, A2, and B. The light chain of factor VIII also contains three "domains," A3, Cl, and C2. - General Description of Methods Hybrid human/porcine factor VIII molecules that have greater activity in a standard clotting assay when compared to highly-purified human factor VIII can be constructed as follows. Four types of hybrid human/porcine factor VIII and the methods for preparing them are disclosed herein: those obtained (1) (a) by substituting a porcine subunit (i.e., heavy chain or light chain) for the corresponding human subunit; (b) by substituting a porcine domain (i.e., Al, A2, A3, B, Cl, and C2) for the corresponding human domain; and (c) by substituting part of a porcine domain for the corresponding fragment of the human domain; and (2) by changing one or more amino acid residue(s) in human factor VIII to the residue(s) in the corresponding porcine sequence. The hybrid molecule may contain a greater percentage of human than porcine sequence or vice versa, depending on the origin of the various regions, as described in more detail below. It is shown below that hybrid human/porcine factor VIII consisting of porcine heavy chain/human light chain and corresponding to the first type of hybrid listed above has greater specific coagulant activity in a standard clotting assay as compared to human factor VIII. The hybrid human/porcine factor VIII can be useful in treating patients with inhibitors, since these inhibitors can react less well with hybrid human/porcine factor VIII than with either human or porcine factor VIII. Hybrid human/porcine factor VIII proteins listed above under group (1) are made by isolation of subunits of plasma-derived factor VIII, followed by reconstitution and purification. Hybrid human/porcine factor VIII proteins described under group (2) above are made by recombinant DNA methods. Preparation of hybrid human/porcine factor VIII molecules from isolated human and porcine factor VIII subunits by reconstitution: Hybrid human/porcine factor VIII molecules are prepared and isolated, and their procoagulant activity is characterized. One method, modified from procedures reported by Fay, P.J., et al. - 265 J. Biol. Chem. 6197 (1990) , the teachings of which are incorporated herein; and Lollar, J.S., et al. f 263 J. Biol. Chem. 10451 (1988) , the teachings of which are incorporated herein, involves the isolation of subunits (heavy and light chains) of human and porcine factor VIII, followed by recombination of human heavy chain and porcine light chain or by recombination of human light chain and porcine heavy chain. Isolation of individual subunits from both species involves dissociation of the light chain/heavy chain dimer by chelation of calcium with ethylenediaminetetraacetic acid (EDTA) , followed by Mono S™ HPLC (Pharmacia-LKB, Piscataway, NJ) . Hybrid human/porcine factor VIII molecules are reconstituted from isolated subunits in the presence of calcium. Hybrid human light chain/porcine heavy chain or porcine light chain/human heavy chain factor VIII is isolated from unreacted heavy chains by Mono S™ HPLC by procedures for the isolation of porcine factor VIII, as described by Lollar, J.S., et al . , 71 Blood 137-143 (1988) , the teachings of which are incorporated herein. These methods, described in detail in the examples below, result in hybrid human light chain/porcine heavy chain molecules with greater than six times the procoagulant activity of human factor VIII. Preparation of human/porcine factor VIII molecules by recombinant engineering of the sequences encoding human and porcine factor VIII subunits: The human factor VIII gene was isolated and expressed in mammalian cells, as reported by Toole, J.J., et al.. 312 Nature 342-347 (1984) (Genetics Institute) ; Gitschier, J. , et al. , 312 Nature 326-330 (1984) (Genentech); Wood, W.I., et al.. 312 Nature 330-337 (1984) (Genentech); Vehar, G.A. , et al.. 312 Nature 337-342 (1984) (Genentech)), the teachings of each of which are incorporated herein, and the amino acid sequence was deduced from cDNA. U.S. Patent No. 4,965,199 to Capon et al., discloses a recombinant DNA method for producing factor VIII in mammalian host cells and purification of human factor VIII. Factor VIII expression in CHO (Chinese hamster ovary) cells and BHKC (baby hamster kidney cells) has been reported. The cDNA sequence encoding human factor VIII and predicted amino acid sequence are shown below. Human factor VIII cDNA sequence (SEQ ID NO. 3 on Patentin disk) : CAGTGGGTAA GTTCCTTAAA TGCTCTGCAA AGAAATTGGG ACTTTTCATT AAATCAGAAA 60 TTTTACTTTT TTCCCCTCCT GGGAGCTAAA GATATTTTAG AGAAGAATTA ACCTTTTGCT 120 TCTCCAGTTG AACATTTGTA GCAATAAGTC ATGCAAATAG AGCTCTCCAC CTGCTTCTTT 180 CTGTGCCTTT TGCGATTCTG CTTTAGTGCC ACCAGAAGAT ACTACCTGGG TGCAGTGGAA 240 CTGTCATGGG ACTATATGCA AAGTGATCTC GGTGAGCTGC CTGTGGACGC AAGATTTCCT 300 CCTAGAGTGC CAAAATCTTT TCCATTCAAC ACCTCAGTCG TGTACAAAAA GACTCTGTTT 360 GTAGAATTCA CGGTTCACCT TTTCAACATC GCTAAGCCAA GGCCACCCTG GATGGGTCTG 420 CTAGGTCCTA CCATCCAGGC TGAGGTTTAT GATACAGTGG TCATTACACT TAAGAACATG 480 GCTTCCCATC CTGTCAGTCT TCATGCTGTT GGTGTATCCT ACTGGAAAGC TTCTGAGGGA 540 GCTGAATATG ATGATCAGAC CAGTCAAAGG GAGAAAGAAG ATGATAAAGT CTTCCCTGGT 600 GGAAGCCATA CATATGTCTG GCAGGTCCTG AAAGAGAATG GTCCAATGGC CTCTGACCCA 660 CTGTGCCTTA CCTACTCATA TCTTTCTCAT GTGGACCTGG TAAAAGACTT GAATTCAGGC 720 CTCATTGGAG CCCTACTAGT ATGTAGAGAA GGGAGTCTGG CCAAGGAAAA GACACAGACC 780 TTGCACAAAT TTATACTACT TTTTGCTGTA TTTGATGAAG GGAAAAGTTG GCACTCAGAA 840 ACAAAGAACT CCTTGATGCA GGATAGGGAT GCTGCATCTG CTCGGGCCTG GCCTAAAATG 900 CACACAGTCA ATGGTTATGT AAACAGGTCT CTGCCAGGTC TGATTGGATG CCACAGGAAA 960 TCAGTCTATT GGCATGTGAT TGGAATGGGC ACCACTCCTG AAGTGCACTC AATATTCCTC 1020 GAAGGTCACA CATTTCTTGT GAGGAACCAT CGCCAGGCGT CCTTGGAAAT CTCGCCAATA 1080 ACTTTCCTTA CTGCTCAAAC ACTCTTGATG GACCTTGGAC AGTTTCTACT GTTTTGTCAT 1140 ATCTCTTCCC ACCAACATGA TGGCATGGAA GCTTATGTCA AAGTAGACAG CTGTCCAGAG 1200 GAACCCCAAC TACGAATGAA AAATAATGAA GAAGCGGAAG ACTATGATGA TGATCTTACT 1260 GATTCTGAAA TGGATGTGGT CAGGTTTGAT GATGACAACT CTCCTTCCTT TATCCAAATT 1320 CGCTCAGTTG CCAAGAAGCA TCCTAAAACT TGGGTACATT ACATTGCTGC TGAAGAGGAG 1380 GACTGGGACT ATGCTCCCTT AGTCCTCGCC CCCGATGACA GAAGTTATAA AAGTCAATAT 1440 TTGAACAATG GCCCTCAGCG GATTGGTAGG AAGTACAAAA AAGTCCGATT TATGGCATAC 1500 ACAGATGAAA CCTTTAAGAC TCGTGAAGCT ATTCAGCATG AATCAGGAAT CTTGGGACCT 1560 TTACTTTATG GGGAAGTTGG AGACACACTG TTGATTATAT TTAAGAATCA AGCAAGCAGA 1620 CCATATAACA TCTACCCTCA CGGAATCACT GATGTCCGTC CTTTGTATTC AAGGAGATTA 1680 CCAAAAGGTG TAAAACATTT GAAGGATTTT CCAATTCTGC CAGGAGAAAT ATTCAAATAT 1740 AAATGGACAG TGACTGTAGA AGATGGGCCA ACTAAATCAG ATCCTCGGTG CCTGACCCGC 1800 TATTACTCTA GTTTCGTTAA TATGGAGAGA GATCTAGCTT CAGGACTCAT TGGCCCTCTC 1860 CTCATCTGCT ACAAAGAATC TGTAGATCAA AGAGGAAACC AGATAATGTC AGACAAGAGG 1920 AATGTCATCC TGTTTTCTGT ATTTGATGAG AACCGAAGCT GGTACCTCAC AGAGAATATA 1980 CAACGCTTTC TCCCCAATCC AGCTGGAGTG CAGCTTGAGG ATCCAGAGTT CCAAGCCTCC 2040 AACATCATGC ACAGCATCAA TGGCTATGTT TTTGATAGTT TGCAGTTGTC AGTTTGTTTG 2100 CATGAGGTGG CATACTGGTA CATTCTAAGC ATTGGAGCAC AGACTGACTT CCTTTCTGTC 2160 TTCTTCTCTG GATATACCTT CAAACACAAA ATGGTCTATG AAGACACACT CACCCTATTC 2220 CCATTCTCAG GAGAAACTGT CTTCATGTCG ATGGAAAACC CAGGTCTATG GATTCTGGGG 2280 TGCCACAACT CAGACTTTCG GAACAGAGGC ATGACCGCCT TACTGAAGGT TTCTAGTTGT 2340 GACAAGAACA CTGGTGATTA TTACGAGGAC AGTTATGAAG ATATTTCAGC ATACTTGCTG 2400 AGTAAAAACA ATGCCATTGA ACCAAGAAGC TTCTCCCAGA ATTCAAGACA CCCTAGCACT 2460 AGGCAAAAGC AATTTAATGC CACCACAATT CCAGAAAATG ACATAGAGAA GACTGACCCT 2520 TGGTTTGCAC ACAGAACACC TATGCCTAAA ATACAAAATG TCTCCTCTAG TGATTTGTTG 2580 ATGCTCTTGC GACAGAGTCC TACTCCACAT GGGCTATCCT TATCTGATCT CCAAGAAGCC 2640 AAATATGAGA CTTTTTCTGA TGATCCATCA CCTGGAGCAA TAGACAGTAA TAACAGCCTG 2700 TCTGAAATGA CACACTTCAG GCCACAGCTC CATCACAGTG GGGACATGGT ATTTACCCCT 2760 GAGTCAGGCC TCCAATTAAG ATTAAATGAG AAACTGGGGA CAACTGCAGC AACAGAGTTG 2820 AAGAAACTTG ATTTCAAAGT TTCTAGTACA TCAAATAATC TGATTTCAAC AATTCCATCA 2880 GACAATTTGG CAGCAGGTAC TGATAATACA AGTTCCTTAG GACCCCCAAG TATGCCAGTT 2940 CATTATGATA GTCAATTAGA TACCACTCTA TTTGGCAAAA AGTCATCTCC CCTTACTGAG 3000 TCTGGTGGAC CTCTGAGCTT GAGTGAAGAA AATAATGATT CAAAGTTGTT AGAATCAGGT 3060 TTAATGAATA GCCAAGAAAG TTCATGGGGA AAAAATGTAT CGTCAACAGA GAGTGGTAGG 3120 TTATTTAAAG GGAAAAGAGC TCATGGACCT GCTTTGTTGA CTAAAGATAA TGCCTTATTC 3180 AAAGTTAGCA TCTCTTTGTT AAAGACAAAC AAAACTTCCA ATAATTCAGC AACTAATAGA 3240 AAGACTCACA TTGATGGCCC ATCATTATTA ATTGAGAATA GTCCATCAGT CTGGCAAAAT 3300 ATATTAGAAA GTGACACTGA GTTTAAAAAA GTGACACCTT TGATTCATGA CAGAATGCTT 3360 ATGGACAAAA ATGCTACAGC TTTGAGGCTA AATCATATGT CAAATAAAAC TACTTCATCA 3420 AAAAACATGG AAATGGTCCA ACAGAAAAAA GAGGGCCCCA TTCCACCAGA TGCACAAAAT 3480 CCAGATATGT CGTTCTTTAA GATGCTATTC TTGCCAGAAT CAGCAAGGTG GATACAAAGG 3540 ACTCATGGAA AGAACTCTCT GAACTCTGGG CAAGGCCCCA GTCCAAAGCA ATTAGTATCC 3600 TTAGGACCAG AAAAATCTGT GGAAGGTCAG AATTTCTTGT CTGAGAAAAA CAAAGTGGTA 3660 GTAGGAAAGG GTGAATTTAC AAAGGACGTA GGACTCAAAG AGATGGTTTT TCCAAGCAGC 3720 AGAAACCTAT TTCTTACTAA CTTGGATAAT TTACATGAAA ATAATACACA CAATCAAGAA 3780 AAAAAAATTC AGGAAGAAAT AGAAAAGAAG GAAACATTAA TCCAAGAGAA TGTAGTTTTG 3840 CCTCAGATAC ATACAGTGAC TGGCACTAAG AATTTCATGA AGAACCTTTT CTTACTGAGC 3900 ACTAGGCAAA ATGTAGAAGG TTCATATGAG GGGGCATATG CTCCAGTACT TCAAGATTTT 3960 AGGTCATTAA ATGATTCAAC AAATAGAACA AAGAAACACA CAGCTCATTT CTCAAAAAAA 4020 GGGGAGGAAG AAAACTTGGA AGGCTTGGGA AATCAAACCA AGCAAATTGT AGAGAAATAT 4080 GCATGCACCA CAAGGATATC TCCTAATACA AGCCAGCAGA ATTTTGTCAC GCAACGTAGT 4140 AAGAGAGCTT TGAAACAATT CAGACTCCCA CTAGAAGAAA CAGAACTTGA AAAAAGGATA 4200 ATTGTGGATG ACACCTCAAC CCAGTGGTCC AAAAACATGA AACATTTGAC CCCGAGCACC 4260 CTCACACAGA TAGACTACAA TGAGAAGGAG AAAGGGGCCA TTACTCAGTC TCCCTTATCA 4320 GATTGCCTTA CGAGGAGTCA TAGCATCCCT CAAGCAAATA GATCTCCATT ACCCATTGCA 4380 AAGGTATCAT CATTTCCATC TATTAGACCT ATATATCTGA CCAGGGTCCT ATTCCAAGAC 4440 AACTCTTCTC ATCTTCCAGC AGCATCTTAT AGAAAGAAAG ATTCTGGGGT CCAAGAAAGC 4500 AGTCATTTCT TACAAGGAGC CAAAAAAAAT AACCTTTCTT TAGCCATTCT AACCTTGGAG 4560 ATGACTGGTG ATCAAAGAGA GGTTGGCTCC CTGGGGACAA GTGCCACAAA TTCAGTCACA 4620 TACAAGAAAG TTGAGAACAC TGTTCTCCCG AAACCAGACT TGCCCAAAAC ATCTGGCAAA 4680 GTTGAATTGC TTCCAAAAGT TCACATTTAT CAGAAGGACC TATTCCCTAC GGAAACTAGC 4740 AATGGGTCTC CTGGCCATCT GGATCTCGTG GAAGGGAGCC TTCTTCAGGG AACAGAGGGA 4800 GCGATTAAGT GGAATGAAGC AAACAGACCT GGAAAAGTTC CCTTTCTGAG AGTAGCAACA 4860 GAAAGCTCTG CAAAGACTCC CTCCAAGCTA TTGGATCCTC TTGCTTGGGA TAACCACTAT 4920 GGTACTCAGA TACCAAAAGA AGAGTGGAAA TCCCAAGAGA AGTCACCAGA AAAAACAGCT 4980 TTTAAGAAAA AGGATACCAT TTTGTCCCTG AACGCTTGTG AAAGCAATCA TGCAATAGCA 5040 GCAATAAATG AGGGACAAAA TAAGCCCGAA ATAGAAGTCA CCTGGGCAAA GCAAGGTAGG 5100 ACTGAAAGGC TGTGCTCTCA AAACCCACCA GTCTTGAAAC GCCATCAACG GGAAATAACT 5160 CGTACTACTC TTCAGTCAGA TCAAGAGGAA ATTGACTATG ATGATACCAT ATCAGTTGAA 5220 ATGAAGAAGG AAGATTTTGA CATTTATGAT GAGGATGAAA ATCAGAGCCC CCGCAGCTTT 5280 CAAAAGAAAA CACGACACTA TTTTATTGCT GCAGTGGAGA GGCTCTGGGA TTATGGGATG 5340 AGTAGCTCCC CACATGTTCT AAGAAACAGG GCTCAGAGTG GCAGTGTCCC TCAGTTCAAG 5400 AAAGTTGTTT TCCAGGAATT TACTGATGGC TCCTTTACTC AGCCCTTATA CCGTGGAGAA 5460 CTAAATGAAC ATTTGGGACT CCTGGGGCCA TATATAAGAG CAGAAGTTGA AGATAATATC 5520 ATGGTAACTT TCAGAAATCA GGCCTCTCGT CCCTATTCCT TCTATTCTAG CCTTATTTCT 5580 TATGAGGAAG ATCAGAGGCA AGGAGCAGAA CCTAGAAAAA ACTTTGTCAA GCCTAATGAA 5640 ACCAAAACTT ACTTTTGGAA AGTGCAACAT CATATGGCAC CCACTAAAGA TGAGTTTGAC 5700 TGCAAAGCCT GGGCTTATTT CTCTGATGTT GACCTGGAAA AAGATGTGCA CTCAGGCCTG 5760 ATTGGACCCC TTCTGGTCTG CCACACTAAC ACACTGAACC CTGCTCATGG GAGACAAGTG 5820 ACAGTACAGG AATTTGCTCT GTTTTTCACC ATCTTTGATG AGACCAAAAG CTGGTACTTC 5880 ACTGAAAATA TGGAAAGAAA CTGCAGGGCT CCCTGCAATA TCCAGATGGA AGATCCCACT 5940 TTTAAAGAGA ATTATCGCTT CCATGCAATC AATGGCTACA TAATGGATAC ACTACCTGGC 6000 TTAGTAATGG CTCAGGATCA AAGGATTCGA TGGTATCTGC TCAGCATGGG CAGCAATGAA 6060 AACATCCATT CTATTCATTT CAGTGGACAT GTGTTCACTG TACGAAAAAA AGAGGAGTAT 6120 AAAATGGCAC TGTACAATCT CTATCCAGGT GTTTTTGAGA CAGTGGAAAT GTTACCATCC 6180 AAAGCTGGAA TTTGGCGGGT GGAATGCCTT ATTGGCGAGC ATCTACATGC TGGGATGAGC 6240 ACACTTTTTC TGGTGTACAG CAATAAGTGT CAGACTCCCC TGGGAATGGC TTCTGGACAC 6300 ATTAGAGATT TTCAGATTAC AGCTTCAGGA CAATATGGAC AGTGGGCCCC AAAGCTGGCC 6360 AGACTTCATT ATTCCGGATC AATCAATGCC TGGAGCACCA AGGAGCCCTT TTCTTGGATC 6420 AAGGTGGATC TGTTGGCACC AATGATTATT CACGGCATCA AGACCCAGGG TGCCCGTCAG 6480 AAGTTCTCCA GCCTCTACAT CTCTCAGTTT ATCATCATGT ATAGTCTTGA TGGGAAGAAG 6540 TGGCAGACTT ATCGAGGAAA TTCCACTGGA ACCTTAATGG TCTTCTTTGG CAATGTGGAT 6600 TCATCTGGGA TAAAACACAA TATTTTTAAC CCTCCAATTA TTGCTCGATA CATCCGTTTG 6660 CACCCAACTC ATTATAGCAT TCGCAGCACT CTTCGCATGG AGTTGATGGG CTGTGATTTA 6720 AATAGTTGCA GCATGCCATT GGGAATGGAG AGTAAAGCAA TATCAGATGC ACAGATTACT 6780 GCTTCATCCT ACTTTACCAA TATGTTTGCC ACCTGGTCTC CTTCAAAAGC TCGACTTCAC 6840 CTCCAAGGGA GGAGTAATGC CTGGAGACCT CAGGTGAATA ATCCAAAAGA GTGGCTGCAA 6900 GTGGACTTCC AGAAGACAAT GAAAGTCACA GGAGTAACTA CTCAGGGAGT AAAATCTCTG 6960 CTTACCAGCA TGTATGTGAA GGAGTTCCTC ATCTCCAGCA GTCAAGATGG CCATCAGTGG 7020 ACTCTCTTTT TTCAGAATGG CAAAGTAAAG GTTTTTCAGG GAAATCAAGA CTCCTTCACA 7080 CCTGTGGTGA ACTCTCTAGA CCCACCGTTA CTGACTCGCT ACCTTCGAAT TCACCCCCAG 7140 AGTTGGGTGC ACCAGATTGC CCTGAGGATG GAGGTTCTGG GCTGCGAGGC ACAGGACCTC 7200 TACTGAGGGT GGCCACTGCA GCACCTGCCA CTGCCGTCAC CTCTCCCTCC TCAGCTCCAG 7260 GGCAGTGTCC CTCCCTGGCT TGCCTTCTAC CTTTGTGCTA AATCCTAGCA GACACTGCCT 7320 TGAAGCCTCC TGAATTAACT ATCATCAGTC CTGCATTTCT TTGGTGGGGG GCCAGGAGGG 7380 TGCATCCAAT TTAACTTAAC TCTTACCTAT TTTCTGCAGC TGCTCCCAGA TTACTCCTTC 7440 CTTCCAATAT AACTAGGCAA AAAGAAGTGA GGAGAAACCT GCATGAAAGC ATTCTTCCCT 7500 GAAAAGTTAG GCCTCTCAGA GTCACCACTT CCTCTGTTGT AGAAAAACTA TGTGATGAAA 7560 CTTTGAAAAA GATATTTATG ATGTTAACAT TTCAGGTTAA GCCTCATACG TTTAAAATAA 7620 AACTCTCAGT TGTTTATTAT CCTGATCAAG CATGGAACAA AGCATGTTTC AGGATCAGAT 7680 CAATACAATC TTGGAGTCAA AAGGCAAATC ATTTGGACAA TCTGCAAAAT GGAGAGAATA 7740 CAATAACTAC TACAGTAAAG TCTGTTTCTG CTTCCTTACA CATAGATATA ATTATGTTAT 7800 TTAGTCATTA TGAGGGGCAC ATTCTTATCT CCAAAACTAG CATTCTTAAA CTGAGAATTA 7860 TAGATGGGGT TCAAGAATCC CTAAGTCCCC TGAAATTATA TAAGGCATTC TGTATAAATG 7920 CAAATGTGCA TTTTTCTGAC GAGTGTCCAT AGATATAAAG CCATTGGTCT TAATTCTGAC 7980 CAATAAAAAA ATAAGTCAGG AGGATGCAAT TGTTGAAAGC TTTGAAATAA AATAACATGT 8040 CTTCTTGAAA TTTGTGATGG CCAAGAAAGA AAATGATGAT GACATTAGGC TTCTAAAGGA 8100 CATACATTTA ATATTTCTGT GGAAATATGA GGAAAATCCA TGGTTATCTG AGATAGGAGA 8160 TACAAACTTT GTAATTCTAA TAATGCACTC AGTTTACTCT CTCCCTCTAC TAATTTCCTG 8220 CTGAAAATAA CACAACAAAA ATGTAACAGG GGAAATTATA TACCGTGACT GAAAACTAGA 8280 GTCCTACTTA CATAGTTGAA ATATCAAGGA GGTCAGAAGA AAATTGGACT GGTGAAAACA 8340 GAAAAAACAC TCCAGTCTGC CATATCACCA CACAATAGGA TCCCCCTTCT TGCCCTCCAC 8400 CCCCATAAGA TTGTGAAGGG TTTACTGCTC CTTCCATCTG CCTGCACCCC TTCACTATGA 8460 CTACACAGAA CTCTCCTGAT AGTAAAGGGG GCTGGAGGCA AGGATAAGTT ATAGAGCAGT 8520 TGGAGGAAGC ATCCAAAGAC TGCAACCCAG GGCAAATGGA AAACAGGAGA TCCTAATATG 8580 AAAGAAAAAT GGATCCCAAT CTGAGAAAAG GCAAAAGAAT GGCTACTTTT TTCTATGCTG 8640 GAGTATTTTC TAATAATCCT GCTTGACCCT TATCTGACCT CTTTGGAAAC TATAACATAG 8700 CTGTCACAGT ATAGTCACAA TCCACAAATG ATGCAGGTGC AAATGGTTTA TAGCCCTGTG 8760 AAGTTCTTAA AGTTTAGAGG CTAACTTACA GAAATGAATA AGTTGTTTTG TTTTATAGCC 8820 CGGTAGAGGA GTTAACCCCA AAGGTGATAT GGTTTTATTT CCTGTTATGT TTAACTTGAT 8880 AATCTTATTT TGGCATTCTT TTCCCATTGA CTATATACAT CTCTATTTCT CAAATGTTCA 8940 TGGAACTAGC TCTTTTATTT TCCTGCTGGT TTCTTCAGTA ATGAGTTAAA TAAAACATTG 9000 ACACATACA 9009 Predicted human factor VIII amino acid sequence (SEQ ID NO. 4 on Patent In disk) : ATRRYYLGAV ELSWDYMQSD LGELPVDARF PPRVPKSFPF NTSWYKKTL FVEFTVHLFN 60 IAKPRPPWMG LLGPTIQAEV YDTVVITLKN MASHPVSLHA VGVSYWKASE GAEYDDQTSQ 120 REKEDDKVFP GGSHTYVWQV LKENGPMASD PLCLTYSYLS HVDLVKDLNS GLIGALLVCR 180 EGSLAKEKTQ TLHKFILLFA VFDEGKSWHS ETKNSLMQDR DAASARAWPK MHTVNGYVNR 240 SLPGLIGCHR KSVYWHVIGM GTTPEVHSIF LEGHTFLVRN HRQASLEISP ITFLTAQTLL 300 MDLGQFLLFC HISSHQHDGM EAYVKVDSCP EEPQLRMKNN EEAEDYDDDL TDSEMDWRF 360 DDDNSPSFIQ IRSVAKKHPK TWVHYIAAEE EDWDYAPLVL APDDRSYKSQ YLNNGPQRIG 420 RKYKKVRFMA YTDETFKTRE AIQHESGILG PLLYGEVGDT LLIIFKNQAS RPYNIYPHGI 480 TDVRPLYSRR LPKGVKHLKD FPILPGEIFK YKWTVTVEDG PTKSDPRCLT RYYSSFVNME 540 RDLASGLIGP LLICYKESVD QRGNQIMSDK RNVILFSVFD ENRSWYLTEN IQRFLPNPAG 600 VQLEDPEFQA SNIMHSINGY VFDSLQLSVC LHEVAYWYIL SIGAQTDFLS VFFSGYTFKH 660 KMVYEDTLTL FPFSGETVFM SMENPGLWIL GCHNSDFRNR GMTALLKVSS CDKNTGDYYE 720 DSYEDISAYL LSKNNAIEPR SFSQNSRHPS TRQKQFNATT IPENDIEKTD PWFAHRTPMP 780 KIQNVSSSDL LMLLRQSPTP HGLSLSDLQE AKYETFSDDP SPGAIDSNNS LSEMTHFRPQ 840 LHHSGDMVFT PESGLQLRLN EKLGTTAATE LKKLDFKVSS TSNNLISTIP SDNLAAGTDN 900 TSSLGPPSMP VHYDSQLDTT LFGKKSSPLT ESGGPLSLSE ENNDSKLLES GLMNSQESSW 960 GKNVSSTESG RLFKGKRAHG PALLTKDNAL FKVSISLLKT NKTSNNSATN RKTHIDGPSL 1020 LIENSPSVWQ NILESDTEFK KVTPLIHDRM LMDKNATALR LNHMSNKTTS SKNMEMVQQK 1080 KEGPIPPDAQ NPDMSFFKML FLPESARWIQ RTHGKNSLNS GQGPSPKQLV SLGPEKSVEG 1140 QNFLSEKNKV WGKGEFTKD VGLKEMVFPS SRNLFLTNLD NLHENNTHNQ EKKIQEEIEK 1200 KETLIQENW LPQIHTVTGT KNFMKNLFLL STRQNVEGSY EGAYAPVLQD FRSLNDSTNR 1260 TKKHTAHFSK KGEEENLEGL GNQTKQIVEK YACTTRISPN TSQQNFVTQR SKRALKQFRL 1320 PLEETELEKR IIVDDTSTQW SKNMKHLTPS TLTQIDYNEK EKGAITQSPL SDCLTRSHSI 1380 PQANRSPLPI AKVSSFPSIR PIYLTRVLFQ DNSSHLPAAS YRKKDSGVQE SSHFLQGAKK 1440 NNLSLAILTL EMTGDQREVG SLGTSATNSV TYKKVENTVL PKPDLPKTSG KVELLPKVHI 1500 YQKDLFPTET SNGSPGHLDL VEGSLLQGTE GAIKWNEANR PGKVPFLRVA TESSAKTPSK 1560 LLDPLAWDNH YGTQIPKEEW KSQEKSPEKT AFKKKDTILS LNACESNHAI AAINEGQNKP 1620 EIEVTWAKQG RTERLCSQNP PVLKRHQREI TRTTLQSDQE EIDYDDTISV EMKKEDFDIY 1680 DEDENQSPRS FQKKTRHYFI AAVERLWDYG MSSSPHVLRN RAQSGSVPQF KKWFQEFTD 1740 GSFTQPLYRG ELNEHLGLLG PYIRAEVEDN IMVTFRNQAS RPYSFYSSLI SYEEDQRQGA 1800 EPRKNFVKPN ETKTYFWKVQ HHMAPTKDEF DCKAWAYFSD VDLEKDVHSG LIGPLLVCHT 1860 NTLNPAHGRQ VTVQEFALFF TIFDETKSWY FTENMERNCR APCNIQMEDP TFKENYRFHA 1920 INGYIMDTLP GLVMAQDQRI RWYLLSMGSN ENIHSIHFSG HVFTVRKKEE YKMALYNLYP 1980 GVFETVEMLP SKAGIWRVEC LIGEHLHAGM STLFLVYSNK CQTPLGMASG HIRDFQITAS 2040 GQYGQWAPKL ARLHYSGSIN AWSTKEPFSW IKVDLLAPMI IHGIKTQGAR QKFSSLYISQ 2100 FIIMYSLDGK KWQTYRGNST GTLMVFFGNV DSSGIKHNIF NPPIIARYIR LHPTHYSIRS 2160 TLRMELMGCD LNSCSMPLGM ESKAISDAQI TASSYFTNMF ATWSPSKARL HLQGRSNAWR 2220 PQVNNPKEWL QVDFQKTMKV TGVTTQGVKS LLTSMYVKEF LISSSQDGHQ WTLFFQNGKV 2280 KVFQGNQDSF TPWNSLDPP LLTRYLRIHP QSWVHQIALR MEVLGCEAQDLY Recombinant hybrid human/porcine factor VIII is prepared starting with human cDNA (Biogen, Inc.) encoding the factor VIII sequence corresponding to domains A1-A2-A3-C1-C2. This cDNA lacks the entire B domain and corresponds to residues 1-740 and 1649-2332 of single chain human factor VIII, according to the numbering system of Wood et al. , 312 Nature 330-337 (1984) , the teachings of which are incorporated herein. The B domain is deleted, since it does not appear to be necessary for biological function. Porcine factor VIII has been isolated and purified from plasma (Fass, D.N. , et al. , 59 Blood 594 (1982) . The amino acid sequence of the B and part of the A2 domains of porcine factor VIII, as reported by Toole, J.J., et al.. 83 Proc. Nat'l. Acad. Sci. U.S.A. 5939-5942 (1986) , the teachings of which are incorporated herein, and the corresponding genomic DNA sequence are shown below. The coding region in the nucleotide sequence begins at position 675 (GGT CTC TGG . . .) , which corresponds to amino acids (Gly-Leu- Tyr) , the NH2 terminal amino acids. Genomic DNA sequence of the B and part of the A2 domains of porcine factor VIII (SEQ ID NO. 5 on Patentin disk: GAATTCTTCA CTCAGATTCT CCTGTTCACA GTAGAAATTC AGTATTGTTA GCACTCTTTT 60 AGTTACCTGT ATCCTAAACC TAAGTCCTGC TCCCTTATAC TTACTCATCC TACAAATTGG 120 TCAGAGTATG TGTTTGGCAT TATGTTATGT GATTTGAATG CATTATCAGA TACTACTAGT 180 CTCATTTACA AATTAGAAAA CTGGAGCTCA GAGAGTTCCT TGGACTTGCT TAAAGCAACA 240 CAGCTGGTAA ATTGTATAGC TAGGATTCGA ACCGAGGCAA TCGTACTCTA GAACCCATGC 300 CACTATGTTG CATAGCATAA TAGCCCGCCT ATATAAACTT GGCTGAATTA AGTCACGATC 360 TATCATCACC AAAGAGTCCG TGTGACTAAG AGTCTCAACT ATTGTATGTC AATTATATTT 420 CTCCATTTTT ATCCCAATAT ATATTCATTT AAATCACAGC CCTTTCTTGT GGTCACAAAC 480 AGGTACACTA GAGCCATGGT TGGGCTGCAG TCCATGGTGT ACATTTAACC CAACGACCTC 540 GATATAATGG TACCGACTAG TGTTTTGTTT TTGTTTTTGT TTCATTTTTC TGGGAATAGA 600 AGAGAACCTC TAACACAGAT CTTGCTTGGG ACCTGGGCTG TGAGTAACCA GAGTTTTATT 660 CTTCCTTATC TCCAGGTCTC TGGGTCCTAG GGTGCCACAA CTCAGACTTG CGGAACAGAG 720 GGATGACAGC CTTACTGAAG GTGTATAGTT GTGACAGGGA CACTGGTGAT TATTATGACA 780 ACACTTATGA AGATATTCCA GGCTTCTTGC TGAGTGGAAA GAATGTCATT GAACCCAGAA 840 GCTTTGCCCA GAATTCAAGA CCCCCTAGTG CGAGCCAAAA GCAATTCCAA ACCATCACAA 900 GTCCAGAAGA TGACGTGGAG CTTGACCCGC AGTCTGGAGA GAGAACCCAA GCACTGGAAG 960 AACTAAGTGT CCCCTCTGGT GATGGGTCGA TGCTCTTGGG ACAGAATCCT GCTCCACATG 1020 GCTCATCCTC ATCTGATCTT CAAGAAGCCA GGAATGAGGC TGATGATTAT TTACCTGGAG 1080 CAAGAGAAAG AAACACGGCC CCATCCGCAG CGGCACGTCT CAGACCAGAG CTGCATCACA 1140 GTGCCGAAAG AGTACTTACT CCTGAGCCAG AGAAAGAGTT GAAGAAACTT GATTCTTAAA 1200 TGTCTAGTTC ATCAGACCTT CTAAAGACTT CGCCAACAAT TCCATCAGAC ACGTTGTCAG 1260 Predicted amino acid sequence of the B and part of the A2 domains of porcine factor VIII, based on genomic DNA sequence above (SEQ ID NO. 6 in Patentin disk): (Amino acid residues labeled "Xaa" represent deletions in porcine B domain relative to human B domain.) Gly Leu Trp Val Leu Gly Cys His Met Ser Asp Leu Arg Asn Arg Gly 1 5 10 15 Met Thr Ala Leu Leu Lys Val Tyr Ser Cys Asp Arg Asp Thr Gly Asp 20 25 30 Tyr Tyr Asp Asn Thr Tyr Glu Asp Leu Pro Gly Phe Leu Leu Ser Gly 35 40 45 Lys Asn Val lie Glu Pro Arg Ser Phe Ala Gin Asn Ser Arg Pro Pro 50 55 60 Ser Ala Ser Gin Lys Gin Phe Gin Thr lie Thr Ser Pro Glu Asp Asp 65 70 75 80 Val Glu Leu Xaa Asp Pro Gin Ser Gin Glu Arg Thr Gin Ala Leu Glu 85 90 95 Glu Leu Ser Val Pro Ser Gly Asp Gly Ser Met Leu Leu Gly Gin Asn 100 105 110 Asp Val Leu Phe Lys Val Asn He Ser Leu Val Lys Thr Asn Lys Ala 305 310 315 320 Arg Val Tyr Leu Lys Thr Asn Arg Lys He His He Asp Asp Ala Ala 325 330 335 Leu Leu Thr Glu Asn Arg Ala Ser Ala Thr Phe Met Asp Lys Asn Thr 340 345 350 Thr Ala Ser Gly Leu Asn His Val Ser Asn Xaa Xaa Xaa Xaa Xaa Xaa 355 360 365 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 370 375 380 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 385 390 395 400 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 405 410 415 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Trp He Lys Gly Pro Leu Gly Lys 420 425 430 Asn Pro Leu Ser Ser Glu Arg Gly Pro Ser Pro Glu Leu Leu Thr Ser 435 440 445 Ser Gly Ser Gly Lys Ser Val Lys Gly Gin Ser Ser Gly Gin Gly Arg 450 455 460 He Arg Val Ala Val Glu Glu Glu Glu Leu Ser Lys Gly Xaa Xaa Xaa 465 470 475 480 Lys Glu Met Met Leu Pro Asn Ser Glu Leu Thr Phe Leu Thr Asn Ser 485 490 495 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 690 695 700 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 705 710 715 720 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 725 730 735 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Glu Ser Ser Pro He Leu 740 745 750 Gin Gly Ala Lys Arg Asn Asn Leu Ser Leu Pro Phe Leu Thr Leu Glu 755 760 765 Met Ala Gly Gly Gin Gly Lys He Ser Ala Leu Gly Lys Ser Ala Ala 770 775 7,80 Gly Pro Leu Ala Ser Gly Lys Leu Glu Lys Ala Val Leu Ser Ser Ala 785 790 795 800 Gly Leu Ser Glu Ala Ser Gly Lys Ala Glu Phe Leu Pro Lys Val Arg 805 810 815 Val His Arg Glu Asp Leu Leu Pro Gin Lys Thr Ser Asn Val Ser Cys 820 825 830 Ala His Gly Asp He Gly Gin Glu He Phe Leu Gin Lys Thr Arg Gly 835 840 845 Pro Val Asn Leu Asn Lys Val Asn Arg Pro Gly Arg Xaa Xaa Xaa Xaa 850 855 860 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Thr Pro Ser Lys Leu Leu Gly 865 870 875 880 Pro Pro Met Pro Lys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Glu 885 890 895 Trp Glu Ser Leu Glu Lys Ser Pro Lys Ser Thr Ala Leu Arg Thr Lys 900 905 910 Asp He Leu Ser Leu Pro Leu Asp Arg His Glu Ser Asn His Ser He 915 920 925 Ala Ala Lys Asn Glu Gly Gin Ala Phe Thr Gin Arg Glu Ala Ala Trp 930 935 940 Thr Lys Gin Gly Gly Pro Gly Arg Leu Cys Ala Pro Lys Pro Pro Val 945 950 955 960 Leu Arg Arg His Gin Arg Asp He Ser Leu Pro Thr Pro Gin Pro Glu 965 970 975 Glu Asp Lys Met Asp Tyr Asp Asp He Phe Ser Thr Glu Thr Lys Gly 980 985 990 Glu Asp Phe Asp He Tyr Gly Glu Asp Glu Asn Gin Asp Pro Arg Ser 995 1000 1005 Phe Gin Lys Arg Thr Arg His Tyr Phe He Ala Ala Val Glu Gin Leu 1010 1015 1020 Trp Asp Tyr Gly Met Ser Glu Ser Pro Arg Ala Leu Arg Asn Arg Ala 1025 1030 1035 1040 Gin Asn Gly Glu Val Pro Arg Phe Lys Lys Val Val Phe Arg Glu Phe 1045 1050 1055 Ala Asp Gly Ser Phe Thr Asn Pro Ser Tyr Arg Gly Glu Leu Asn Lys 1060 1065 1070 His Leu Gly Leu Leu Gly Pro Tyr He Arg Ala Glu Val Glu Asp Asn 1075 1080 1085 He Met 1090 Both porcine and human factor VIII are isolated from plasma as a two subunit protein. FIG. 1 (prior art) illustrates diagrammatically the subunit structure of the molecule. The subunits, known as the heavy chain and light chain, are held together by a non-covalent bond that requires calcium or other divalent metal ions. The heavy chain of factor VIII contains three domains, Al, A2, and B, which are linked covalently. The light chain of factor VIII also contains three domains designated A3, Cl, and C2. The B domain has no known function and can be removed from the molecule proteolytically or by recombinant DNA technology methods without significant alteration in any measurable parameter of factor VIII. Human recombinant factor VIII has a similar structure and function to plasma-derived factor VIII, though it is not glycosylated unless expressed in mammalian cells. Both human and porcine activated factor VIII (factor Villa) have three subunits due to cleavage of the heavy chain between the Al and A2 domains. This structure is designated A1/A2/A3-C1-C2. Human factor Villa is not stable under the conditions that stabilize porcine factor Villa. This is because of the weaker association of the A2 subunit of human factor Villa. Dissociation of the A2 subunit of human and porcine factor Villa is associated with loss of activity. Since the nucleotide sequence of the porcine B domain is known, full length hybrids can be constructed. Individual domains of porcine factor VIII cDNA can be cloned and substituted for the corresponding human domains by established mutagenesis techniques. These factor VIII cDNA molecules can be cloned into expression vectors for ultimate expression of active hybrid human/porcine factor VIII protein molecules. The complete A2 domain of porcine factor VIII, homologous to residues 372-740 in mature human factor VIII, was sequenced and the amino acid sequence was predicted. These sequences are shown below. Sense Strand Nucleotide Sequence of A2 Domain of Factor VIII (SEQ ID NO. l on Patent In disk) : TAAGCACCCT AAGACGTGGG TGCACTACAT CTCTGCAGAG GAGGAGGACT GGGACTACGC 60 CCCCGCGGTC CCCAGCCCCA GTGACAGAAG TTATAAAAGT CTCTACTTGA ACAGTGGTCC 120 TCAGCGAATT GGTAGGAAAT ACAAAAAAGC TCGATTCGTC GCTTACACGG ATGTAACATT 180 TAAGACTCGT AAAGCTATTC CGTATGAATC AGGAATCCTG GGACCTTTAC TTTATGGAGA 240 AGTTGGAGAC ACACTTTTGA TTATATTTAA GAATAAAGCG AGCCGACCAT ATAACATCTA 300 CCCTCATGGA ATCACTGATG TCAGCGCTTT GCACCCAGGG AGACTTCTAA AAGGTTGGAA 360 ACATTTGAAA GACATGCCAA TTCTGCCAGG AGAGACTTTC AAGTATAAAT GGACAGTGAC 420 TGTGGAAGAT GGGCCAACCA AGTCCGATCC TCGGTGCCTG ACCCGdTACT ACTCGAGCTC 480 CATTAATCTA GAGAAAGATC TGGCTTCGGG ACTCATTGGC CCTCTCCTCA TCTGCTACAA 540 AGAATCTGTA GACCAAAGAG GAAACCAGAT GATGTCAGAC AAGAGAAACG TCATCCTGTT 600 TTCTGTATTC GATGAGAATC AAAGCTGGTA CCTCGCAGAG AATATTCAGC GCTTCCTCCC 660 CAATCCGGAT GGATTACAGC CCCAGGATCC AGAGTTCCAA GCTTCTAACA TCATGCACAG 720 CATCAATGGC TATGTTTTTG A AGCTTGCA GCTGTCGGTT TGTTTGCACG AGGTGGCATA 780 CTGGTACATT CTAAGTGTTG GAGCACAGAC GGACTTCCTC TCCGTCTTCT TCTCTGGCTA 840 CACCTTCAAA CACAAAATGG TCTATGAAGA CACACTCACC CTGTTCCCCT TCTCAGGAGA 900 AACGGTCTTC ATGTCAATGG AAAACCCAGG TCTCTGGGTC CTAGGGTGCC ACAACTCAGA 960 CTTGCGGAAC AGAGGGATGA CAGCCTTACT GAAGGTGTAT AGTTGTGACA GGGACATTGG 1020 TGATTATTAT GACAACACTT ATGAAGATAT TCCAGGCTTC TTGCTGAGTG GAAAGAATGT 1080 CATTGAACCC AGAAGCTTTG CCCAGAATTC AAGACCCCCT AGTGCGAGCA 1130 Predicted Amino Acid Sequence of A2 domain of Porcine Factor VIII (Defined as residues homologous to human factor VIII sequence 373-740, derived from cDNA sequence except as noted) (Underlined residues are from known porcine amino acid sequence) (SEQ ID NO.2 on Patentin disk): VAKKHPKTWV HYISAEEEDW DYAPAVPSPS DRSYKSLYLN SGPQRIGRKY KKARFVAYTD 60 VTFKTRKAIP YESGILGP1L LYGEVGDTLL IIFKNKASRP YNIYPHGITD VSALHPGRLL 120 KGWKHLKDMP ILPGETFKYK WTVTVEDGPT SDPRCLTRYY SSSINLEKDL ASGLIGPLLI 180 CYKESVDQRG NQMMSDKRNV ILFSVFDENQ SWYLAENIQR FLPNPDGLQP QDPEFQASNI 240 MHSINGYVFD LQLSVCLHEV AYWYILSVGA QTDFLSVFFS GYTFKHKMVY EDTLTLFPFS 300 GETVFMSMEN PGLWVLGCHN SDLRNRGMTA LLKVYSCDRD IGDYYDNTYE DIPGFLLSGK 360 NVIEPR - Pharmaceutical Compositions Pharmaceutical compositions containing hybrid human/porcine factor VIII, alone or in combination with appropriate pharmaceutical stabilization compounds, delivery vehicles, and/or carrier vehicles, are prepared according to known methods, as described in Remington's Pharmaceutical Sciences by E.W. Martin, the teachings of which are incorporated herein. In one preferred embodiment, the preferred carriers or delivery vehicles for intravenous infusion are physiological saline or phosphate buffered saline. In another preferred embodiment, suitable stabilization compounds, delivery vehicles, and carrier vehicles include but are not limited to other human or porcine proteins such as albumin. Phospholipid vesicles or liposomal suspensions are also preferred as pharmaceutically acceptable carriers or delivery vehicles. These can be prepared according to methods known to those skilled in the art and can contain, for example, phosphatidylserine/- phosphatidylcholine or other compositions of phospholipids or detergents that together impart a negative charge to the surface, since factor VIII binds to negatively charged phospholipid membranes. Liposomes may be prepared by dissolving appropriate lipid(s) (such as stearoyl phosphatidyl ethanolamine, stearoyl phosphatidyl choline, arachadoyl phosphatidyl choline, and cholesterol) in an inorganic solvent that is then evaporated, leaving behind a thin film of dried lipid on the surface of the container. An aqueous solution of the hybrid human/porcine factor VIII is then introduced into the container. The container is then swirled by hand to free lipid material from the sides of the container and to disperse lipid aggregates, thereby forming the liposomal suspension. The hybrid human/porcine factor VIII can be combined with other suitable stabilization compounds, delivery vehicles, and/or carrier vehicles, including vitamin K dependent clotting factors, tissue factor, and von Willebrand factor (vWf) or a fragment of vWf that contains the factor VIII binding site, and polysaccharides such as sucrose. Hybrid human/porcine factor VIII can also be delivered by gene therapy in the same way that human factor VIII can be delivered, using delivery means such as retroviral vectors. This method consists of incorporation of factor VIII cDNA into human cells that are transplanted directly into a factor VIII deficient patient or that are placed in an implantable device, permeable to the factor VIII molecules but impermeable to cells, that is then transplanted. The preferred method will be retroviral-mediated gene transfer. In this method, an exogenous gene (e.g., a factor VIII cDNA) is cloned into the genome of a modified retrovirus. The gene is inserted into the genome of the host cell by viral machinery where it will be expressed by the cell. The retroviral vector is modified so that it will not produce virus, preventing viral infection of the host. The general principles for this type of therapy are known to those skilled in the art and have been reviewed in the literature (e.g., Kohn, D.B., and P.W. Kantoff, 29 Transfusion 812-820, 1989) . Hybrid human/porcine factor VIII can be stored bound to vWf to increase the half-life and shelf-life of the hybrid molecule. Additionally, lyophilization of factor VIII can improve the yields of active molecules in the presence of vWf. Current methods for storage of human and porcine factor VIII used by commercial suppliers can be employed for storage of hybrid human/porcine factor VIII. These methods include: (1) lyophilization of factor VIII in a partially-purified state (as a factor VIII "concentrate" that is infused without further purification) ; (2) immunoaffinity-purification of factor VIII by the Zimmerman method and lyophilization in the presence of albumin, which stabilizes the factor VIII; (3) lyophilization of recombinant factor VIII in the presence of albumin. Additionally, hybrid human/porcine factor VIII has been indefinitely stable at 4° C in 0.6 M NaCI, 20 mM MES, and 5mM CaCl 2 at pH 6.0 and also can be stored frozen in these buffers and thawed with minimal loss of activity. - Method of Treatment Hybrid human/porcine factor VIII is used to treat uncontrolled bleeding due to factor VIII deficiency (e.g., intraarticular, intracranial, or gastrointestinal hemorrhage) in hemophiliacs with and without inhibitory antibodies and in patients with acquired factor VIII deficiency due to the development of inhibitory antibodies. The active materials are preferably administered intravenously. Additionally, hybrid human/porcine factor VIII can be administered by transplant of cells genetically engineered to produce the hybrid or by implantation of a device containing such cells, as described above. In a preferred embodiment, pharmaceutical compositions of hybrid human/porcine factor VIII alone or in combination with stabilizers, delivery vehicles, and/or carriers are infused into patients intravenously according to the same procedure that is used for infusion of human or porcine factor VIII. The treatment dosages of hybrid human/porcine factor VIII composition that must be administered to a patient in need of such treatment will vary depending on the severity of the factor VIII deficiency. Generally, dosage level is adjusted in frequency, duration, and units in keeping with the severity and duration of each patient's bleeding episode. Accordingly, the hybrid human/porcine factor VIII is included in the pharmaceutically acceptable carrier, delivery vehicle, or stabilizer in an amount sufficient to deliver to a patient a therapeutically effective amount of the hybrid to stop bleeding, as measured by standard clotting assays. Usually, the desired plasma factor VIII level to be achieved in the patient through administration of the hybrid human/porcine factor VIII is in the range of 30-100% of normal. In a preferred mode of administration of the hybrid human/porcine factor VIII, the composition is given intravenously at a preferred dosage in the range from about 20 to 50 units/kg body weight; the interval frequency is in the range from about 8 to 24 hours (in severely affected hemophiliacs) ; and the duration of treatment in days is in the range from 1 to 10 days or until the bleeding episode is resolved. See, e . g. , Roberts, H.R. , and M.R. Jones, "Hemophilia and Related Conditions - Congenital Deficiencies of Prothrombin (Factor II, Factor V, and Factors VII to XII)," Ch. 153, 1453-1474, 1460, in Hematology. Williams, W. J. , et al., ed. , 1990. Patients with inhibitors may require more hybrid human/porcine factor VIII, or patients may require less hybrid human/porcine factor VIII because of its higher specific activity than human factor VIII. As in treatment with human or porcine factor VIII, the amount of factor VIII infused is defined by the one-stage factor VIII coagulation assay and, in selected instances, in vivo recovery is determined by measuring the factor VIII in the patient's plasma after infusion. It is to be understood that for any particular subject, specific dosage regimens should be adjusted over time according to the individual need and the professional judgment of the person administering or supervising the administration of the compositions, and that the concentration ranges set forth herein are exemplary only and are not intended to limit the scope or practice of the claimed composition. Treatment can take the form of a single intravenous administration of the composition or periodic or continuous administration over an extended period of time, as required. Alternatively, hybrid human/porcine factor VIII can be administered subcutaneously or orally with liposomes in one or several doses at varying intervals of time. The hybrid human/porcine factor VIII molecule and the methods for isolation, characterization, making, and using it generally described above will be further understood with reference to the following non- limiting examples. Example 1: Assay of porcine factor VIII and hybrid human/porcine factor VIII Porcine f ctor VIII has more coagulant activity than human factor VIII, based on specific activity of the molecule. These results are shown in Table II in Example 4. This conclusion is based on the use of appropriate standard curves that allow human and porcine factor VIII to be fairly compared. Coagulation assays are based on the ability of factor VIII to shorten the clotting time of plasma derived from a patient with hemophilia A. Two types of assays were employed: the one-stage and the two-stage assay. In the one-stage assay, 0.1 ml hemophilia A plasma (George King Biomedical, Inc.) was incubated with 0.1 ml activated partial thromboplastin reagent (APTT) (Organon Teknika) and 0.01 ml sample or standard, consisting of diluted, citrated normal human plasma, for 5 min at 37°C in a water bath. Incubation was followed by addition of 0.1 ml 20 mM CaCl 2 , and the time for development of a fibrin clot was determined by visual inspection. A unit of factor VIII is defined as the amount present in 1 ml of citrated normal human plasma. With human plasma as the standard, porcine and human factor VIII activity were compared directly. Dilutions of the plasma standard or purified proteins were made into 0.15 M NaCI, 0.02 M HEPES, pH 7.4. The standard curve was constructed based on 3 or 4 dilutions of plasma, the highest dilution being 1/50, and on log 10 clotting time plotted against log 10 plasma concentration, which results in a linear plot. The units of factor VIII in an unknown sample were determined by interpolation from the standard curve. The one-stage assay relies on endogenous activation of factor VIII by activators formed in the hemophilia A plasma, whereas the two-stage assay measures the procoagulant activity of preactivated factor VIII. In the two-stage assay, samples containing factor " VIII that had been reacted with thrombin were added to a mixture of activated partial thromboplastin and human hemophilia A plasma that had been preincubated for 5 min at 37°C. The resulting clotting times were then converted to units/ml, based on the same human standard curve described above. The relative activity in the two-stage assay was higher than in the one-stage assay because the factor VIII had been preactivated. Example 2 : Characterization of the functional difference between human and porcine factor VIII . The isolation of porcine and human plasma-derived factor VIII and human recombinant factor VIII have been described in the literature. Fulcher, C. A. , and T. S. Zimmerman, 79 Proc. Nat'I. Acad. Sci. U.S.A. 1648-1652 (1982); Toole, J.J. , et al.. 312 Nature 342- 347 (1984) (Genetics Institute); Gitschier, J. , et al. , 312 Nature 326-330 (1984) (Genentech); Wood, W.I., et al.. 312 Nature 330-337 (1984) (Genentech); Vehar, G.A., et al.. 312 Nature 337-342 (1984) (Genentech); Fass, D.N., et al.. 59 Blood 594 (1982); Toole, J.J., et al. , 83 Proc. Nat'l. Acad. Sci. U.S.A. 5939-5942 (1986) . This can be accomplished in several ways. All these preparations are similar in subunit composition, although this is the first description of the functional difference between human and porcine factor VIII, not noted previously in part due to the lack of use of a common standard by which to compare them. For comparison of human recombinant and porcine factor VIII, preparations of highly-purified human recombinant factor VIII (Cutter Laboratories, Berkeley, CA) and porcine factor VIII (immunopurified as described in Fass, D.N. , et al. , 59 Blood 594 (1982)) were subjected to high-pressure liquid chromatography (HPLC) over a Mono Q™ (Pharmacia-LKB, Piscataway, NJ) anion-exchange column (Pharmacia, Inc.) . The purposes of the Mono Q™ HPLC step were . elimination of minor impurities and exchange of human and porcine factor VIII into a common buffer for comparative purposes. Vials containing 1000-2000 units of factor VIII were reconstituted with 5 ml H 2 0. Hepes (2 M at pH 7.4) was then added to a final concentration of 0.02 M. Factor VIII was applied to a Mono Q™ HR 5/5 column equilibrated in 0.15 M NaCI, 0.02 M Hepes, 5 mM CaCl 2 , at pH 7.4 (Buffer A plus 0.15 M NaCI) ; washed with 10 ml Buffer A + 0.15 M NaCI; and eluted with a 20 ml linear gradient, 0.15 M to 0.90 M NaCI in Buffer A at a flow rate of 1 ml/min. For comparison of human factor VIII (derived from plasma and purified by Mono Q™ HPLC) and porcine factor VIII, immunoaffinity-purified, plasma-derived porcine factor VIII was diluted 1:4 with 0.04 M Hepes, 5 mM CaCl 2 , 0.01% Tween-80, at pH 7.4, and subjected to Mono Q™ HPLC under the same conditions described in the previous paragraph for human factor VIII. These procedures for the isolation of human and porcine factor VIII are standard for those skilled in the art. Column fractions were assayed for factor VIII activity by a one-stage coagulation assay. The average results of the assays, expressed in units of activity per A 280 of material, are given in Table I, and indicate that porcine factor VIII has at least six times greater activity than human factor VIII when the one-stage assay is used. TABLE I: COMPARISON OF HUMAN AND PORCINE FACTOR VIII COAGULANT ACTIVITY Activity (U/A 280 ) Porcine 21,300 Human plasma-derived 3,600 Human recombinant 2,400 Example 3 : Comparison of the stability of human and porcine factor Villa The results of the one-stage assay for factor VIII reflect activation of factor VIII to factor Villa in the sample and possibly loss of formed factor Villa activity. A direct comparison of the stability of human and porcine factor VIII was made. Samples from Mono Q™ HPLC were diluted to the same concentration and buffer composition and reacted with thrombin. At various times, samples were removed for two-stage coagulation assay. Typically, peak activity (at 2 min) was 10-fold greater for porcine than human factor Villa, and the activities of both porcine and human factor Villa subsequently decreased, with human factor Villa activity decreasing more rapidly. Generally, attempts to isolate stable human factor Villa are not successful even when conditions that produce stable porcine factor Villa are used. To demonstrate this. Mono Q™ HPLC-purified human factor VIII was activated with thrombin and subjected to Mono S™ cation-exchange (Pharmacia, Inc.) HPLC under conditions that produce stable porcine factor Villa (Lollar, J.S., and Parker, C.G., 28 Biochemistry 666, 1989, the teachings of which are incorporated herein) . Human factor VIII, 43 μg/ml (0.2 μM) in 0.2 M NaCI, 0.01 M Hepes, 2.5 mM CaCl 2 , at pH 7.4, in 10 ml total volume, was reacted with thrombin (0.036 μM) for 10 min, at which time FPR-CH 2 C1 D-phenyl-prolyl- arginyl-chloromethyl ketone was added to a concentration of 0.2 μM for irreversible inactivation of thrombin. The mixture then was diluted 1:1 with 40 mM 2-(N-morpholino)ethane sulfonic acid (MES) , 5 mM CaCl 2 , at pH 6.0, and loaded at 2 ml/min onto a Mono S™ HR 5/5 HPLC column equilibrated in 5 mM MES, 5 mM CaCl 2 , at pH 6.0 (Buffer B) plus 0.1 M NaCI. Factor Villa was eluted without column washing with a 20 ml gradient from 0.1 M NaCI to 0.9 M NaCI in Buffer B at 1 ml/min. The fraction with coagulant activity in the two- stage assay eluted as a single peak under these conditions. The specific activity of the peak fraction was approximately 7,500 U/A 280 . Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) of the Mono S™ factor Villa peak, followed by silver staining of the protein, revealed two bands corresponding to a heterodimeric (A3-C1-C2/A1) derivative of factor VIII. Although the A2 fragment was not identified by silver staining under these conditions because of its low concentration, it was identified as a trace constituent by 125 I-labeling. In contrast to the results with human factor VIII, porcine factor Villa isolated by Mono S™ HPLC under the same conditions had a specific activity 1.6 x 10 6 U/A 280 . Analysis of porcine factor Villa by SDS- PAGE revealed 3 fragments corresponding to Al, A2, and A3-C1-C2 subunits, demonstrating that porcine factor Villa possesses three subunits. The results of Mono S™ HPLC of human thrombin- activated factor VIII preparations at pH 6.0 indicate that human factor Villa is labile under conditions that yield stable porcine factor Villa. However, although trace amounts of A2 fragment were identified in the peak fraction, determination of whether the coagulant activity resulted from small amounts of heterotrimeric factor Villa or from heterodimeric factor Villa that has a low specific activity was not possible from this method alone. A way to isolate human factor Villa before it loses its A2 subunit is desirable to resolve this question. To this end, isolation was accomplished in a procedure that involves reduction of the pH of the Mono S™ buffers to pH 5. Mono Q™-purified human factor VIII (0.5 mg) was diluted with H 2 0 to give a final composition of 0.25 mg/ml (1 μM) factor VIII in 0.25 M NaCI, 0.01 M Hepes, 2.5 mM CaCl 2 , 0.005% Tween- 80, at pH 7.4 (total volume 7.0 ml). Thrombin was added to a final concentration of 0.072 μM and allowed to react for 3 min. Thrombin was then inactivated with FPR-CH 2 C1 (0.2 μM) . The mixture then was diluted 1:1 with 40 mM sodium acetate, 5 mM CaCl 2 , 0.01% Tween- 80, at pH 5.0, and loaded at 2 ml/min onto a Mono S™ HR 5/5 HPLC column equilibrated in 0.01 M sodium acetate, 5 mM CaCl 2 , 0.01% Tween-80, at pH 5.0, plus 0.1 M NaCI. Factor Villa was eluted without column washing with a 20 ml gradient from 0.1 M NaCI to 1.0 M NaCI in the same buffer at 1 ml/min. This resulted in recovery of coagulant activity in a peak that contained detectable amounts of the A2 fragment as shown by SDS-PAGE and silver staining. The specific activity of the peak fraction was ten-fold greater than that recovered at pH 6.0 (75,000 U/A 280 vs. 7,500 U/A 280 ) . However, in contrast to porcine factor Villa isolated at pH 6.0, which is indefinitely stable at 4°C, human factor Villa activity decreased steadily over a period of several hours after elution from Mono S™. Additionally, the specific activity of factor Villa puri ied at pH 5.0 and assayed immediately is only 5% that of porcine factor Villa, indicating that substantial dissociation occurred prior to assay. These results demonstrate that both human and porcine factor Villa are composed of three subunits (Al, A2, and A3-C1-C2) . Dissociation of the A2 subunit is responsible for the loss of activity of both human and porcine factor Villa under certain conditions, such as physiological ionic strength, pH, and concentration. The relative stability of porcine factor Villa under certain conditions is because of stronger association of the A2 subunit. Example 4: Preparation of hybrid human/ porcine factor VIII. Porcine factor VIII light chains and factor VIII heavy chains were isolated as follows. A 0.5 M solution of EDTA at pH 7.4 was added to Mono Q™- purified porcine factor VIII to a final concentration of 0.05 M and was allowed to stand at room temperature for 18-24 h. An equal volume of 10 mM histidine-Cl, 10 mM EDTA, 0.02% v/v Tween 80, at pH 6.0 (Buffer B) , was added, and the solution was applied at 1 ml/min to a Mono S™ HR 5/5 column previously equilibrated in Buffer A plus 0.25 M NaCI. Factor VIII heavy chains did not bind the resin, as judged by SDS-PAGE. Factor VIII light chain was eluted with a linear, 20 ml, 0.1- 0.7 M NaCI gradient in Buffer A at 1 ml/min and was homogeneous by SDS-PAGE. Factor VIII heavy chains were isolated by mono Q™ HPLC in the following way. Factor VIII heavy chains do not adsorb to mono S™ during the purification of factor VIII light chains. The fall-through material that contained factor VIII heavy chains was adjusted to pH 7.2 by addition of 0.5 M Hepes buffer, pH 7.4, and applied to a mono Q™ HR5/5 HPLC column equilibrated in 0.1 M NaCI, 0.02 M Hepes, 0.01% Tween-80, pH 7.4. The column was washed with 10 mL of this buffer, and factor VIII heavy chains were eluted with a 20 mL 0.1-1.0 M NaCI gradient in this buffer. Human light chains and heavy chains were isolated in the same manner. Human and porcine light and heavy chains were reconstituted according to the following steps. Ten μl human or porcine factor VIII light chain, 100 μg/ml, was mixed in 1 M NaCI, 0.02 M Hepes, 5 mM CaCl 2 , 0.01% Tween-80, pH 7.4, with (1) 25 μl heterologous heavy chain, 60 μg/ml, in the same buffer; (2) 10 μl 0.02 M Hepes, 0.01% Tween-80, pH 7.4; (3) 5 μl 0.6 M CaCl 2 , for 14 hr at room temperature. The mixture was diluted 1/4 with 0.02 M MES, 0.01% Tween-80, 5 mM CaCl 2 , pH 6, and applied ~ to Mono S™ Hr5/5 equilibrated in 0.1 M NaCI, 0.02 M MES, 0.01% Tween-80, 5mM CaCl 2 , pH 6.0. A 20 ml gradient was run from 0.1 - 1.0 M NaCI in the same buffer at 1 ml/min, and 0.5 ml fractions were collected. Absorbance was read at 280 nm of fractions, and fractions were assayed with absorbance for factor VIII activity by the one-stage clotting assay. Heavy chains were present in excess, because free light chain (not associated with heavy chain) also binds Mono S™; excess heavy chains ensure that free light chains are not part of the preparation. Reconstitution experiments followed by Mono S™ HPLC purification were performed with all four possible combinations of chains: human light chain/human heavy chain, human light chain/porcine heavy chain, porcine light chain/porcine heavy chain, porcine light chain/human heavy chain. Table II shows that human light chain/porcine heavy chain factor VIII has activity comparable to native porcine factor VIII (Table I) , indicating that structural elements in the porcine heavy chain are responsible for the increased coagulant activity of porcine factor VIII compared to human factor VIII. TABLE II: COMPARISON OF HYBRID HUMAN/PORCINE FACTOR VIII COAGULANT ACTIVITY WITH HUMAN AND PORCINE FACTOR VIII Activity (U/A 280 ) Porcine light chain/porcine heavy chain 30,600 Human light chain/porcine heavy chain 44,100 Porcine light chain/human heavy chain 1,100 Human light chain/human heavy chain 1,000 Example 5: Isolation and sequencing of the A2 domain of porcine factor VIII. Only the B domain and part of the A2 domain of porcine factor VIII have been sequenced previously (Toole, J.J., et al.. 83 Proc. Nat'l. Acad. Sci. U.S.A. 5939-5942 (1986)). The genomic DNA sequence of the porcine factor VIII B domain and the cDNA sequence for the entire porcine factor VIII A2 domain are disclosed herein. The porcine factor VIII A2 domain was cloned by reverse transcription of porcine spleen total RNA and PCR amplification; degenerate primers based on the known human factor VIII cDNA sequence and an exact porcine primer based on a part of the porcine factor VIII sequence were used. A 1 kb PCR product was isolated and amplified by insertion into a Bluescript ™ (Stratagene) phagemid vector. The porcine A2 domain was completely sequenced by dideoxy sequencing. The sequence is as described above. Example 6: Preparation of recombinant hybrid human/ porcine factor VIII The sequence of human factor VIII has been described in the literature (Toole, J.J., et al.. 312 Nature 342-347 (1984) (Genetics Institute) ; Gitschier, J. , et al. , 312 Nature 326-330 (1984) (Genentech) ; Wood, W.I., et al.. 312 Nature 330-337 (1984) (Genentech); Vehar, G.A., et al.. 312 Nature 337-342 (1984) (Genentech)). The sequence is as described above. Making recombinant hybrid human/porcine factor VIII requires that a region of human factor VIII cDNA (Biogen Corp.) be removed and the homologous porcine cDNA sequence inserted. Subsequently, the hybrid cDNA is expressed in an appropriate expression system. In these experiments, for example, the entire cDNA sequence corresponding to the A2 domain of human factor VIII is removed by oligonucleotide-mediated mutagenesis, a method commonly known to those skilled in the art (see, e . g. , Sambrook, J. , E.F. Fritsch, and T. Maniatis, Molecular Cloning: A Laboratory Manual. Chapter 15, Cold Spring Harbor Press, Cold Spring Harbor, 1989) . The steps were as follows: E . coli CJ236 cells were transformed with Bluescript™ phage containing the human factor VIII cDNA insert. Single-stranded Bluescript™/human factor VIII circular DNA was produced with M13K07 helper phage and then purified by standard methods (Sambrook, J. , E.F. Fritsch, and T. Maniatis, Molecular Cloning: A Laboratory Manual, Chapter 4, Cold Spring Harbor Press, Cold Spring Harbor, 1989) . A utagenic oligonucleotide was synthesized corresponding to the 3' end of the Al domain and the 5' end of the A3 domain: 5' CCTTCCTTTATCCAAATACGTAGATCAAGAGGAAATTGAC 3' . Additionally this oligonucleotide provides a SnaBl restriction site that can be used to insert the porcine A2 domain. On hybridization of this oligonucleotide to single strand Bluescript™/human factor VIII, the region between the Al and A3 domains, i.e, the A2 domain, was "looped out." The resulting heteroduplex was extended to circular, double-stranded DNA by use of T7 polymerase, ligated, and used to transform E. coli XLl-blue™ (Stratagene) cells. Transformants were screened by isolation of phagemid DNA from several colonies, Xhol digestion, and examination of the size of phagemid DNA by agarose gel electrophoresis. Three clones were identified that were shorter than human factor VIII/Bluescript™ by 1 kb, as expected for deletion of the 1 kb A2 domain. The results were confirmed by sequencing across the boundaries of the Al and A3 domains. The porcine A2 domain has been inserted between the Al and A3 domains of the human factor VIII cDNA by (1) PCR amplification of the porcine A2 domain; (2) gel purification of the PCR product (agarose gel electrophoresis of the PCR product producing a band visualized by ethidium bromide staining, followed by excision of the band and purification of the DNA to remove agarose and other contaminants) ; and (3) ligation by using T4 DNA ligase of the porcine A2 cDNA to the human A2-domainless cDNA linearized by using, the SnaBl restriction site. The primers used for PCR amplification of the porcine A2 were as follows: 5' primer: 5' GTAGCGTTGCCAAGAAGCACCCTAAGACG 3' 3' primer: 5' GAAGAGTAGTACGAGTTATTTCTCTGG GTTCAATGAC 3'. The 3' primer contains nucleotides corresponding to residues 736-740 of the porcine factor VIII protein sequence (at the C-terminus of the A2 domain) , and residues 1649-1656 of the human factor VIII sequence (at the N-terminus of the A3 domain) . The A3 sequence residues were included because the looping out procedure removed these residues. The ligated product was used to transform XLl-Blue cells, producing several colonies that contained the desired porcine A2 insert when analyzed by PCR. The product contains an unwanted thymine at the A1-A2 junction as a result of the PCR amplification of the porcine A2 domain. This single base can be looped out by use of the mutagenic oligonucleotide 5' CCTTTATCCAAATACGTAGCGTTTGCCAAGAAG 3' , and the product can be cloned exactly as described above (Under Example 6, paragraph 3) for the production of human A2-deficient cDNA. Cloning of the porcine Al, A3, Cl, and C2 domains is feasible with the same strategy that was used for cloning the porcine A2 domain. Fragments of these domains can be cloned by the looping out mutagenesis technique. Excision of the corresponding domains in human factor VIII and any fragments thereof, including single amino acid eliminations, is feasible by looping out mutagenesis as described above. All possible domain replacements, fragments of domain replacements, or single amino acid residue replacements are possible by this approach. The biological activity of recombinant hybrid human/porcine factor VIII can be evaluated initially by use of a COS-cell mammalian transient expression system. Hybrid human/porcine cDNA can be transfected into COS cells, and supernatants can be analyzed for factor VIII activity by use of one-stage and two-stage coagulation assays as described above in Example 1. Additionally, factor VIII activity can be measured by use of a chromogenic substrate assay, which is more sensitive and allows analysis of larger numbers of samples. This assay has been described (Lollar, P., G.J. Knutson, and D.N. Fass, 24 Biochemistry 8056- 8064, 1985). Similar assays are standard in the assay of factor VIII activity (Wood, W.I., et al . , 312 Nature 330-337, 1984; Toole, J.J. , et al . , 312 Nature 342-347, 1984) . Expression of recombinant factor VIII in COS cells is a standard procedure (Toole, J.J., et al . , 312 Nature 342-347, 1984; Pittman, D.D., and R.J. Kaufman, 85 Proc. Nat'l. Acad. Sci. USA 2429-2433, 1988) . The human factor VIII cDNA used as starting material for the recombinant molecules described herein has been expressed in COS cells yielding a product with biological activity. This material will be used a standard to compare hybrid human/porcine factor VIII molecules. The activity in the assays is converted to a specific activity for proper comparison of the hybrid molecules. For this, a measurement of the mass of factor VIII produced by the cells is necessary and can be done by immunoassay with purified human and/or porcine factor VIII as standards. Immunoassays for factor VIII are routine for those skilled in the art (See, e .g. , Lollar, P., et al . , 71 Blood 137-143, 1988). Sequences of human and porcine factor VIII likely to be involved as epitopes (i.e., as recognition sites for inhibitory antibodies) can be determined through use of commercially available predictive computer programs, such as MacVector (IBI Corp., New Haven, CT) . Sequences of porcine factor VIII that are not antigenic compared to corresponding (homologous) antigenic human sequences will be identified, and substitutions will be made to insert porcine sequences and delete human sequences according to standard recombinant DNA methods. It is already known that porcine factor VIII reacts less than human factor VIII with some inhibitory antibodies; this provides a basis for current therapy for patients with inhibitors. After the recombinant hybrids are made, they will be tested in vitro for reactivity with the Bethesda inhibitor assay. Those constructs that are less reactive than native human factor VIII and native porcine factor VIII will be candidates for replacement therapy. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: Lollar, John S. Runge, Marschall S. (ii) TITLE OF INVENTION: Hybrid Human/Porcine Factor VIII (iii) NUMBER OF SEQUENCES: 6 (iv) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: Kilpatrick & Cody (B) STREET: 1100 Peachtree Street, Suite 2800 (C) CITY: Atlanta (D) STATE: Georgia (E) COUNTRY: US (F) ZIP: 30309-4530 (v) 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 (vi) CURRENT APPLICATION DATA: (A) APPLICATION NUMBER: (B) FILING DATE: (C) CLASSIFICATION: (vii) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: US 07/864004 (B) FILING DATE: 07-APR-1992 (viii) ATTORNEY/AGENT INFORMATION: (A) NAME: Pabst, Patrea L. (B) REGISTRATION NUMBER: 31,284 (C) REFERENCE/DOCKET NUMBER: EMU 106PCT (ix) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: 404-815-6508 (B) TELEFAX: 404-815-6555 (2) INFORMATION FOR SEQ ID NO:l: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1130 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (v) FRAGMENT TYPE: N-terminal (vi) ORIGINAL SOURCE: (A) ORGANISM: Porcine (F) TISSUE TYPE: Blood (xi) SEQUENCE DESCRIPTION: SEQ ID NO:l: TAAGCACCCT AAGACGTGGG TGCACTACAT CTCTGCAGAG GAGGAGGACT GGGACTACGC 60 CCCCGCGGTC CCCAGCCCCA GTGACAGAAG TTATAAAAGT CTCTACTTGA ACAGTGGTCC 120 TCAGCGAATT GGTAGGAAAT ACAAAAAAGC TCGATTCGTC GCTTACACGG ATGTAACATT 180 TAAGACTCGT AAAGCTATTC CGTATGAATC AGGAATCCTG GGACCTTTAC TTTATGGAGA 240 AGTTGGAGAC ACACTTTTGA TTATATTTAA GAATAAAGCG AGCCGACCAT ATAACATCTA 300 CCCTCATGGA ATCACTGATG TCAGCGCTTT GCACCCAGGG AGACTTCTAA AAGGTTGGAA 360 ACATTTGAAA GACATGCCAA TTCTGCCAGG AGAGACTTTC AAGTATAAAT GGACAGTGAC 420 TGTGGAAGAT GGGCCAACCA AGTCCGATCC TCGGTGCCTG ACCCGCTACT ACTCGAGCTC 480 CATTAATCTA GAGAAAGATC TGGCTTCGGG ACTCATTGGC CCTCTCCTCA TCTGCTACAA 540 AGAATCTGTA GACCAAAGAG GAAACCAGAT GATGTCAGAC AAGAGAAACG TCATCCTGTT 600 TTCTGTATTC GATGAGAATC AAAGCTGGTA CCTCGCAGAG AATATTCAGC GCTTCCTCCC 660 CAATCCGGAT GGATTACAGC CCCAGGATCC AGAGTTCCAA GCTTCTAACA TCATGCACAG 720 CATCAATGGC TATGTTTTTG ATAGCTTGCA GCTGTCGGTT TGTTTGCACG AGGTGGCATA 780 CTGGTACATT CTAAGTGTTG GAGCACAGAC GGACTTCCTC TCCGTCTTCT TCTCTGGCTA 840 CACCTTCAAA CACAAAATGG TCTATGAAGA CACACTCACC CTGTTCCCCT TCTCAGGAGA 900 AACGGTCTTC ATGTCAATGG AAAACCCAGG TCTCTGGGTC CTAGGGTGCC ACAACTCAGA 960 CTTGCGGAAC AGAGGGATGA CAGCCTTACT GAAGGTGTAT AGTTGTGACA GGGACATTGG 1020 TGATTATTAT GACAACACTT ATGAAGATAT TCCAGGCTTC TTGCTGAGTG GAAAGAATGT 1080 CATTGAACCC AGAAGCTTTG CCCAGAATTC AAGACCCCCT AGTGCGAGCA 1130 (2) INFORMATION FOR SEQ ID NO:2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 367 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (v) FRAGMENT TYPE: N-terminal (Vi) ORIGINAL SOURCE: (A) ORGANISM: Porcine (F) TISSUE TYPE: Spleen (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2: Val Ala Lys Lys His Pro Lys Thr Trp Val His Tyr He Ser Ala Glu 1 5 10 15 Glu Glu Asp Trp Asp Tyr Ala Pro Ala Val Pro Ser Pro Ser Asp Arg 20 25 30 Ser Tyr Lys Ser Leu Tyr Leu Asn Ser Gly Pro Gin Arg He Gly Arg 35 40 45 Lys Tyr Lys Lys Ala Arg Phe Val Ala Tyr Thr Asp Val Thr Phe Lys 50 55 60 Thr Arg Lys Ala He Pro Tyr Glu Ser Gly He Leu Gly Pro Leu Leu 65 70 75 80 Tyr Gly Glu Val Gly Asp Thr Leu Leu He He Phe Lys Asn Lys Ala 85 90 95 Ser Arg Pro Tyr Asn He Tyr Pro His Gly He Thr Asp Val Ser Ala Leu His Pro Gly Arg Leu Leu Lys Gly Trp Lys His Leu Lys Asp Met 115 120 125 Pro He Leu Pro Gly Glu Thr Phe Lys Tyr Lys Trp Thr Val Thr Val 130 135 140 Glu Asp Gly Pro Thr Lys Ser Asp Pro Arg Cys Leu Thr Arg Tyr Tyr 145 150 155 160 Ser Ser Ser He Asn Leu Glu Lys Asp Leu Ala Ser Gly Leu He Gly 165 170 175 Pro Leu Leu He Cys Tyr Lys Glu Ser Val Asp Gin Arg Gly Asn Gin 180 185 190 Met Met Ser Asp Lys Arg Asn Val He Leu Phe Ser Val Phe Asp Glu 195 200 205 Asn Gin Ser Trp Tyr Leu Ala Glu Asn He Gin Arg Phe Leu Pro Asn 210 215 220 Pro Asp Gly Leu Gin Pro Gin Asp Pro Glu Phe Gin Ala Ser Asn He 225 230 235 240 Met His Ser He Asn Gly Tyr Val Phe Asp Ser Leu Gin Leu Ser Val 245 250 255 Cys Leu His Glu Val Ala Tyr Trp Tyr He Leu Ser Val Gly Ala Gin 260 265 270 Thr Asp Phe Leu Ser Val Phe Phe Ser Gly Tyr Thr Phe Lys His Lys 275 " 280 285 Met Val Tyr Glu Asp Thr Leu Thr Leu Phe Pro Phe Ser Gly Glu Thr 290 295 300 Val Phe Met Ser Met Glu Asn Pro Gly Leu Trp Val Leu Gly Cys His 305 310 315 320 Asn Ser Asp Leu Arg Asn Arg Gly Met Thr Ala Leu Leu Lys Val Tyr 325 330 335 Ser Cys Asp Arg Asp He Gly Asp Tyr Tyr Asp Asn Thr Tyr Glu Asp 340 345 350 He Pro Gly Phe Leu Leu Ser Gly Lys Asn Val He Glu Pro Arg (2) INFORMATION FOR SEQ ID NO:3: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 9009 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (v) FRAGMENT TYPE: N-terminal (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo sapien (F) TISSUE TYPE: Liver (ix) FEATURE: (A) NAME/KEY: misc_feature (B) LOCATION: 5001..7053 (D) OTHER INFORMATION: /note= "Domain Structure: Equivalent to the A3-C1-C2 domain" (ix) FEATURE: (A) NAME/KEY: misc_feature (B) LOCATION: 1..2277 (D) OTHER INFORMATION: /note= "Domain Structure: Equivalent to the A1-A2 domain" (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3: CAGTGGGTAA GTTCCTTAAA TGCTCTGCAA AGAAATTGGG ACTTTTCATT AAATCAGAAA 60 TTTTACTTTT TTCCCCTCCT GGGAGCTAAA GATATTTTAG AGAAGAATTA ACCTTTTGCT 120 TCTCCAGTTG AACATTTGTA GCAATAAGTC ATGCAAATAG AGCTCTCCAC CTGCTTCTTT 180 CTGTGCCTTT TGCGATTCTG CTTTAGTGCC ACCAGAAGAT ACTACCTGGG TGCAGTGGAA 240 CTGTCATGGG ACTATATGCA AAGTGATCTC GGTGAGCTGC CTGTGGACGC AAGATTTCCT 300 CCTAGAGTGC CAAAATCTTT TCCATTCAAC ACCTCAGTCG TGTACAAAAA GACTCTGTTT 360 GTAGAATTCA CGGTTCACCT TTTCAACATC GCTAAGCCAA GGCCACCCTG GATGGGTCTG 420 CTAGGTCCTA CCATCCAGGC TGAGGTTTAT GATACAGTGG TCATTACACT TAAGAACATG 480 GCTTCCCATC CTGTCAGTCT TCATGCTGTT GGTGTATCCT ACTGGAAAGC TTCTGAGGGA 540 GCTGAATATG ATGATCAGAC CAGTCAAAGG GAGAAAGAAG ATGATAAAGT CTTCCCTGGT 600 GGAAGCCATA CATATGTCTG GCAGGTCCTG AAAGAGAATG GTCCAATGGC CTCTGACCCA 660 CTGTGCCTTA CCTACTCATA TCTTTCTCAT GTGGACCTGG TAAAAGACTT GAATTCAGGC 720 CTCATTGGAG CCCTACTAGT ATGTAGAGAA GGGAGTCTGG CCAAGGAAAA GACACAGACC 780 TTGCACAAAT TTATACTACT TTTTGCTGTA TTTGATGAAG GGAAAAGTTG GCACTCAGAA 840 ACAAAGAACT CCTTGATGCA GGATAGGGAT GCTGCATCTG CTCGGGCCTG GCCTAAAATG 900 CACACAGTCA ATGGTTATGT AAACAGGTCT CTGCCAGGTC TGATTGGATG CCACAGGAAA 960 TCAGTCTATT GGCATGTGAT TGGAATGGGC ACCACTCCTG AAGTGCACTC AATATTCCTC 1020 GAAGGTCACA CATTTCTTGT GAGGAACCAT CGCCAGGCGT CCTTGGAAAT CTCGCCAATA 1080 ACTTTCCTTA CTGCTCAAAC ACTCTTGATG GACCTTGGAC AGTTTCTACT GTTTTGTCAT 1140 ATCTCTTCCC ACCAACATGA TGGCATGGAA GCTTATGTCA AAGTAGACAG CTGTCCAGAG 1200 GAACCCCAAC TACGAATGAA AAATAATGAA GAAGCGGAAG ACTATGATGA TGATCTTACT 1260 GATTCTGAAA TGGATGTGGT CAGGTTTGAT GATGACAACT CTCCTTCCTT TATCCAAATT 1320 CGCTCAGTTG CCAAGAAGCA TCCTAAAACT TGGGTACATT ACATTGCTGC TGAAGAGGAG 1380 GACTGGGACT ATGCTCCCTT AGTCCTCGCC CCCGATGACA GAAGTTATAA AAGTCAATAT 1440 TTGAACAATG GCCCTCAGCG GATTGGTAGG AAGTACAAAA AAGTCCGATT TATGGCATAC 1500 ACAGATGAAA CCTTTAAGAC TCGTGAAGCT ATTCAGCATG AATCAGGAAT CTTGGGACCT 1560 TTACTTTATG GGGAAGTTGG AGACACACTG TTGATTATAT TTAAGAATCA AGCAAGCAGA 1620 CCATATAACA TCTACCCTCA CGGAATCACT GATGTC.CGTC CTTTGTATTC AAGGAGATTA 1680 CCAAAAGGTG TAAAACATTT GAAGGATTTT CCAATTCTGC CAGGAGAAAT ATTCAAATAT 1740 AAATGGACAG TGACTGTAGA AGATGGGCCA ACTAAATCAG ATCCTCGGTG CCTGACCCGC 1800 TATTACTCTA GTTTCGTTAA TATGGAGAGA GATCTAGCTT CAGGACTCAT TGGCCCTCTC 1860 CTCATCTGCT ACAAAGAATC TGTAGATCAA AGAGGAAACC AGATAATGTC AGACAAGAGG 1920 AATGTCATCC TGTTTTCTGT ATTTGATGAG AACCGAAGCT GGTACCTCAC AGAGAATATA 1980 CAACGCTTTC TCCCCAATCC AGCTGGAGTG CAGCTTGAGG ATCCAGAGTT CCAAGCCTCC 2040 AACATCATGC ACAGCATCAA TGGCTATGTT TTTGATAGTT TGCAGTTGTC AGTTTGTTTG 2100 CATGAGGTGG CATACTGGTA CATTCTAAGC ATTGGAGCAC AGACTGACTT CCTTTCTGTC 2160 TTCTTCTCTG GATATACCTT CAAACACAAA ATGGTCTATG AAGACACACT CACCCTATTC 2220 CCATTCTCAG GAGAAACTGT CTTCATGTCG ATGGAAAACC CAGGTCTATG GATTCTGGGG 2280 TGCCACAACT CAGACTTTCG GAACAGAGGC ATGACCGCCT TACTGAAGGT TTCTAGTTGT 2340 GACAAGAACA CTGGTGATTA TTACGAGGAC AGTTATGAAG ATATTTCAGC ATACTTGCTG 2400 AGTAAAAACA ATGCCATTGA ACCAAGAAGC TTCTCCCAGA ATTCAAGACA CCCTAGCACT 2460 AGGCAAAAGC AATTTAATGC CACCACAATT CCAGAAAATG ACATAGAGAA GACTGACCCT 2520 TGGTTTGCAC ACAGAACACC TATGCCTAAA ATACAAAATG TCTCCTCTAG TGATTTGTTG 2580 ATGCTCTTGC GACAGAGTCC TACTCCACAT GGGCTATCCT TATCTGATCT CCAAGAAGCC 2640 AAATATGAGA CTTTTTCTGA TGATCCATCA CCTGGAGCAA TAGACAGTAA TAACAGCCTG 2700 TCTGAAATGA CACACTTCAG GCCACAGCTC CATCACAGTG GGGACATGGT ATTTACCCCT 2760 GAGTCAGGCC TCCAATTAAG ATTAAATGAG AAACTGGGGA CAACTGCAGC AACAGAGTTG 2820 AAGAAACTTG ATTTCAAAGT TTCTAGTACA TCAAATAATC TGATTTCAAC AATTCCATCA 2880 GACAATTTGG CAGCAGGTAC TGATAATACA AGTTCCTTAG GACCCCCAAG TATGCCAGTT 2940 CATTATGATA GTCAATTAGA TACCACTCTA TTTGGCAAAA AGTCATCTCC CCTTACTGAG 3000 TCTGGTGGAC CTCTGAGCTT GAGTGAAGAA AATAATGATT CAAAGTTGTT AGAATCAGGT 3060 TTAATGAATA GCCAAGAAAG TTCATGGGGA AAAAATGTAT CGTCAACAGA GAGTGGTAGG 3120 TTATTTAAAG GGAAAAGAGC TCATGGACCT GCTTTGTTGA CTAAAGATAA TGCCTTATTC 3180 AAAGTTAGCA TCTCTTTGTT AAAGACAAAC AAAACTTCCA ATAATTCAGC AACTAATAGA 3240 AAGACTCACA TTGATGGCCC ATCATTATTA ATTGAGAATA GTCCATCAGT CTGGCAAAAT 3300 ATATTAGAAA GTGACACTGA GTTTAAAAAA GTGACACCTT TGATTCATGA CAGAATGCTT 3360 ATGGACAAAA ATGCTACAGC TTTGAGGCTA AATCATATGT CAAATAAAAC TACTTCATCA 3420 AAAAACATGG AAATGGTCCA ACAGAAAAAA GAGGGCCCCA TTCCACCAGA TGCACAAAAT 3480 CCAGATATGT CGTTCTTTAA GATGCTATTC TTGCCAGAAT CAGCAAGGTG GATACAAAGG 3540 ACTCATGGAA AGAACTCTCT GAACTCTGGG CAAGGCCCCA GTCCAAAGCA ATTAGTATCC 3600 TTAGGACCAG AAAAATCTGT GGAAGGTCAG AATTTCTTGT CTGAGAAAAA CAAAGTGGTA 3660 GTAGGAAAGG GTGAATTTAC AAAGGACGTA GGACTCAAAG AGATGGTTTT TCCAAGCAGC 3720 AGAAACCTAT TTCTTACTAA CTTGGATAAT TTACATGAAA ATAATACACA CAATCAAGAA 3780 AAAAAAATTC AGGAAGAAAT AGAAAAGAAG GAAACATTAA TCCAAGAGAA TGTAGTTTTG 3840 CCTCAGATAC ATACAGTGAC TGGCACTAAG AATTTCATGA AGAACCTTTT CTTACTGAGC 3900 ACTAGGCAAA ATGTAGAAGG TTCATATGAG GGGGCATATG CTCCAGTACT TCAAGATTTT 3960 AGGTCATTAA ATGATTCAAC AAATAGAACA AAGAAACACA CAGCTCATTT CTCAAAAAAA 4020 GGGGAGGAAG AAAACTTGGA AGGCTTGGGA AATCAAACCA AGCAAATTGT AGAGAAATAT 4080 GCATGCACCA CAAGGATATC TCCTAATACA AGCCAGCAGA ATTTTGTCAC GCAACGTAGT 4140 AAGAGAGCTT TGAAACAATT CAGACTCCCA CTAGAAGAAA CAGAACTTGA AAAAAGGATA 4200 ATTGTGGATG ACACCTCAAC CCAGTGGTCC AAAAACATGA AACATTTGAC CCCGAGCACC 4260 CTCACACAGA TAGACTACAA TGAGAAGGAG AAAGGGGCCA TTACTCAGTC TCCCTTATCA 4320 GATTGCCTTA CGAGGAGTCA TAGCATCCCT CAAGCAAATA GATCTCCATT ACCCATTGCA 4380 AAGGTATCAT CATTTCCATC TATTAGACCT ATATATCTGA CCAGGGTCCT ATTCCAAGAC 4440 AACTCTTCTC ATCTTCCAGC AGCATCTTAT AGAAAGAAAG ATTCTGGGGT CCAAGAAAGC 4500 AGTCATTTCT TACAAGGAGC CAAAAAAAAT AACCTTTCTT TAGCCATTCT AACCTTGGAG 4560 ATGACTGGTG ATCAAAGAGA GGTTGGCTCC CTGGGGACAA GTGCCACAAA TTCAGTCACA 4620 TACAAGAAAG TTGAGAACAC TGTTCTCCCG AAACCAGACT TGCCCAAAAC ATCTGGCAAA 4680 GTTGAATTGC TTCCAAAAGT TCACATTTAT CAGAAGGACC TATTCCCTAC GGAAACTAGC 4740 AATGGGTCTC CTGGCCATCT GGATCTCGTG GAAGGGAGCC TTCTTCAGGG AACAGAGGGA 4800 GCGATTAAGT GGAATGAAGC AAACAGACCT GGAAAAGTTC CCTTTCTGAG AGTAGCAACA 4860 GAAAGCTCTG CAAAGACTCC CTCCAAGCTA TTGGATCCTC TTGCTTGGGA TAACCACTAT 4920 GGTACTCAGA TACCAAAAGA AGAGTGGAAA TCCCAAGAGA AGTCACCAGA AAAAACAGCT 4980 TTTAAGAAAA AGGATACCAT TTTGTCCCTG AACGCTTGTG AAAGCAATCA TGCAATAGCA 5040 GCAATAAATG AGGGACAAAA TAAGCCCGAA ATAGAAGTCA CCTGGGCAAA GCAAGGTAGG 5100 ACTGAAAGGC TGTGCTCTCA AAACCCACCA GTCTTGAAAC GCCATCAACG GGAAATAACT 5160 CGTACTACTC TTCAGTCAGA TCAAGAGGAA ATTGACTATG ATGATACCAT ATCAGTTGAA 5220 ATGAAGAAGG AAGATTTTGA CATTTATGAT GAGGATGAAA ATCAGAGCCC CCGCAGCTTT 5280 CAAAAGAAAA CACGACACTA TTTTATTGCT GCAGTGGAGA GGCTCTGGGA TTATGGGATG 5340 AGTAGCTCCC CACATGTTCT AAGAAACAGG GCTCAGAGTG GCAGTGTCCC TCAGTTCAAG 5400 AAAGTTGTTT TCCAGGAATT TACTGATGGC TCCTTTACTC AGCCCTTATA CCGTGGAGAA 5460 CTAAATGAAC ATTTGGGACT CCTGGGGCCA TATATAAGAG CAGAAGTTGA AGATAATATC 5520 ATGGTAACTT TCAGAAATCA GGCCTCTCGT CCCTATTCCT TCTATTCTAG CCTTATTTCT 5580 TATGAGGAAG ATCAGAGGCA AGGAGCAGAA CCTAGAAAAA ACTTTGTCAA GCCTAATGAA 5640 ACCAAAACTT ACTTTTGGAA AGTGCAACAT CATATGGCAC CCACTAAAGA TGAGTTTGAC 5700 TGCAAAGCCT GGGCTTATTT CTCTGATGTT GACCTGGAAA AAGATGTGCA CTCAGGCCTG 5760 ATTGGACCCC TTCTGGTCTG CCACACTAAC ACACTGAACC CTGCTCATGG GAGACAAGTG 5820 ACAGTACAGG AATTTGCTCT GTTTTTCACC ATCTTTGATG AGACCAAAAG CTGGTACTTC 5880 ACTGAAAATA TGGAAAGAAA CTGCAGGGCT CCCTGCAATA TCCAGATGGA AGATCCCACT 5940 TTTAAAGAGA ATTATCGCTT CCATGCAATC AATGGCTACA TAATGGATAC ACTACCTGGC 6000 TTAGTAATGG CTCAGGATCA AAGGATTCGA TGGTATCTGC TCAGCATGGG CAGCAATGAA 6060 AACATCCATT CTATTCATTT CAGTGGACAT GTGTTCACTG TACGAAAAAA AGAGGAGTAT 6120 AAAATGGCAC TGTACAATCT CTATCCAGGT GTTTTTGAGA CAGTGGAAAT GTTACCATCC 6180 AAAGCTGGAA TTTGGCGGGT GGAATGCCTT ATTGGCGAGC ATCTACATGC TGGGATGAGC 6240 ACACTTTTTC TGGTGTACAG CAATAAGTGT CAGACTCCCC TGGGAATGGC TTCTGGACAC 6300 ATTAGAGATT TTCAGATTAC AGCTTCAGGA CAATATGGAC AGTGGGCCCC AAAGCTGGCC 6360 AGACTTCATT ATTCCGGATC AATCAATGCC TGGAGCACCA AGGAGCCCTT TTCTTGGATC 6420 AAGGTGGATC TGTTGGCACC AATGATTATT CACGGCATCA AGACCCAGGG TGCCCGTCAG 6480 AAGTTCTCCA GCCTCTACAT CTCTCAGTTT ATCATCATGT ATAGTCTTGA TGGGAAGAAG 6540 TGGCAGACTT ATCGAGGAAA TTCCACTGGA ACCTTAATGG TCTTCTTTGG CAATGTGGAT 6600 TCATCTGGGA TAAAACACAA TATTTTTAAC CCTCCAATTA TTGCTCGATA CATCCGTTTG 6660 CACCCAACTC ATTATAGCAT TCGCAGCACT CTTCGCATGG AGTTGATGGG CTGTGATTTA 6720 AATAGTTGCA GCATGCCATT GGGAATGGAG AGTAAAGCAA TATCAGATGC ACAGATTACT 6780 GCTTCATCCT ACTTTACCAA TATGTTTGCC ACCTGGTCTC CTTCAAAAGC TCGACTTCAC 6840 CTCCAAGGGA GGAGTAATGC CTGGAGACCT CAGGTGAATA ATCCAAAAGA GTGGCTGCAA 6900 GTGGACTTCC AGAAGACAAT GAAAGTCACA GGAGTAACTA CTCAGGGAGT AAAATCTCTG 6960 CTTACCAGCA TGTATGTGAA GGAGTTCCTC ATCTCCAGCA GTCAAGATGG CCATCAGTGG 7020 ACTCTCTTTT TTCAGAATGG CAAAGTAAAG GTTTTTCAGG GAAATCAAGA CTCCTTCACA 7080 CCTGTGGTGA ACTCTCTAGA CCCACCGTTA CTGACTCGCT ACCTTCGAAT TCACCCCCAG 7140 AGTTGGGTGC ACCAGATTGC CCTGAGGATG GAGGTTCTGG GCTGCGAGGC ACAGGACCTC 7200 TACTGAGGGT GGCCACTGCA GCACCTGCCA CTGCCGTCAC CTCTCCCTCC TCAGCTCCAG 7260 GGCAGTGTCC CTCCCTGGCT TGCCTTCTAC CTTTGTGCTA AATCCTAGCA GACACTGCCT 7320 TGAAGCCTCC TGAATTAACT ATCATCAGTC CTGCATTTCT TTGGTGGGGG GCCAGGAGGG 7380 TGCATCCAAT TTAACTTAAC TCTTACCTAT TTTCTGCAGC TGCTCCCAGA TTACTCCTTC 7440 CTTCCAATAT AACTAGGCAA AAAGAAGTGA GGAGAAACCT GCATGAAAGC ATTCTTCCCT 7500 GAAAAGTTAG GCCTCTCAGA GTCACCACTT CCTCTGTTGT AGAAAAACTA TGTGATGAAA 7560 CTTTGAAAAA GATATTTATG ATGTTAACAT TTCAGGTTAA GCCTCATACG TTTAAAATAA 7620 AACTCTCAGT TGTTTATTAT CCTGATCAAG CATGGAACAA AGCATGTTTC AGGATCAGAT 7680 CAATACAATC TTGGAGTCAA AAGGCAAATC ATTTGGACAA TCTGCAAAAT GGAGAGAATA 7740 CAATAACTAC TACAGTAAAG TCTGTTTCTG CTTCCTTACA CATAGATATA ATTATGTTAT 7800 TTAGTCATTA TGAGGGGCAC ATTCTTATCT CCAAAACTAG CATTCTTAAA CTGAGAATTA 7860 TAGATGGGGT TCAAGAATCC CTAAGTCCCC TGAAATTATA TAAGGCATTC TGTATAAATG 7920 CAAATGTGCA TTTTTCTGAC GAGTGTCCAT AGATATAAAG CCATTGGTCT TAATTCTGAC 7980 CAATAAAAAA ATAAGTCAGG AGGATGCAAT TGTTGAAAGC TTTGAAATAA AATAACATGT 8040 CTTCTTGAAA TTTGTGATGG CCAAGAAAGA AAATGATGAT GACATTAGGC TTCTAAAGGA 8100 CATACATTTA ATATTTCTGT GGAAATATGA GGAAAATCCA TGGTTATCTG AGATAGGAGA 8160 TACAAACTTT GTAATTCTAA TAATGCACTC AGTTTACTCT CTCCCTCTAC TAATTTCCTG 8220 CTGAAAATAA CACAACAAAA ATGTAACAGG GGAAATTATA TACCGTGACT GAAAACTAGA 8280 GTCCTACTTA CATAGTTGAA ATATCAAGGA GGTCAGAAGA AAATTGGACT GGTGAAAACA 8340 GAAAAAACAC TCCAGTCTGC CATATCACCA CACAATAGGA TCCCCCTTCT TGCCCTCCAC 8400 CCCCATAAGA TTGTGAAGGG TTTACTGCTC CTTCCATCTG CCTGCACCCC TTCACTATGA 8460 CTACACAGAA CTCTCCTGAT AGTAAAGGGG GCTGGAGGCA AGGATAAGTT ATAGAGCAGT 8520 TGGAGGAAGC ATCCAAAGAC TGCAACCCAG GGCAAATGGA AAACAGGAGA TCCTAATATG 8580 AAAGAAAAAT GGATCCCAAT CTGAGAAAAG GCAAAAGAAT GGCTACTTTT TTCTATGCTG 8640 GAGTATTTTC TAATAATCCT GCTTGACCCT TATCTGACCT CTTTGGAAAC TATAACATAG 8700 CTGTCACAGT ATAGTCACAA TCCACAAATG ATGCAGGTGC AAATGGTTTA TAGCCCTGTG 8760 AAGTTCTTAA AGTTTAGAGG CTAACTTACA GAAATGAATA AGTTGTTTTG TTTTATAGCC 8820 CGGTAGAGGA GTTAACCCCA AAGGTGATAT GGTTTTATTT CCTGTTATGT TTAACTTGAT 8880 AATCTTATTT TGGCATTCTT TTCCCATTGA CTATATACAT CTCTATTTCT CAAATGTTCA 8940 TGGAACTAGC TCTTTTATTT TCCTGCTGGT TTCTTCAGTA ATGAGTTAAA TAAAACATTG 9000 ACACATACA 9009 (2) INFORMATION FOR SEQ ID NO:4: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 2332 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (v) FRAGMENT TYPE: N-terminal (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo sapien (F) TISSUE TYPE: Liver cDNA sequence (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4: Ala Thr Arg Arg Tyr Tyr Leu Gly Ala Val Glu Leu Ser Trp Asp Tyr 1 5 10 15 Met Gin Ser Asp Leu Gly Glu Leu Pro Val Asp Ala Arg Phe Pro Pro 20 25 30 Arg Val Pro Lys Ser Phe Pro Phe Asn Thr Ser Val Val Tyr Lys Lys 35 40 45 Thr Leu Phe Val Glu Phe Thr Val His Leu Phe Asn He Ala Lys Pro 50 55 60 Arg Pro Pro Trp Met Gly Leu Leu Gly Pro Thr He Gin Ala Glu Val 65 70 75 80 Tyr Asp Thr Val Val He Thr Leu Lys Asn Met Ala Ser His Pro Val 85 90 95 Ser Leu His Ala Val Gly Val Ser Tyr Trp Lys Ala Ser Glu Gly Ala 100 105 110 Glu Tyr Asp Asp Gin Thr Ser Gin Arg Glu Lys Glu Asp Asp Lys Val 115 120 125 Phe Pro Gly Gly Ser His Thr Tyr Val Trp Gin Val Leu Lys Glu Asn 130 135 140 Gly Pro Met Ala Ser Asp Pro Leu Cys Leu Thr Tyr Ser Tyr Leu Ser 145 150 155 160 His Val Asp Leu Val Lys Asp Leu Asn Ser Gly Leu He Gly Ala Leu 165 170 175 Leu Val Cys Arg Glu Gly Ser Leu Ala Lys Glu Lys Thr Gin Thr Leu 180 185 190 His Lys Phe He Leu Leu Phe Ala Val Phe Asp Glu Gly Lys Ser Trp 195 200 205 His Ser Glu Thr Lys Asn Ser Leu Met Gin Asp Arg Asp Ala Ala Ser Ala Arg Ala Trp Pro Lys Met His Thr Val Asn Gly Tyr Val Asn Arg 225 230 235 240 Ser Leu Pro Gly Leu He Gly Cys His Arg Lys Ser Val Tyr Trp His 245 250 255 Val He Gly Met Gly Thr Thr Pro Glu Val His Ser He Phe Leu Glu 260 265 270 Gly His Thr Phe Leu Val Arg Asn His Arg Gin Ala Ser Leu Glu He 275 280 285 Ser Pro He Thr Phe Leu Thr Ala Gin Thr Leu Leu Met Asp Leu Gly 290 295 300 Gin Phe Leu Leu Phe Cys His He Ser Ser His Gin His Asp Gly Met 305 310 315 320 Glu Ala Tyr Val Lys Val Asp Ser Cys Pro Glu Glu Pro Gin Leu Arg 325 330 335 Met Lys Asn Asn Glu Glu Ala Glu Asp Tyr Asp Asp Asp Leu Thr Asp 340 345 350 Ser Glu Met Asp Val Val Arg Phe Asp Asp Asp Asn Ser Pro Ser Phe 355 360 365 He Gin He Arg Ser Val Ala Lys Lys His Pro Lys Thr Trp Val His 370 375 380 Ser Val Phe Asp Glu Asn Arg Ser Trp Tyr Leu Thr Glu Asn He Gin 580 585 590 Arg Phe Leu Pro Asn Pro Ala Gly Val Gin Leu Glu Asp Pro Glu Phe 595 600 605 Gln Ala Ser Asn He Met His Ser He Asn Gly Tyr Val Phe Asp Ser 610 615 620 Leu Gin Leu Ser Val Cys Leu His Glu Val Ala Tyr Trp Tyr He Leu 625 630 635 640 Ser He Gly Ala Gin Thr Asp Phe Leu Ser Val Phe Phe Ser Gly Tyr 645 650 655 Thr Phe Lys His Lys Met Val Tyr Glu Asp Thr Leu Thr Leu Phe Pro 660 665 670 Phe Ser Gly Glu Thr Val Phe Met Ser Met Glu Asn Pro Gly Leu Trp 675 680 685 He Leu Gly Cys His Asn Ser Asp Phe Arg Asn Arg Gly Met Thr Ala 690 695 700 Leu Leu Lys Val Ser Ser Cys Asp Lys Asn Thr Gly Asp Tyr Tyr Glu 705 710 715 720 Asp Ser Tyr Glu Asp He Ser Ala Tyr Leu Leu Ser Lys Asn Asn Ala 725 730 735 He Glu Pro Arg Ser Phe Ser Gin Asn Ser Arg His Pro Ser Thr Arg 740 745 750 Gin Lys Gin Phe Asn Ala Thr Thr He Pro Glu Asn Asp He Glu Lys 755 760 765 Gly Lys Asn Val Ser Ser Thr Glu Ser Gly Arg Leu Phe Lys Gly Lys 965 970 975 Arg Ala His Gly Pro Ala Leu Leu Thr Lys Asp Asn Ala Leu Phe Lys 980 985 990 Val Ser He Ser Leu Leu Lys Thr Asn Lys Thr Ser Asn Asn Ser Ala 995 1000 1005 Thr Asn Arg Lys Thr His He Asp Gly Pro Ser Leu Leu He Glu Asn 1010 1015 1020 Ser Pro Ser Val Trp Gin Asn He Leu Glu Ser Asp Thr Glu Phe Lys 1025 1030 1035 1040 Lys Val Thr Pro Leu He His Asp Arg Met Leu Met Asp Lys Asn Ala 1045 1050 1055 Thr Ala Leu Arg Leu Asn His Met Ser Asn Lys Thr Thr Ser Ser Lys 1060 1065 1070 Asn Met Glu Met Val Gin Gin Lys Lys Glu Gly Pro He Pro Pro Asp 1075 1080 1085 Ala Gin Asn Pro Asp Met Ser Phe Phe Lys Met Leu Phe Leu Pro Glu 1090 1095 1100 Ser Ala Arg Trp He Gin Arg Thr His Gly Lys Asn Ser Leu Asn Ser 1105 1110 1115 1120 Gly Gin Gly Pro Ser Pro Lys Gin Leu Val Ser Leu Gly Pro Glu Lys 1125 1130 1135 Ser Val Glu Gly Gin Asn Phe Leu Ser Glu Lys Asn Lys Val Val Val 1140 1145 1150 Gly Lys Gly Glu Phe Thr Lys Asp Val Gly Leu Lys Glu Met Val Phe Pro Asn Asn Thr His Asn Gin Glu Lys Lys He Gin Glu Glu He Glu Lys 1185 1190 1195 1200 Lys Glu Thr Leu He Gin Glu Asn Val Val Leu Pro Gin He His Thr 1205 1210 1215 Val Thr Gly Thr Lys Asn Phe Met Lys Asn Leu Phe Leu Leu Ser Thr 1220 1225 1230 Arg Gin Asn Val Glu Gly Ser Tyr Glu Gly Ala Tyr Ala Pro Val Leu 1235 1240 1245 Gin Asp Phe Arg Ser Leu Asn Asp Ser Thr Asn Arg Thr Lys Lys His 1250 1255 1260 Thr Ala His Phe Ser Lys Lys Gly Glu Glu Glu Asn Leu Glu Gly Leu 1265 1270 1275 1280 Gly Asn Gin Thr Lys Gin He Val Glu Lys Tyr Ala Cys Thr Thr Arg 1285 1290 1295 He Ser Pro Asn Thr Ser Gin Gin Asn Phe Val Thr Gin Arg Ser Lys 1300 1305 1310 Arg Ala Leu Lys Gin Phe Arg Leu Pro Leu Glu Glu Thr Glu Leu Glu 1315 1320 1325 Lys Arg He He Val Asp Asp Thr Ser Thr Gin Trp Ser Lys Asn Met 1330 1335 1340 Lys His Leu Thr Pro Ser Thr Leu Thr Gin He Asp Tyr Asn Glu Lys 1345 1350 1355 1360 Glu Lys Gly Ala He Thr Gin Ser Pro Leu Ser Asp Cys Leu Thr Arg 1365 1370 1375 Ser His Ser He Pro Gin Ala Asn Arg Ser Pro Leu Pro He Ala Lys 1380 1385 1390 Val Ser Ser Phe Pro Ser He Arg Pro He Tyr Leu Thr Arg Val Leu 1395 1400 1405 Phe Gin Asp Asn Ser Ser His Leu Pro Ala Ala Ser Tyr Arg Lys Lys 1410 1415 1420 Asp Ser Gly Val Gin Glu Ser Ser His Phe Leu Gin Gly Ala Lys Lys 1425 1430 1435 t 1440 Asn Asn Leu Ser Leu Ala He Leu Thr Leu Glu Met Thr Gly Asp Gin 1445 1450 1455 Arg Glu Val Gly Ser Leu Gly Thr Ser Ala Thr Asn Ser Val Thr Tyr 1460 1465 1470 Lys Lys Val Glu Asn Thr Val Leu Pro Lys Pro Asp Leu Pro Lys Thr 1475 1480 1485 Ser Gly Lys Val Glu Leu Leu Pro Lys Val His He Tyr Gin Lys Asp 1490 1495 1500 Leu Phe Pro Thr Glu Thr Ser Asn Gly Ser Pro Gly His Leu Asp Leu 1505 1510 1515 1520 Val Glu Gly Ser Leu Leu Gin Gly Thr Glu Gly Ala He Lys Trp Asn 1525 1530 1535 Glu Ala Asn Arg Pro Gly Lys Val Pro Phe Leu Arg Val Ala Thr Glu 1540 1545 1550 Ser Ser Ala Lys Thr Pro Ser Lys Leu Leu Asp Pro Leu Ala Trp Asp 1555 1560 1565 Asn His Tyr Gly Thr Gin He Pro Lys Glu Glu Trp Lys Ser Gin Glu 1570 1575 1580 Lys Ser Pro Glu Lys Thr Ala Phe Lys Lys Lys Asp Thr He Leu Ser 1585 1590 1595 1600 Leu Asn Ala Cys Glu Ser Asn His Ala He Ala Ala He Asn Glu Gly 1605 1610 1615 Gin Asn Lys Pro Glu He Glu Val Thr Trp Ala Lys Gin Gly Arg Thr 1620 1625 1630 Glu Arg Leu Cys Ser Gin Asn Pro Pro Val Leu Lys Arg His Gin Arg 1635 1640 1645 Glu He Thr Arg Thr Thr Leu Gin Ser Asp Gin Glu Glu He Asp Tyr 1650 1655 1660 Asp Asp Thr He Ser Val Glu Met Lys Lys Glu Asp Phe Asp He Tyr 1665 1670 1675 1680 Asp Glu Asp Glu Asn Gin Ser Pro Arg Ser Phe Gin Lys Lys Thr Arg 1685 1690 1695 His Tyr Phe He Ala Ala Val Glu Arg Leu Trp Asp Tyr Gly Met Ser 1700 1705 1710 Ser Ser Pro His Val Leu Arg Asn Arg Ala Gin Ser Gly Ser Val Pro 1715 1720 1725 Gin Phe Lys Lys Val Val Phe Gin Glu Phe Thr Asp Gly Ser Phe Thr 1730 1735 1740 Gln Pro Leu Tyr Arg Gly Glu Leu Asn Glu His Leu Gly Leu Leu Gly " 1745 1750 1755 1760 Pro Tyr He Arg Ala Glu Val Glu Asp Asn He Met Val Thr Phe Arg 1765 1770 1775 Asn Gin Ala Ser Arg Pro Tyr Ser Phe Tyr Ser Ser Leu He Ser Tyr 1780 1785 1790 Glu Glu Asp Gin Arg Gin Gly Ala Glu Pro Arg Lys Asn Phe Val Lys 1795 1800 1805 Pro Asn Glu Thr Lys Thr Tyr Phe Trp Lys Val Gin His His Met Ala 1810 1815 1820 Pro Thr Lys Asp Glu Phe Asp Cys Lys Ala Trp Ala Tyr Phe Ser Asp 1825 1830 1835 1840 Val Asp Leu Glu Lys Asp Val His Ser Gly Leu He Gly Pro Leu Leu 1845 1850 1855 Val Cys His Thr Asn Thr Leu Asn Pro Ala His Gly Arg Gin Val Thr 1860 1865 1870 Val Gin Glu Phe Ala Leu Phe Phe Thr He Phe Asp Glu Thr Lys Ser 1875 1880 1885 Trp Tyr Phe Thr Glu Asn Met Glu Arg Asn Cys Arg Ala Pro Cys Asn 1890 1895 1900 He Gin Met Glu Asp Pro Thr Phe Lys Glu Asn Tyr Arg Phe His Ala 1905 1910 1915 1920 He Asn Gly Tyr He Met Asp Thr Leu Pro Gly Leu Val Met Ala Gin 1925 1930 1935 Asp Gin Arg He Arg Trp Tyr Leu Leu Ser Met Gly Ser Asn Glu Asn He His Ser He His Phe Ser Gly His Val Phe Thr Val Arg Lys Lys 1955 1960 1965 Glu Glu Tyr Lys Met Ala Leu Tyr Asn Leu Tyr Pro Gly Val Phe Glu 1970 1975 1980 Thr Val Glu Met Leu Pro Ser Lys Ala Gly He Trp Arg Val Glu Cys 1985 1990 1995 2000 Leu He Gly Glu His Leu His Ala Gly Met Ser Thr Leu Phe Leu Val 2005 2010 2015 Tyr Ser Asn Lys Cys Gin Thr Pro Leu Gly Met Ala Ser Gly His He 2020 2025 2030 Arg Asp Phe Gin He Thr Ala Ser Gly Gin Tyr Gly Gin Trp Ala Pro 2035 2040 2045 Lys Leu Ala Arg Leu His Tyr Ser Gly Ser He Asn Ala Trp Ser Thr 2050 2055 2060 Lys Glu Pro Phe Ser Trp He Lys Val Asp Leu Leu Ala Pro Met He 2065 2070 2075 2080 He His Gly He Lys Thr Gin Gly Ala Arg Gin Lys Phe Ser Ser Leu 2085 2090 2095 Tyr He Ser Gin Phe He He Met Tyr Ser Leu Asp Gly Lys Lys Trp 2100 2105 2110 • Gin Thr Tyr Arg Gly Asn Ser Thr Gly Thr Leu Met Val Phe Phe Gly 2115 2120 2125 Asn Val Asp Ser Ser Gly He Lys His Asn He Phe Asn Pro Pro He 2130 2135 2140 Ile Ala Arg Tyr He Arg Leu His Pro Thr His Tyr Ser He Arg Ser 2145 2150 2155 2160 Thr Leu Arg Met Glu Leu Met Gly Cys Asp Leu Asn Ser Cys Ser Met 2165 2170 2175 Pro Leu Gly Met Glu Ser Lys Ala He Ser Asp Ala Gin He Thr Ala 2180 2185 2190 Ser Ser Tyr Phe Thr Asn Met Phe Ala Thr Trp Ser Pro Ser Lys Ala 2195 2200 2205 Arg Leu His Leu Gin Gly Arg Ser Asn Ala Trp Arg Pro Gin Val Asn 2210 2215 2220 Asn Pro Lys Glu Trp Leu Gin Val Asp Phe Gin Lys Thr Met Lys Val 2225 2230 2235 2240 Thr Gly Val Thr Thr Gin Gly Val Lys Ser Leu Leu Thr Ser Met Tyr 2245 2250 2255 Val Lys Glu Phe Leu He Ser Ser Ser Gin Asp Gly His Gin Trp Thr 2260 2265 2270 Leu Phe Phe Gin Asn Gly Lys Val Lys Val Phe Gin Gly Asn Gin Asp Ser Phe Thr Pro Val Val Asn Ser Leu Asp Pro Pro Leu Leu Thr Arg 2290 2295 2300 Tyr Leu Arg He His Pro Gin Ser Trp Val His Gin He Ala Leu Arg 2305 2310 2315 2320 Met Glu Val Leu (2) INFORMATION FOR SEQ ID NO:5: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1260 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (Vi) ORIGINAL SOURCE: (A) ORGANISM: Porcine ( i) SEQUENCE DESCRIPTION: SEQ ID NO:5: GAATTCTTCA CTCAGATTCT CCTGTTCACA GTAGAAATTC AGTATTGTTA GCACTCTTTT 60 AGTTACCTGT ATCCTAAACC TAAGTCCTGC TCCCTTATAC TTACTCATCC TACAAATTGG 120 TCAGAGTATG TGTTTGGCAT TATGTTATGT GATTTGAATG CATTATCAGA TACTACTAGT 180 CTCATTTACA AATTAGAAAA CTGGAGCTCA GAGAGTTCCT TGGACTTGCT TAAAGCAACA 240 CAGCTGGTAA ATTGTATAGC TAGGATTCGA ACCGAGGCAA TCGTACTCTA GAACCCATGC 300 CACTATGTTG CATAGCATAA TAGCCCGCCT ATATAAACTT GGCTGAATTA AGTCACGATC 360 TATCATCACC AAAGAGTCCG TGTGACTAAG AGTCTCAACT ATTGTATGTC AATTATATTT 420 CTCCATTTTT ATCCCAATAT ATATTCATTT AAATCACAGC CCTTTCTTGT GGTCACAAAC 480 AGGTACACTA GAGCCATGGT TGGGCTGCAG TCCATGGTGT ACATTTAACC CAACGACCTC 540 GATATAATGG TACCGACTAG TGTTTTGTTT TTGTTTTTGT TTCATTTTTC TGGGAATAGA 600 AGAGAACCTC TAACACAGAT CTTGCTTGGG ACCTGGGCTG TGAGTAACCA GAGTTTTATT 660 CTTCCTTATC TCCAGGTCTC TGGGTCCTAG GGTGCCACAA CTCAGACTTG CGGAACAGAG 720 GGATGACAGC CTTACTGAAG GTGTATAGTT GTGACAGGGA CACTGGTGAT TATTATGACA 780 ACACTTATGA AGATATTCCA GGCTTCTTGC TGAGTGGAAA GAATGTCATT GAACCCAGAA 840 GCTTTGCCCA GAATTCAAGA CCCCCTAGTG CGAGCCAAAA GCAATTCCAA ACCATCACAA 900 GTCCAGAAGA TGACGTGGAG CTTGACCCGC AGTCTGGAGA GAGAACCCAA GCACTGGAAG 960 AACTAAGTGT CCCCTCTGGT GATGGGTCGA TGCTCTTGGG ACAGAATCCT GCTCCACATG 1020 GCTCATCCTC ATCTGATCTT CAAGAAGCCA GGAATGAGGC TGATGATTAT TTACCTGGAG 1080 CAAGAGAAAG AAACACGGCC CCATCCGCAG CGGCACGTCT CAGACCAGAG CTGCATCACA 1140 GTGCCGAAAG AGTACTTACT CCTGAGCCAG AGAAAGAGTT GAAGAAACTT GATTCTTAAA 1200 TGTCTAGTTC ATCAGACCTT CTAAAGACTT CGCCAACAAT TCCATCAGAC ACGTTGTCAG 1260 (2) INFORMATION FOR SEQ ID NO:6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1090 amino acids (B) TYPE: amino acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (v) FRAGMENT TYPE: N-terminal (vi) ORIGINAL SOURCE: (A) ORGANISM: Porcine (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6: Gly Leu Trp Val Leu Gly Cys His Met Ser Asp Leu Arg Asn Arg Gly 1 5 10 15 Met Thr Ala Leu Leu Lys Val Tyr Ser Cys Asp Arg Asp Thr Gly Asp 20 25 30 Tyr Tyr Asp Asn Thr Tyr Glu Asp Leu Pro Gly Phe Leu Leu Ser Gly 35 40 45 Lys Asn Val He Glu Pro Arg Ser Phe Ala Gin Asn Ser Arg Pro Pro 50 55 60 Ser Ala Ser Gin Lys Gin Phe Gin Thr He Thr Ser Pro Glu Asp Asp 65 70 75 80 Val Glu Leu Xaa Glu Leu Ser Val Pro Ser Gly Asp Gly Ser Met Leu Leu Gly Gin Asn 100 105 110 Pro Ala Pro His Gly Ser Ser Ser Ser Asp Leu Gin Glu Ala Arg Asn 115 120 125 Glu Ala Xaa Xaa Asp Asp Tyr Leu Pro Gly Ala Arg Glu Arg Asn Thr 130 135 140 Ala Pro Ser Ala Ala Ala Arg Leu Arg Pro Glu Leu His His Ser Ala 145 150 155 160 Glu Arg Val Leu Thr Pro Glu Pro Glu Lys Xaa Xaa Xaa Xaa Xaa Xaa 165 170 175 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Glu Leu Lys Lys Leu Asp Ser Lys 180 185 190 Met Ser Ser Ser Ser Asp Leu Leu Lys Thr Ser Pro Thr He Pro Ser 195 200 205 Asp Thr Leu Ser Ala Glu Thr Glu Arg Thr His Ser Leu Gly Pro Pro 210 215 220 His Pro Gin Val Asn Phe Arg Ser Gin Leu Gly Ala He Val Leu Gly 225 230 235 240 Lys Asn Ser Ser His Phe He Gly Ala Gly Val Pro Leu Gly Ser Thr 245 250 255 Glu Phe Asp His Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 260 265 270 Xaa Glu Ser Ser Leu Gly Glu Asn Val Ser Pro Val Glu Ser Asp Gly 275 280 285 He Phe Glu Lys Glu Arg Ala His Gly Pro Ala Ser Leu Thr Lys Asp 290 295 300 Ala Asp Val Gin Gly Asn Asp Thr His Ser Gin Gly Lys Lys Ser Arg 500 505 510 Glu Glu Met Glu Arg Arg Glu Xaa Leu Val Gin Glu Lys Val Asp Leu 515 520 525 Pro Gin Val Tyr Thr Ala Thr Gly Thr Lys Asn Phe Leu Arg Asn He 530 535 540 Phe His Gin Ser Thr Glu Pro Ser Val Glu Gly Phe Asp Gly Gly Ser 545 550 555 560 His Ala Pro Val Pro Gin Asp Ser Arg Ser Leu Asn Asp Ser Ala Glu 565 570 575 Arg Ala Glu Thr His He Ala His Phe Ser Ala He Arg Glu Glu Ala 580 585 ' 590 Pro Leu Glu Ala Pro Gly Asn Phe Thr Gly Pro Gly Pro Arg Ser Ala 595 600 605 Val Pro Arg Arg Val Lys Gin Ser Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 610 615 620 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Leu Lys Gin He Arg Leu Pro Leu Glu 625 630 635 640 Glu He Lys Pro Glu Arg Gly Val Val Leu Asn Ala Thr Ser Thr Arg 645 650 655 Trp Ser Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 660 665 670 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 675 680 685 Pro Pro Met Pro Lys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Glu 885 890 895 Trp Glu Ser Asp He Leu Ser Leu Pro Leu Asp Arg His Glu Ser Asn His Ser He 915 920 925 Ala Ala Lys Asn Glu Gly Gin Ala Phe Thr Gin Arg Glu Ala Ala Trp 930 935 940 Thr Lys Gin Gly Gly Pro Gly Arg Leu Cys Ala Pro Lys Pro Pro Val 945 950 955 960 Leu Arg Arg His Gin Arg Asp He Ser Leu Pro Thr Pro Gin Pro Glu 965 970 975 Glu Asp Lys Met Asp Tyr Asp Asp He Phe Ser Thr Glu Thr Lys Gly 980 985 990 Glu Asp Phe Asp He Tyr Gly Glu Asp Glu Asn Gin Asp Pro Arg Ser 995 1000 1005 Phe Gin Lys Arg Thr Arg His Tyr Phe He Ala Ala Val Glu Gin Leu 1010 1015 1020 Trp Asp Tyr Gly Met Ser Glu Ser Pro Arg Ala Leu Arg Asn Arg Ala 1025 1030 1035 1040 Gin Asn Gly Glu Val Pro Arg Phe Lys Lys Val Val Phe Arg Glu Phe 1045 1050 1055 Ala Asp Gly Ser Phe Thr Asn Pro Ser Tyr Arg Gly Glu Leu Asn Lys 1060 1065 1070 His Leu Gly Leu Leu Gly Pro Tyr He Arg Ala Glu Val Glu Asp Asn 1075 1080 1085 He Met

Claims: We claim: 1. A purified procoagulant hybrid factor VIII molecule comprising porcine and human amino acid sequence. 2. The molecule of claim 1, wherein the protein is selected from the group consisting of a protein consisting essentially of a human light chain factor VIII subunit and a porcine heavy chain factor VIII subunit and a protein consisting essentially of a porcine light chain factor VIII subunit and a human heavy chain factor VIII subunit. 3. The molecule of claim 1 , wherein the protein is selected from the group consisting of a protein consisting essentially of a human factor VIII in which one or more porcine Al, A2, B, A3, Cl, or C2 domains is substituted for the homologous human factor VIII domains and a protein consisting essentially of a porcine factor VIII in which one or more human Al, A2, B, A3, Cl, or C2 domains is substituted for the homologous porcine factor VIII domains. 4. The molecule of claim 1, wherein the protein consists essentially of any porcine factor VIII in which one or more amino acids unique to human factor VIII have been substituted for the corresponding porcine amino acid(s) . 5. The molecule of claim 1, wherein the protein consists essentially of any human factor VIII in which one or more amino acids unique to porcine factor VIII have been substituted for the corresponding human amino acid(s) . 6. The molecule of claim 1, wherein the protein has a specific activity greater than 20,000 U/A 280 protein in aqueous solution when human plasma is used as the standard in a one-stage coagulation assay. 7. The molecule of claim 1, wherein the hybrid human/porcine factor VIII is useful in treating human patients with factor VIII deficiency. 8. The molecule of claim 7, wherein the hybrid human/porcine factor VIII is combined with a pharmaceutical carrier suitable for infusion in patients. 9. The molecule of claim 8, wherein the carrier is selected from the group consisting of stabilizing agents and delivery vehicles. 10. The molecule of claim 9, wherein the stabilizing agents are selected from the group consisting of proteins and polysaccharides. 11. The molecule of claim 8, further comprising clotting factors selected from the group consisting of von illebrand factor, vitamin K dependent clotting factors, and coagulant tissue factor. 12. The molecule of claim 9, wherein the delivery vehicles are liposomes. 13. A method for treating human patients with factor VIII deficiency comprising administering to the patient a hybrid human/porcine factor VIII molecule, wherein the clotting activity of the hybrid human/porcine factor VIII molecule is not inhibited by the antibodies to human factor VIII. 14. The method of claim 13, wherein the patients are characterized by the presence of antibodies to human factor VIII. 15. A method of preparing purified hybrid human/porcine coagulation factor VIII comprising combining primary amino acid sequence derived from porcine factor VIII with primary amino acid sequence derived from human factor VIII to form a procoagulant hybrid factor VIII molecule. 16. The method of claim 15, wherein the hybrid human/porcine factor VIII molecule is formed by isolating and purifying heavy and light chain subunits of human factor VIII and porcine factor VIII, then mixing the human and porcine subunits to form the hybrid human/porcine factor VIII. 17. The method of claim 16, wherein the human and porcine factor VIII subunits are isolated from human and porcine plasma. 18. The method of claim 15, wherein the hybrid human/porcine factor VIII is formed by expression of recombinant DNA encoding domains in the light chain and heavy chain subunits of porcine and human factor VIII, further comprising substituting domains of porcine and human factor VIII. 19. The method of claim 16, wherein the hybrid human/porcine factor VIII molecule is formed by mixing human light chain factor VIII subunits and porcine heavy chain factor VIII subunits. 20. The method of claim 16, wherein the hybrid human/porcine factor VIII molecule is formed by mixing porcine light chain factor VIII subunits and human heavy chain factor VIII subunits. 21. The method of claim 15, wherein the hybrid human/porcine factor VIII molecule is prepared by replacement of specific amino acid residues of human factor VIII with the homologous porcine factor VIII amino acid residues by site-directed mutagenesis of the encoding nucleic acid. 22. An isolated nucleic acid sequence encoding procoagulant hybrid human/porcine factor VIII molecule comprising porcine and human amino acid sequence. 23. The nucleic acid sequence of claim 22, wherein the protein consists essentially of a human light chain factor VIII subunit and a porcine heavy chain factor VIII subunit. 24. The nucleic acid sequence of claim 22, wherein the protein consists essentially of a porcine light chain factor VIII subunit and a human heavy chain factor VIII subunit. 25. The nucleic acid sequence of claim 22, wherein the protein has specific activity greater than 20,000 U/A 2g0 when human plasma is used as the standard in a one-stage coagulation assay. 26. The nucleic acid sequence of claim 22, encoding a protein useful in treating human factor VIII deficiency. 27. The nucleic acid sequence of claim 26, wherein the protein consists of any porcine factor VIII domain, including Al, A2, B, A3, Cl, or C2, that is substituted for the homologous human factor VIII domain. 28. The nucleic acid sequence of claim 26, wherein the protein is less reactive with factor VIII inhibitory antibodies. 29. An isolated nucleic acid sequence encoding porcine factor VIII A2 domain.

Inventors: LOLLAR JOHN S, RUNGE MARSCHALL S, LOLLAR, JOHN, S., RUNGE, MARSCHALL, S.
Applicants: UNIV EMORY, EMORY UNIVERSITY
Application year: 1993
Main classification: C07H21
IPC codes: A61K38, A61P7, C07H21, C07K14, C07K19, C12N5, C12N15, C12P21, C12R1