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J. Biol. Chem., Vol. 266, Issue 23, 14903-14911, 08, 1991

The primary structure of coagulation factor IX/factor X-binding protein isolated from the venom of Trimeresurus flavoviridis. Homology with asialoglycoprotein receptors, proteoglycan core protein, tetranectin, and lymphocyte Fc epsilon receptor for immunoglobulin E

H Atoda, M Hyuga and T Morita
Department of Biochemistry, Meiji College of Pharmacy, Tokyo, Japan.

An anticoagulant protein, factor IX/factor X-binding protein (IX/X-bp), isolated from the venom of Trimeresurus flavoviridis, binds with factor IX and factor X in the presence of Ca2+ with a 1 to 1 stoichiometry (Atoda, H., and Morita, T. (1989) J. Biochem. (Tokyo) 106, 808-813). Analysis of S-pyridylethylated IX/X-bp by sodium dodecyl sulfate- polyacrylamide gel electrophoresis revealed a 16.0-kDa band (designated the A chain) and a 15.5-kDa band (designated the B chain). These two chains were separated by reversed-phase high performance liquid chromatography, and their complete amino acid sequences were determined by sequencing of the peptides obtained after digestion with lysyl endopeptidase, chymotrypsin, and V8 protease from Staphylococcus aureus and after chemical cleavage with cyanogen bromide. The A chain had an amino-terminal sequence of Asp-Cys-Leu-Ser-Gly- and consisted of 129 residues with Mr 14,830. The B chain has an amino-terminal sequence of Asp-Cys-Pro-Ser-Asp- and consists of 123 residues of Mr 14,440. There was 47% identity between the A and the B chain. The sequence of IX/X-bp showed 25-37% identity with that of the C-type carbohydrate recognition domain-like structure of acorn barnacle lectin, human and rat asialoglycoprotein receptors, the human lymphocyte Fc epsilon receptor for immunoglobulin E, proteoglycan core protein, pancreatic stone protein, and tetranectin. The sequences of the first 18 amino acid residues of both the A and B chains were also, to a certain extent, homologous to the partial amino acid sequence of the b subunit of factor XIII, a member of the beta 2-glycoprotein I-like family. In this region, some similarity with the amino-terminal amino acid sequence of botrocetin was also observed.
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