title: Characterization and preliminary crystallographic studies of EMS16, an antagonist of collagen receptor (GPIa/IIa) from the venom of Echis multisquamatus.
abstract: EMS16 is a member of the snake venom-derived C-type lectin family of proteins (CLPs) found in the venom of Echis multisquamatus. It binds to glycoprotein Ia/IIa (integrin alpha2beta1), a major collagen receptor of platelets, acting as a potent antagonist of platelet aggregation and cell migration. Amino acid sequencing and cDNA cloning of EMS16 have revealed that it is composed of an A chain of 134 amino acid residues and a B chain of 128 residues. Crystals of EMS16 belong to space group P2(1)2(1)2(1), with unit-cell parameters a = 46.57, b = 59.93, and c = 115.74 A, and diffract to a resolution of 1.9 A. Phase determination is underway by means of molecular replacement with the structure of blood coagulation factor IX-binding protein (IX-bp) from habu snake venom (PDB code 1bj3) as the search model.
authors.affiliation: Department of Biochemistry, Meiji Pharmaceutical University, 2-522-1, Noshio, Kiyose, Tokyo, 204-8588.
authors.forename: Daiju
authors.initials: D
authors.lastname: Okuda
authors.forename: Katsunori
authors.initials: K
authors.lastname: Horii
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mizuno
authors.forename: Takashi
authors.initials: T
authors.lastname: Morita
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D018076:DNA, Complementary / Q000235:genetics; D037181:Lectins, C-Type / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D009699:N-Glycosyl Hydrolases / Q000378:metabolism; D011487:Protein Conformation; D038981:Receptors, Collagen / Q000037:antagonists & inhibitors*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014757:Viper Venoms / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D017819:Viperidae
chemical_list: D018076:DNA, Complementary; C412704:EMS16 lectin, Echis multisquamtus; D037181:Lectins, C-Type; D038981:Receptors, Collagen; D014757:Viper Venoms; D009699:N-Glycosyl Hydrolases