title: Purification and characterization of a thrombin like enzyme, elegaxobin II, with lys-bradykinin releasing activity from the venom of Trimeresurus elegans (Sakishima-Habu).
abstract: A thrombin like enzyme, named elegaxobin II, with Lys-bradykinin releasing activity was purified from the venom of Trimeresurus elegans (Sakishima-habu) by gel-filtration on Sephadex G-100, and ion-exchange chromatography on the Q-Sepharose Fast Flow. By this procedure, about 9mg of purified enzyme was obtained from 1.1g of the venom. The purified enzyme showed a single protein band, the molecular weight of which was estimated to be about 35,000Da by sodium dodecyl sulfate-PAGE) under reducing condition, and this enzyme was found to contain a carbohydrate moiety. The specific activity of this enzyme toward tosyl-L-arginine methyl ester (TAME) was 250 TAME units/mg of protein. This enzyme clotted only rabbit fibrinogen, whereas human and bovine fibrinogens were unaffected. In the fibrinogen-fibrin conversion, this enzyme released only fibrinopeptide A from rabbit fibrinogen, whereas it did not release fibrinopeptide B. Furthermore, elegaxobin II released Lys-bradykinin when the enzyme was incubated with bovine plasma. The esterase activity was inhibited by p-amidinophenylmethanesulfonyl fluoride hydrochloride (p-APMSF), suggesting that this enzyme is a serine protease. The N-terminal sequence (Val-Ile-Gly-Gly) of this enzyme was identical to the typical sequence of serine proteinases.
authors.affiliation: Department of Hygenic Chemistry, Meiji Pharmaceutical University, 2-522-1 Noshio Kiyose, Tokyo 204-8588, Japan.
authors.forename: Etsuko
authors.initials: E
authors.lastname: Oyama
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Takahashi
mesh_terms: D000818:Animals; D001920:Bradykinin / Q000737:chemistry; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D003435:Crotalid Venoms / Q000737:chemistry* / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005340:Fibrinogen / Q000187:drug effects; D006801:Humans; D011817:Rabbits; D012697:Serine Endopeptidases / Q000737:chemistry* / Q000494:pharmacology; D013379:Substrate Specificity; D017841:Trimeresurus
chemical_list: D003435:Crotalid Venoms; C029748:Trimeresurus venoms; D005340:Fibrinogen; D012697:Serine Endopeptidases; C408443:elegaxobin; D001920:Bradykinin