title: Purification and characterization of alpha-mucrofibrase, a novel serine protease with alpha-fibrinogenase activity from the venom of Chinese Habu (Trimeresurus mucrosquamatus).
abstract: A novel fibrinogenolytic protease, named alpha-mucrofibrase, was purified from the venom of Chinese Habu (Trimeresurus mucrosquamatus) by DEAE-Sephadex A-50 ion-exchange chromatography and Sephadex G-100 (super fine) gel filtration alpha-Mucrofibrase is a single-chain polypeptide of approximately 29 kDa. It is stable even at 95 degrees C, and the most susceptible hydrolysis substrate is S-2302. It cleaved primarily the Aalpha chain of fibrinogen followed by the Bbeta chain, while the gamma chain was partially affected. N-terminal sequence of this fibrinogenolytic enzyme has great homology with those of other snake venom serine proteases. The esterase activity of alpha-mucrofibrase is inhibited by phenylmethylsulfonyl fluoride (PMSF) but not by metal chelator (EDTA), suggesting this fibrinogenase belongs to the venom serine protease family.
authors.affiliation: Department of Animal Toxinology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Wei
authors.forename: Yang
authors.initials: Y
authors.lastname: Jin
authors.forename: Qui-Min
authors.initials: QM
authors.lastname: Lu
authors.forename: Ji-Fu
authors.initials: JF
authors.lastname: Wei
authors.forename: Wang-Yu
authors.initials: WY
authors.lastname: Wang
authors.forename: Yu-Liang
authors.initials: YL
authors.lastname: Xiong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D002852:Chromatography, Ion Exchange; D003435:Crotalid Venoms / Q000737:chemistry / Q000201:enzymology* / Q000302:isolation & purification* / Q000378:metabolism; D004795:Enzyme Stability; D005340:Fibrinogen / Q000378:metabolism; D006470:Hemorrhage / Q000139:chemically induced; D008666:Metalloendopeptidases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D010974:Platelet Aggregation / Q000187:drug effects; D011817:Rabbits; D017386:Sequence Homology, Amino Acid; D012697:Serine Endopeptidases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D015842:Serine Proteinase Inhibitors / Q000494:pharmacology; D013379:Substrate Specificity; D017841:Trimeresurus
chemical_list: D003435:Crotalid Venoms; D015842:Serine Proteinase Inhibitors; C029748:Trimeresurus venoms; D005340:Fibrinogen; D012697:Serine Endopeptidases; C473963:alpha-mucrofibrase, Trimeresurus mucrosquamatus; D008666:Metalloendopeptidases