BjSP, a novel serine protease from Bothrops jararaca snake venom that degrades fibrinogen without forming fibrin clots

Autor(es)

Carone, I, Sante E. ; Menaldo, Danilo L. ^[1] ; Sartim, Marco A. ^[1] ; Bernardes, Carolina P. ^[1] ; Caetano, Renato C. ^[1] ; da Silva, Ronivaldo R. ^{[2, 3]} ; Cabral, Hamilton ^[2] ; Barraviera, Benedito ^{[4, 5]} ; Ferreira Junior, Rui S. ^{[4, 5]} ; Sampaio, V, Suely

Afiliação do(s) autor(es)

^[1] Carone, Sante E., I, V, Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Anal Clin Toxicol & Bromatol, Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Ciencias Farmaceut, Ribeirao Preto, SP - Brazil

^[3] Univ Estadual Paulista UNESP, Inst Biociencias Letras & Ciencias Exatas, Sao Jose Do Rio Preto, SP - Brazil

^[4] Univ Estadual Paulista UNESP, CEVAP, Botucatu, SP - Brazil

^[5] Univ Estadual Paulista UNESP, Fac Med Botucatu, Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Toxicology and Applied Pharmacology; v. 357, p. 50-61, OCT 15 2018.
• Citações Web of Science: 2

Resumo

Snake venom serine proteases (SVSPs) are commonly described as capable of affecting hemostasis by interacting with several coagulation system components. In this study, we describe the isolation and characterization of BjSP from Bothrops jararaca snake venom, a serine protease with distinctive properties. This enzyme was isolated by three consecutive chromatographic steps and showed acidic character (pI 4.4), molecular mass of 28 kDa and N-carbohydrate content around 10%. Its partial amino acid sequence presented 100% identity to a serine protease cDNA clone previously identified from B. jararaca venom gland, but not yet isolated or characterized. BjSP was significantly inhibited by specific serine protease inhibitors and showed high stability at different pH values and temperatures. The enzyme displayed no effects on washed platelets, but was able to degrade fibrin clots in vitro and also the A alpha and B beta chains of fibrinogen differently from thrombin, forming additional fibrinopeptides derived from the B beta chain, which should be related to its inability to coagulate fibrinogen solutions or platelet-poor plasma. In the mapping of catalytic subsites, the protease showed high hydrolytic specificity for tyrosine, especially in subsite S1. Additionally, its amidolytic activity on different chromogenic substrates suggests possible effects on other factors of the coagulation cascade. In conclusion, BjSP is a serine protease that acts non-specifically on fibrinogen, generating different B beta fibrinopeptides and thus not forming fibrin clots. Its distinguished properties in comparison to most SVSPs stimulate further studies in an attempt to validate its potential as a defibrinogenating agent. (AU)

• Processo FAPESP: 11/23236-4 - Toxinas animais nativas e recombinantes: análise funcional, estrutural e molecular
• Beneficiário: Suely Vilela
• Modalidade de apoio: Auxílio à Pesquisa - Temático