Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/100711
Type: Artigo de periódico
Title: The Amino Acid Sequence Of Bothropstoxin-ii, An Asp-49 Myotoxin From Bothrops Jararacussu (jararacucu) Venom With Low Phospholipase A2 Activity
Author: Pereira M.F.
Novello J.C.
Cintra A.C.O.
Giglio J.R.
Landucci E.T.
Oliveira B.
Marangoni S.
Abstract: The complete amino acid sequence of bothropstoxin-II (BthTX-II), a myotoxin isolated from Bothrops jararacussu snake venom, is reported. The results show that BthTX-II is an Asp-49 phospholipase A2 (PLA2)-like protein composed of a single polypeptide chain of 120 amino acid residues (Mr = 13,976), containing one methionine and 14 half-cystines. Despite a high degree of homology with other PLA2's and the presence of the strategic residues known to compose the Ca2+-binding loop, namely Tyr-28, Gly-30, Gly-32, and especially Asp-49, besides His-48, Tyr-52, and Asp-99, all of them directly or indirectly involved in catalysis, BthTX-II revealed a very low PLA2 activity when assayed on egg yolk phosphatidylcholine. We attribute this low catalytic activity to the existence of extra mutations, e.g., Trp-5 for Phe-5, which points to the need of considering other strategic positions, since only Lys-49 PLA2's have been considered to be devoid of this enzymatic activity. © 1998 Plenum Publishing Corporation.
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Rights: fechado
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-54749084586&partnerID=40&md5=dcf08a981b6244e1a67bc66cb1a6a03a
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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