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Type: Artigo de periódico
Title: Rapid Purification And Procoagulant And Platelet Aggregating Activities Of Rhombeobin: A Thrombin-like/gyroxin-like Enzyme From Lachesis Muta Rhombeata Snake Venom.
Author: Torres-Huaco, Frank Denis
Werneck, Cláudio C
Vicente, Cristina Pontes
Vassequi-Silva, Talita
Nery-Diez, Ana Cláudia Coelho
Mendes, Camila B
Antunes, Edson
Marangoni, Sérgio
Damico, Daniela C S
Abstract: We report a rapid purification method using one-step chromatography of SVSP Rhombeobin (LMR-47) from Lachesis muta rhombeata venom and its procoagulant activities and effects on platelet aggregation. The venom was fractionated by a single chromatographic step in RP-HPLC on a C8 Discovery BIO Wide Pore, showing high degree of molecular homogeneity with molecular mass of 47035.49 Da. Rhombeobin showed amidolytic activity upon BA ρ NA, with a broad optimum pH (7-10) and was stable in solution up to 60°C. The amidolytic activity was inhibited by serine proteinase inhibitors and reducing agents, but not chelating agents. Rhombeobin showed high coagulant activity on mice plasma and bovine fibrinogen. The deduced amino acid sequence of Rhombeobin showed homology with other SVSPs, especially with LM-TL (L. m. muta) and Gyroxin (C. d. terrificus). Rhombeobin acts, in vitro, as a strong procoagulant enzyme on mice citrated plasma, shortening the APTT and PT tests in adose-dependent manner. The protein showed, ex vivo, a strong defibrinogenating effect with 1 µg/animal. Lower doses activated the intrinsic and extrinsic coagulation pathways and impaired the platelet aggregation induced by ADP. Thus, this is the first report of a venom component that produces a venom-induced consumptive coagulopathy (VICC).
Subject: Amino Acid Sequence
Blood Coagulation
Blood Platelets
Chromatography, High Pressure Liquid
Crotalid Venoms
Molecular Sequence Data
Molecular Weight
Partial Thromboplastin Time
Platelet Aggregation
Prothrombin Time
Serine Proteases
Snake Venoms
Spectrometry, Mass, Electrospray Ionization
Rights: aberto
Identifier DOI: 10.1155/2013/903292
Date Issue: 2013
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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