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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

First serine protease inhibitor isolated from Rhinella schneideri poison

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Autor(es):
Shibao, Priscila Y. T. [1] ; Anjolette, Fernando A. P. [1] ; Lopes, Norberto P. [1] ; Arantes, Eliane C. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Chem & Phys, Sch Pharmaceut Sci Ribeirao Preto, BR-14040903 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of Venomous Animals and Toxins including Tropical Diseases; v. 21, AUG 13 2015.
Citações Web of Science: 7
Resumo

Background: Toad secretions are a source of molecules with potential biotechnological application on a wide spectrum of diseases. Toads from the Rhinella family have two kinds of poisonous glands, namely granular and mucous glands. Rhinella schneideri toads produce granular secretions that comprise a great number of molecules, including serine proteases inhibitors. Serine proteases, such as trypsin, chymotrypsin and elastase, are enzymes that have a serine amino acid into its catalytic site and can be found in a large number of vertebrate species and pathogenic microorganisms. Therefore, the present work aims to purify a serine protease inhibitor from Rhinella schneideri granular secretions. Findings: This study presents the protocol used to purify a serine protease inhibitor from the Rhinella schneideri poison. The granular secretion was submitted to dialysis in order to separate the low molecular weight compounds, which were submitted to a reversed phase-fast protein liquid chromatography fractionation step in a C2C18 column. The major fractions were tested over trypsin, chymotrypsin and elastase through colorimetric assay. The inhibition tests were performed with the enzyme in absence (positive control) and presence of fractions, denatured enzyme (negative control) and the respective chromogenic substrate. Rs20 was the compound with the major inhibitory activity over chymotrypsin, inducing a delay in the formation of the chromogenic enzymatic product. The structure characterization of Rs20 was performed by high resolution electronspray ionization- mass spectrometry (HRESI-MS) and gas chromatography coupled with mass spectrometry (GC-MS). HRESI showed an intense signal suggesting the presence of bufadienolide with less than 10 ppm error. In addition, it was observed a low intense signal at m/z 399 that could be lithocholic acid, a biosynthetic precursor of bufadienolide. Finally, GC-MS analysis applying NIST library identification reinforced this hypothesis. Conclusions: The current study have isolated and partially characterized the function and structure of the first bufadienolide with inhibitory action over chymotrypsin. (AU)

Processo FAPESP: 10/05722-6 - Isolamento e caracterização bioquímica de um inibidor de proteases presente no veneno de Rhinella schneideri
Beneficiário:Priscila Yumi Tanaka Shibao
Linha de fomento: Bolsas no Brasil - Iniciação Científica