IDENTIFICATION of SERINE PROTEINASES WITH TONIN-LIKE ACTIVITY in the RAT SUBMANDIBULAR and PROSTATE-GLANDS

IDENTIFICATION of SERINE PROTEINASES WITH TONIN-LIKE ACTIVITY in the RAT SUBMANDIBULAR and PROSTATE-GLANDS

Autor Araujo, G. W. Google Scholar
Pesquero, J. B. Google Scholar
Lindsey, C. J. Google Scholar
Paiva, ACM Google Scholar
Pesquero, J. L. Google Scholar
Instituição Universidade Federal de Minas Gerais (UFMG)
Universidade Federal de São Paulo (UNIFESP)
Resumo Two enzymes with tonin-like activity, designated rSMT3 and rSMT4, were purified from rat submandibular glands and another, rPT1, was obtained from the prostate. the three enzyme fractions hydrolysed angiotensin I, angiotensinogen (AG) and synthetic AG(1-14) to form angiotensin II. With angiotensin I as substrate, pH optima were 6.5 for rSMT3, 6.8 for rSMT4 and 7.5 for rPT1. With AG(1-14), the three enzymes had optimal activity at pH 7.5. the three enzymes had negligible activity upon a kallikrein substrate, Ac-Phe-Arg-Nan. the enzymes were inhibited by aprotinin, soybean trypsin inhibitor and phenylmethanesulfonyl fluoride but not by two angiotensin converting enzyme inhibitors, ethylenediaminetetracetic acid or enalaprilat. N-tosyl-L-phenylalanine chloromethyl ketone (1 mM) inhibited rPT1 and rSMT4 but not rSMT3. Molecular weights (SDS-PAGE) were 31 700 for rSMT3, 29 800 for rSMT4 and 28 100 for rPT1. Total activity in the prostate is 150-times lower than in the submandibular gland, where 92% of the tonin activity is related to rSMT4. Physical and chemical properties suggest that rSMT4 is tonin, whereas rSMT3 and rPT1 are tonin-like enzymes which can generate angiotensin II from different substrates.
Palavra-chave PROSTATE GLAND
SERINE PROTEINASE
SUBMANDIBULAR GLAND
TONIN
Idioma Inglês
Data de publicação 1991-05-24
Publicado em Biochimica Et Biophysica Acta. Amsterdam: Elsevier B.V., v. 1074, n. 1, p. 167-171, 1991.
ISSN 0006-3002 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 167-171
Fonte http://dx.doi.org/10.1016/0304-4165(91)90056-M
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:A1991FQ67900028
Endereço permanente http://repositorio.unifesp.br/handle/11600/25203

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