Data/hora: 09/06/2024 01:48:50

Provedor de dados: | 58
País: | Brazil
Título: | Production and characterization of tyrosinase activity in Pycnoporus sanguineus CCT-4518 crude extract
Autores: | Duarte,Lívia Teixeira; Tiba,Joyce Batista; Santiago,Mariângela Fontes; Garcia,Telma Alves; Bara,Maria Teresa Freitas.
Data: | 2012-03-01
Ano: | 2012
Palavras-chave: | Pycnoporus sanguineus; White-rot fungi; Tyrosinase; MBTH; Biotechnology.
Resumo: | Tyrosinase is an enzyme of industrial interest. The production and characterization of tyrosinase from P. sanguineus CCT-4518 were investigated. The selection of inductors, luminosity influence, inoculum size and type of culture medium on the production of tyrosinase and the effect of inhibitors on enzyme activity were performed. Optimum conditions for intracellular tyrosinase production was observed after 2 days using 0.15% L-tyrosine as inducer, in the presence of light, with inoculum size of 10 mycelium discs, using 2% malt extract broth medium, incubated at 30°C, and constant agitation of 150 rpm. Tyrosinase activity was completely inhibited by the addition of 6 mM salicylhydroxamic acid or phenylthiourea, however an inhibition of 4.15% was recorded by the addition of 0.1 mM sodium azide. No inhibition could be detected in case of 0.1 mM phenyl methanesulfonyl fluoride addition. Optimal conditions for intracellular tyrosinase activity using L-dopa as substrate were observed at pH 6.6 and 45°C. Thermal stability studies indicated that the enzyme is stable at 45°C for 15 minutes. Higher temperatures decreased tyrosinase activity. Enzyme production was confirmed by non-denaturing polyacrylamide gel electrophoresis and the protein profile was investigated by denaturing polyacrylamide gel electrophoresis.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100003
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1590/S1517-83822012000100003
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.43 n.1 2012
Fonte: | info:eu-repo/semantics/openAccess