Data/hora: 05/06/2024 10:53:47

Provedor de dados: | 58
País: | Brazil
Título: | Aflatoxin detoxification by manganese peroxidase purified from Pleurotus ostreatus
Autores: | Yehia,Ramy Sayed.
Data: | 2014-01-01
Ano: | 2014
Palavras-chave: | Manganese peroxidase; Aflatoxin B1; Pleurotus ostreatus; Purification.
Resumo: | Manganese peroxidase (MnP) was produced from white rot edible mushroom Pleurotus ostreatus on the culture filtrate. The enzyme was purified to homogeneity using (NH4)2SO4 precipitation, DEAE-Sepharose and Sephadex G-100 column chromatography. The final enzyme activity achieved 81UmL-1, specific activity 78 U mg-1 with purification fold of 130 and recovery 1.2% of the crude enzyme. SDS-PAGE indicated that the pure enzyme have a molecular mass of approximately 42 kDa. The optimum pH was between 4-5 and the optimum temperature was 25 ºC. The pure MnP activity was enhanced by Mn2+,Cu2+,Ca2+ and K+ and inhibited by Hg+2 and Cd+2.H2O2 at 5 mM enhanced MnP activity while at 10 mM inhibited it significantly. The MnP-cDNA encoding gene was sequenced and determined (GenBank accession no. AB698450.1). The MnP-cDNA was found to consist of 497 bp in an Open Reading Frame (ORF) encoding 165 amino acids. MnP from P. ostreatus could detoxify aflatoxin B1 (AFB1) depending on enzyme concentration and incubation period. The highest detoxification power (90%) was observed after 48 h incubation at 1.5 U mL-1 enzyme activities.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000100018
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1590/S1517-83822014005000026
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.45 n.1 2014
Fonte: | info:eu-repo/semantics/openAccess