Produção Nacional
Revisado por pares
Production, purification and characterization of a thermostable β-1,3-glucanase (laminarinase) produced by Moniliophthora perniciosa
2011; Brazilian Academy of Sciences; Volume: 83; Issue: 2 Linguagem: Inglês
10.1590/s0001-37652011005000007
ISSN1678-2690
AutoresAmanda Reges de Sena, Gildomar Lima Valasques, Aristóteles Goés‐Neto, Alex Gutterres Taranto, Carlos Priminho Pirovani, Júlio Cézar M. Cascardo, Russolina B. Zingali, Marcos Almeida Bezerra, Sandra Aparecida de Assis,
Tópico(s)Enzyme Production and Characterization
ResumoThe enzyme glucanase from Moniliophthora perniciosa was produced in liquid medium and purified from the culture supernatant. A multivariate statistical approach (Response Surface Methodology - RSM) was employed to evaluate the effect of variables, including inducer (yeast extract) and fermentation time, on secreted glucanase activities M. perniciosa detected in the culture medium. The crude enzyme present in the supernatant was purified in two steps: precipitation with ammonium sulfate (70%) and gel filtration chromatography on Sephacryl S-200. The best inducer and fermentation time for glucanase activities were 5.9 g L(-1) and 13 days, respectively. The results revealed three different isoforms (GLUI, GLUII and GLUIII) with purification factors of 4.33, 1.86 and 3.03, respectively. The partially purified enzymatic extract showed an optimum pH of 5.0 and an optimum temperature of 40°C. The enzymatic activity increased in the presence of KCl at all concentrations studied. The glucanase activity was highest in the presence of 0.2 M NaCl. The enzyme showed high thermal stability, losing only 10.20% of its specific activity after 40 minutes of incubation at 90°C. A purified enzyme with relatively good thermostability that is stable at low pH might be used in future industrial applications.
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