Production and characterization of extracellular α-amylase produced by Wickerhamia sp. X-Fep.
Appl Biochem Biotechnol
; 167(7): 2117-29, 2012 Aug.
Article
en En
| MEDLINE
| ID: mdl-22678824
A yeast isolate able to produce high levels of extracellular α-amylase was selected from a collection of 385 yeasts and identified as Wickerhamia sp. by the sequence of the D1/D2 domain of the 26 S rDNA gene. Part of the nucleotide sequence of the amy1-W gene was cloned, and a sequence of 191 amino acids deduced from this gene was analyzed. The peptide contains three characteristic well-conserved regions in the active sites of α-amylases (EC 3.2.1.1). The enzyme was purified and in situ activity showed only one band with amylolytic activity. The molecular mass of the α-amylase was estimated at 54 kDa by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Enzymatic activity on soluble starch as substrate was optimal at pH 5-6 and 50 °C. This thermostable enzyme was inhibited by EDTA-Na(2) and 1,10-phenanthroline; the activity of the dialyzed enzyme was reactivated with Ca(2+) and Mg(2+) cations, which indicates that the α-amylase is a metalloenzyme. α-Amylase production was induced by starch and maltose and repressed by glucose. The high yield and productivity found in this work makes this Wickerhamia sp. strain a promising candidate for the biotechnological production of α-amylase.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ascomicetos
/
Alfa-Amilasas
/
Espacio Extracelular
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Appl Biochem Biotechnol
Año:
2012
Tipo del documento:
Article
País de afiliación:
México
Pais de publicación:
Estados Unidos