Highly thermostable and alkaline α-amylase from a halotolerant-alkaliphilic Bacillus sp. AB68

Brazilian Journal of Microbiology

Ashabil Aygan²  Burhan Arikan¹  Hatice Korkmaz¹  Sadik Dinçer¹  Ömer Çolak¹ 

[1] ,Kahramanmaras Sutcu Imam University Faculty of Science and Letters Department of BiologyK. Maras,Turkey

关键词: Bacillus sp.;    α-amylase;    alkaliphilic;    thermostable;    enzyme;    Bacillus sp;    α-amilase;    alcalifílico;    termoestável;    enzima;   

DOI  :  10.1590/S1517-83822008000300027

来源: SciELO

【 摘 要 】

An alkaliphilic and highly thermostable α-amylase producing Bacillus sp. was isolated from Van soda lake. Enzyme synthesis occurred at temperatures between 25ºC and 40ºC. Analysis of the enzyme by SDS-PAGE revealed a single band which was estimated to be 66 kDa. The enzyme was active in a broad temperature range, between 20ºC and 90ºC, with an optimum at 50ºC; and maximum activity was at pH 10.5. The enzyme was almost completely stable up to 80ºC with a remaining activity over 90% after 30 min pre-incubation. Thermostability was not increased in the presence of Ca2+. An average of 75% and 60ºC of remaining activity was observed when the enzyme was incubated between pH 5 and 9 for 1 h and for 2 h, respectively. The activity of the enzyme was inhibited by SDS and EDTA by 38% and 34%, respectively.

【 授权许可】

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