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Characterization and a point mutational approach of a psychrophilic lipase from an arctic bacterium, Bacillus pumilus

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Title
Characterization and a point mutational approach of a psychrophilic lipase from an arctic bacterium, Bacillus pumilus
Authors
Wi, Ah Ram
Jeon, Sung-Jong
Kim, Sunghui
Park, Ha Ju
Kim, Dockyu
Han, Se Jong
Yim, Joung Han
Kim, Han-Woo
Subject
Biotechnology & Applied Microbiology
Keywords
Arctic bacterium; Bacillus pumilus; Lipase; Psychrophilic lipase; Rational mutation
Issue Date
2014
Citation
Wi, Ah Ram., et al. 2014. Characterization and a point mutational approach of a psychrophilic lipase from an arctic bacterium, Bacillus pumilus. Biotechnology Letters, 36(6): 1295-1302.
Abstract
A bacterium with lipolytic activity was isolated from the Chukchi Sea within the Arctic Ocean. The lipase BpL5 from the isolate, Bacillus pumilus ArcL5, belongs to subfamily 4 of lipase family I. The optimum pH and temperature of the recombinant enzyme BpL5, as expressed in Escherichia coli, were 9.0 and 20℃, respectively. The enzyme retained 85 % of its activity at 5 ℃. There was a significant difference between temperatures for maximal activity (20℃) and for protein denaturation (approx. 45℃). The enzyme preferred middle-chain (C8) p-nitrophenyl substrates. Two mutants, S139A and S139Y, were rationally designed based on the 3D structure model, and their activities were compared with that of the wild type. The both mutants showed significantly improved activity against tricaprylin.
DOI
10.1007/s10529-014-1475-8
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