کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8329670 1540228 2016 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lipase of Bacillus stratosphericus L1: Cloning, expression and characterization
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Lipase of Bacillus stratosphericus L1: Cloning, expression and characterization
چکیده انگلیسی
Present work was undertaken to discover new lipolytic enzymes as well as novel bacterial strains for applications in biotechnology. One of the isolated strains identified as Bacillus stratosphericus L1 produced extracellular lipase (LipBST) which was cloned and expressed in Escherichia coli. Purified mature enzyme had a molecular mass of 19 kDa. Recombinant protein showed an activity of 6244.5 U/mg at pH 9, 35 °C. It was stable in the range of 35-55 °C and retained more than 60% activity after incubation for 4 h. LipBST was activated by organic solvents such as acetone and n-hexane. Lipase was inactivated by all investigated metal ions, inhibitors and detergents. LipBST was determined to be short-chain specific, but also hydrolyzed medium-, long-chain p-nitrophenyl and natural fatty substrates. The values of Vmax and KM for p-nitrophenyl butyrate, p-nitrophenyl caprylate, p-nitrophenyl decanoate were 1.1, 2.5, 0.1 mM min−1 and 5 × 10−2, 3.4 × 10−2, 194 × 10−2 mM, respectively. Biochemical characteristics of LipBST suggest a great potential for various biotechnological applications including detergent formulation, bioremediation and organic synthesis processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 92, November 2016, Pages 96-104
نویسندگان
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