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- W1204168695 abstract "A novel gene encoding a thermostable esterase (designated as Est-gela) was isolated from the moderate thermophile Bacillus gelatini KACC 12197. The open reading frame of this gene (1170 bp) encodes 389 amino acid residues, and the molecular weight of Est-gela is approximately 42 kDa. The protein sequence of Est-gela shows similarity with β-lactamases and esterases (⩽ 43%). Est-gela contains the Ser-X-X-Lys conserved sequence (Ser58-Met59-Thr60-Lys61) and belongs to family VIII of esterases. We overexpressed Est-gela in Escherichia coli XL1-blue and purified this protein using a His tag. Est-gela showed a strong enzymatic activity toward p-nitrophenyl esters with short acyl chains (⩽ C4) and the strongest activity toward p-nitrophenyl butyrate. Est-gela showed an enhanced enzymatic activity at 65-75 °C and retained more than 90% of the activity after incubation at 65 °C for 180 min. These results indicated that Est-gela was thermostable. In addition, Est-gela showed the maximal activity at pH 10. We also evaluated the effects of surfactants and organic solvents. Surfactants were more effective at improving the enzymatic activity than were organic solvents. Finally, Est-gela hydrolyzed (R,S)-ketoprofen ethyl ester (Kcat/Km = 5.0 ± 0.2 s(-1) mM(-1), mean ± standard error) with enantioselectivity toward (S)-ketoprofen ethyl ester rather than (R)-ketoprofen ethyl ester." @default.
- W1204168695 created "2016-06-24" @default.
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- W1204168695 date "2015-12-01" @default.
- W1204168695 modified "2023-09-26" @default.
- W1204168695 title "Cloning and characterization of a novel thermostable esterase from Bacillus gelatini KACC 12197" @default.
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- W1204168695 doi "https://doi.org/10.1016/j.pep.2015.08.009" @default.
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