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- W2912563687 abstract "ABSTRACT A novel thermostable carboxylesterase (Est5250) of thermoalkaliphilic bacterium Bacillus thermocloaceae was heterologously expressed in Escherichia coli and its biochemical properties were investigated. Est5250 showed optimum esterase activity at 60 °C and pH 8.0. The enzyme was highly thermostable at 60 °C, interestingly, the thermostability was enhanced in the presence of Ca2+, retaining more than 60% of its original activity after 12 h of pre-incubation. Est5250 was active in the presence of 1% (v/v) of organic solvents and 0.1% (v/v) of non-ionic detergents. The enzyme activity was significantly enhanced up to 167% and 159% in the presence of 2-mercaptoethanol and dithiothreitol, respectively. Est5250 showed high substrate specificity for short-chain p-nitrophenyl-esters. Kinetic constants, Km and kcat, for p-nitrophenyl-acetate were 185.8 μM and 186.6 s−1, respectively. Est5250 showed outstanding thermostability and tolerance to various organic solvents under thermoalkaliphilic conditions, suggesting that it would be a highly suitable biocatalyst for various biotechnological applications. Abbreviations: B. thermocloaceae sp.: Bacillus thermocloaceae; E. coli: Escherichia coli; NP: nitrophenyl; DMSO: dimethyl sulfoxide; SDS-PAGE: sodium dodecyl sulfate-polyacrylamide gel electrophoresis; DMF: dimethyl formamide; EGTA: ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid; CTAB: cetrimonium bromide; PMSF: phenylmethylsulfonyl fluoride; DEPC: diethyl pyrocarbonate; 2-ME: 2-mercaptoethanol; DTT: dithiothreitol" @default.
- W2912563687 created "2019-02-21" @default.
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- W2912563687 date "2019-05-04" @default.
- W2912563687 modified "2023-10-01" @default.
- W2912563687 title "Characterization of a novel thermostable carboxylesterase from thermoalkaliphilic bacterium <i>Bacillus thermocloaceae</i>" @default.
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- W2912563687 doi "https://doi.org/10.1080/09168451.2019.1574555" @default.
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