Abstract
Bacillus stearothermophilus leucine aminopeptidase II (LAPII) was fused at its C-terminal end with the raw-starch-binding domain of Bacillus sp. strain TS-23 α-amylase. The chimeric enzyme (LAPsbd), with an apparent molecular mass of approximately 61 kDa, was overexpressed in IPTG-induced Escherichia coli cells and purified to homogeneity by nickel-chelate chromatography. The purified enzyme retained LAP activity and adsorbed raw starch. LAPsbd was stable at 70°C for 10 min, while the activity of wild-type enzyme was completely abolished under the same environmental condition. Compared with the wild-type enzyme, the twofold increase in the catalytic efficiency for LAPsbd was due to a 218% increase in the k cat value.
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This work was supported by a research grant (NSC 92-2313-B-415-005) from the National Science Council of the Republic of China.
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Hua, YW., Chi, MC., Lo, HF. et al. Fusion of Bacillus stearothermophilus leucine aminopeptidase II with the raw-starch-binding domain of Bacillus sp. strain TS-23 α-amylase generates a chimeric enzyme with enhanced thermostability and catalytic activity. J IND MICROBIOL BIOTECHNOL 31, 273–277 (2004). https://doi.org/10.1007/s10295-004-0146-5
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DOI: https://doi.org/10.1007/s10295-004-0146-5