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Expression and characterization of a thermostable sarcosine oxidase (SOX) from Bacillus sp. in Escherichia coli

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Abstract

A heat-stable sarcosine oxidase produced by Bacillus sp. BSD-8 (SOX) had been studied and its complete gene sequence, which contained 1,164 bp nucleotides and encoded a protein of 387 amino acids, was obtained by DNA Walking method. The sox gene was cloned and functionally overexpressed in E. coli and the recombinant SOX (rSOX) was purified to homogeneity, its properties was studied and compared with the wild type of SOX. The rSOX as well as SOX was stable at 60°C and at pH 7.0∼10.0, respectively. The optimal temperature for this enzyme was 60°C and at pH 8.5, it showed its highest activity. The Km and Kcat of the enzyme was 3.1 mM and 20.3/s, respectively. The difference between the properties of the SOX and rSOX was that the SOX contained noncovalent FAD, whereas the rSOX contained covalent FAD. The study also showed that an increased number of alanine residues in the rSOX might have some contribution in the enzymatic thermostability.

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Correspondence to Xiaohang Ma.

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Guo, K., Ma, X., Sun, G. et al. Expression and characterization of a thermostable sarcosine oxidase (SOX) from Bacillus sp. in Escherichia coli . Appl Microbiol Biotechnol 73, 559–566 (2006). https://doi.org/10.1007/s00253-006-0502-7

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  • DOI: https://doi.org/10.1007/s00253-006-0502-7

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