Abstract
A novel amylase AmyFlA from Flavobacterium sp. NAU1659, AmyFlA, was cloned and expressed in Esherichia coli. Based on phylogenetic and functional analysis, it was identified as a novel member of the subfamily GH13_46, sharing high sequence identity. The protein was predicted to consist of 620 amino acids, with a putative signal peptide of 25 amino acids. The enzyme was able to hydrolyze soluble starch with a specific activity of 352.97 U/mg at 50 °C in 50 mM phosphate buffer (pH 6.0). The Km and Vmax values of AmyFlA were respectively 3.15 mg/ml and 566.36 µmol·ml−1·min−1 under optimal conditions. Its activity towards starch was enhanced by 63% in the presence of 1 mM Ca2+, indicating that AmyFlA was a Ca2+-dependent amylase. Compared to the reported maltogenic amylases, AmyFlA produced a lower variety of intermediate oligosaccharides at the start of the reaction so that the product mixture contained a higher proportion of maltose. These results indicate that AmyFlA may be potential application value in the production of high-maltose syrup.
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This work was supported by the Natural Science Foundation of China (32370119) and Liaocheng University (No 318052291).
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YX Wang and XF Ye designed the experiments and wrote the manuscript. YX Wang carried out the experiments. HR Xue and ZS Zhao provided help in the construction of the plasmid. TT **e and GH Yan helped to finish the experiments. XF Ye provided valuable suggestions for improving the experimental methods. All authors read and approved the final manuscript.
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Wang, Y., **e, T., Yan, G. et al. Heterologous Expression and Characterization of a Novel Mesophilic Maltogenic α-Amylase AmyFlA from Flavobacterium sp. NAU1659. Appl Biochem Biotechnol (2024). https://doi.org/10.1007/s12010-024-04874-x
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DOI: https://doi.org/10.1007/s12010-024-04874-x