Abstract
A putative α-amylase gene (accession number, CP000284) of Methylobacillus flagellatus KT ATCC51484 was cloned in Escherichia coli, and its gene product was expressed and characterized. The purified recombinant enzyme (MFAS) displayed a typical amylosucrase (ASase) activity by the demonstration of multiple activities of hydrolysis, isomerization, and polymerization although it was designated as an α-amylase. The optimal reaction temperature and pH for the sucrose hydrolysis activity of MFAS were determined to be 45 °C and pH 8.5, respectively. MFAS has relatively high thermostable characteristics compared with other ASases, as demonstrated by a half-life of 19.3 min at 50 °C. MFAS also showed polymerization activity using sucrose as a sole substrate. Glycerol was transglycosylated by the intermolecular transglycosylation activity of MFAS. Two major products were observed by thin-layer chromatography and isolated by paper chromatography and recycling HPLC. Using 1H and 13C NMR, their chemical structures were determined to be (2S)-1-O-α-d-glucosyl-glycerol or (2R)-1-O-α-d-glucosyl-glycerol and 2-O-α-d-glucosyl-glycerol, in which a glucose molecule is linked to glycerol via an α-glycosidic linkage.
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Acknowledgment
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (No. 2013–031011) and by Business for Cooperative R&D between Industry, Academy, and Research Institute funded Korea Small and Medium Business Administration in 2013 (Grant No. C0123542).
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Jin-Woo Jeong and Dong-Ho Seo contributed equally.
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Jeong, JW., Seo, DH., Jung, JH. et al. Biosynthesis of Glucosyl Glycerol, a Compatible Solute, Using Intermolecular Transglycosylation Activity of Amylosucrase from Methylobacillus flagellatus KT. Appl Biochem Biotechnol 173, 904–917 (2014). https://doi.org/10.1007/s12010-014-0889-z
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DOI: https://doi.org/10.1007/s12010-014-0889-z