Abstract
In this study, a novel high-activity amylosucrase from Salinispirillum sp. LH10-3-1 (SaAS) was identified and characterized. The recombinant enzyme was determined as a monomer with a molecular mass of 75 kDa. SaAS protein exhibited the maximum total and polymerization activities at pH 9.0 and maximum hydrolysis activity at pH 8.0. The optimum temperature for total, polymerization, and hydrolysis activities were 40, 40, and 45 °C, respectively. Under the optimal pH and temperature, SaAS had a specific activity of 108.2 U/mg. SaAS also showed excellent salt tolerance and could retain 77.4% of its original total activity at 4.0 M NaCl. The addition of Mg2+, Ba2+, and Ca2+ enhanced the total activity of SaAS. When the conversion of 0.1 M and 1.0 M sucrose was catalyzed at pH 9.0 and 40 °C for 24 h, the ratios of hydrolysis, polymerization, and isomerization reactions were 11.9:77.4:10.7 and 15.3:53.5:31.2, respectively. The α-arbutin yield of 60.3% was achieved from 20 mM sucrose and 5 mM hydroquinone catalyzed by SaAS.
Key points
• A novel amylosucrase from Salinispirillum sp. LH10-3-1 (SaAS) was characterized.
• SaAS has the highest specific enzyme activity among all known amylosucrase.
• SaAS has hydrolysis, polymerization, isomerization, and glucosyltransferase activities.
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All data generated or analyzed during this study are included in this manuscript.
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Funding
This work was supported by the National Natural Science Foundation of China (Nos. 21473256 and 21776310), the Key Research and Development Project of Shandong Province (No. 2019GSF107077), and the Key Technology of Independent Innovation of Qingdao West Coast New Economic District (2020-6).
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JL designed the study, JL, ZL, HG, and MM conducted the experiments and analyzed data. SL, HY, and HZ assisted the experiments and analyzed data. JL and JL wrote the manuscript. All authors read and approved the manuscript.
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Li, J., Li, Z., Gong, H. et al. Identification and characterization of a novel high-activity amylosucrase from Salinispirillum sp. LH10-3-1. Appl Microbiol Biotechnol 107, 1725–1736 (2023). https://doi.org/10.1007/s00253-023-12430-6
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DOI: https://doi.org/10.1007/s00253-023-12430-6