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- W2945436836 abstract "2-Keto-L-gulonic acid (2-KLG) is the direct precursor of vitamin C in industrial synthesis. 2-KLG is mainly produced via the classical two-step fermentation route. In the two-step fermentation process, 2-KLG can be synthesized from L-sorbose by Ketogulonicigenium vulgare aided by Bacillus megaterium. There are five sorbose/sorbosone dehydrogenases (SSDHs), SSDA1, SSDA1-P, SSDA2, SSDA3 and SSDB, and two sorbosone dehydrogenases (SNDHs), glucose/sorbosone dehydrogenase (GSNDH) and sorbosone dehydrogenase (SNDH), in K. vulgare, which could play crucial roles in transforming L-sorbose or L-sorbosone to 2-KLG. However, confusion about the catalytic characteristics of the individual SSDHs and SNDHs makes construction of a recombinational strain for the purpose of enhancing 2-KLG production difficult. In this study, the five SSDHs and two SNDHs from K. vulgare WSH-001 were purified, and their optimal pH values and reaction temperatures, kinetic properties, thermostabilities, substrate spectra and effects of electron acceptors on their performances were systematically determined. Among these dehydrogenases, only SSDA1 and SSDA3 have high activity for catalyzing L-sorbose to 2-KLG directly. These data provide more clues for ways to achieve enhanced conversion of L-sorbose in K. vulgare, which could facilitate both the construction of a more efficient one-step fermentation 2-KLG producer and the reconstruction of a one-step fermentation process." @default.
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- W2945436836 date "2019-08-01" @default.
- W2945436836 modified "2023-10-15" @default.
- W2945436836 title "Systematic characterization of sorbose/sorbosone dehydrogenases and sorbosone dehydrogenases from Ketogulonicigenium vulgare WSH-001" @default.
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- W2945436836 doi "https://doi.org/10.1016/j.jbiotec.2019.05.010" @default.
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