title: High cell density cultivation of Escherichia coli with surface anchored transglucosidase for use as whole-cell biocatalyst for alpha-arbutin synthesis.
abstract: A fed-batch culture strategy for the production of recombinant Escherichia coli cells anchoring surface-displayed transglucosidase for use as a whole-cell biocatalyst for alpha-arbutin synthesis was developed. Lactose was used as an inducer of the recombinant protein. In fed-batch cultures, dissolved oxygen was used as the feed indicator for glucose, thus accumulation of glucose and acetate that affected the cell growth and recombinant protein production was avoided. Fed-batch fermentation with lactose induction yielded a biomass of 18 g/L, and the cells possessed very high transglucosylation activity. In the synthesis of alpha-arbutin by hydroquinone glucosylation, the whole-cell biocatalysts showed a specific activity of 501 nkat/g cell and produced 21 g/L of arbutin, which corresponded to 76% molar conversion. A sixfold increased productivity of whole cell biocatalysts was obtained in the fed-batch culture with lactose induction, as compared to batch culture induced by IPTG.
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan.
authors.forename: Po-Hung
authors.initials: PH
authors.lastname: Wu
authors.forename: Giridhar R
authors.initials: GR
authors.lastname: Nair
authors.forename: I-Ming
authors.initials: IM
authors.lastname: Chu
authors.forename: Wen-Teng
authors.initials: WT
authors.lastname: Wu
mesh_terms: D000085:Acetates / Q000378:metabolism; D001104:Arbutin / Q000096:biosynthesis*; D018533:Biomass; D020536:Enzyme Activators / Q000494:pharmacology; D004926:Escherichia coli / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D005964:Glucosyltransferases / Q000235:genetics / Q000378:metabolism*; D006873:Hydroquinones / Q000378:metabolism; D007785:Lactose / Q000494:pharmacology; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism
chemical_list: D000085:Acetates; D020536:Enzyme Activators; D029968:Escherichia coli Proteins; D006873:Hydroquinones; D001104:Arbutin; D005964:Glucosyltransferases; D005947:Glucose; D007785:Lactose; D010100:Oxygen; C031927:hydroquinone