Efficient synthesis of d-phenyllactic acid by a whole-cell biocatalyst co-expressing glucose dehydrogenase and a novel d-lactate dehydrogenase from Lactobacillus rossiae.

ABSTRACT: d-Phenyllactic acid is a versatile natural organic acid, which is used as an antiseptic agent, monomer of the biodegradable material poly-phenyllactic acid and in the synthesis chiral intermediate of pharmaceuticals. In this report, the novel NADH-dependent d-lactate dehydrogenase LrLDH was identified by screening a shotgun genome of Lactobacillus rossiae. To improve cofactor regeneration, the Exiguobacterium sibiricum glucose dehydrogenase EsGDH was overexpressed together with LrLDH in E. coli BL21(DE3)-pCDFDuet-1-gdh-ldh. The total enzyme activity in the fermentation broth of E. coli BL 21(DE3)-pCDFDuet-1-gdh-ldh peaked at 2359.0 U l^-1 when induced by 10 g l^-1 lactose at 28 °C and 150 rpm f

SUBMITTER: Luo X 

PROVIDER: S-EPMC6904706 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature