Production of Enantiomerically Pure (R)-3-Hydroxybutyric acid by Metabolically Engineered Escherichia coli with Inducible System
Lee, Y.(ChiroBio Inc., Daejeon, Republic of Korea) | Choi, J.I.;Lee, S.Y.(Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea)E-mail:[email protected]
An inducible expression system of poly[(R)-3-hydroxybutyrate] (PHB) depolymerization was established in metabolically engineered Escherichia coli with the PHB biosynthesis genes. The Ralstonia eutropha PHB depolymerase gene was cloned in a vector system containing the PHB biosynthesis genes and expressed under inducible promoter. Recombinant E. coli harboring the PHB biosynthesis genes and depolymerase gene was first cultured for the accumulation of PHB, and then the depolymerase was expressed resulting in the degradation of accumulated PHB into (R)-3-hydroxybutyric acid (R3HB). R3HB could be produced with the concentration of 7.6 g/L in flask culture.
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