Production of Enantiomerically Pure [R]-3-Hydroxybutyric acid by Metabolically Engineered Escherichia coli with Inducible System

Inducible System을 이용한 재조합 대장균으로부터 광학적으로 순수한 [R]-3-Hydroxybutyric acid 생산

  • 이영 ;
  • 최종일 (한국과학기술원 생명화학공학과 및 생물공정연구센터) ;
  • 이상엽 (한국과학기술원 생명화학공학과 및 생물공정연구센터, 한국과학기술원 바이오시스템학과)
  • Published : 2004.08.01

Abstract

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. Two different PHB biosynthesis genes from Alcaligenes latus and R. eutropha were compared for the production of R3HB. This strategy can be used for the production of enantiomerically pure (R)-hydroxycarboxylic acids with high concentration.

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