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Biosynthesis of enantiopure (S)-3-hydroxybutyric acid in metabolically engineered Escherichia coli.

Abstract：

:A biosynthetic pathway for the production of (S)-3-hydroxybutyric acid (S3HB) from glucose was established in recombinant Escherichia coli by introducing the beta-ketothiolase gene from Ralstonia eutropha H16, the (S)-3-hydroxybutyryl-CoA dehydrogenase gene from R. eutropha H16, or Clostridium acetobutylicum ATCC824, and the 3-hydroxyisobutyryl-CoA hydrolase gene from Bacillus cereus ATCC14579. Artificial operon consisting of these genes was constructed and was expressed in E. coli BL21 (DE3) codon plus under T7 promoter by isopropyl beta-D: -thiogalactoside (IPTG) induction. Recombinant E. coli BL21 (DE3) codon plus expressing the beta-ketothiolase gene, the (S)-3-hydroxybutyryl-CoA dehydrogenase gene, and the 3-hydroxyisobutyryl-CoA hydrolase gene could synthesize enantiomerically pure S3HB to the concentration of 0.61 g l(-1) from 20 g l(-1) of glucose in Luria-Bertani medium. Fed-batch cultures of recombinant E. coli BL21 (DE3) codon plus were carried out to achieve higher titer of S3HB with varying induction time and glucose concentration during fermentation. Protein expression was induced by addition of 1 mM IPTG when cell concentration reached 10 and 20 g l(-1) (OD(600) = 30 and 60), respectively. When protein expression was induced at 60 of OD(600) and glucose was fed to the concentration of 15 g l(-1), 10.3 g l(-1) of S3HB was obtained in 38 h with the S3HB productivity of 0.21 g l(-1)h(-1). Lowering glucose concentration to 5 g l(-1) and induction of protein expression at 30 of OD(600) significantly reduced final S3HB concentration to 3.7 g l(-1), which also resulted in the decrease of the S3HB productivity to 0.05 g l(-1)h(-1).

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Lee SH,Park SJ,Lee SY,Hong SH

doi

10.1007/s00253-008-1473-7

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

633-41

issue

4

eissn

0175-7598

issn

1432-0614

journal_volume

79

pub_type

杂志文章

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