The microbial biosynthesis of fatty acid, which can be used as precursors for the production of fuels of chemicals from renewable carbon sources, has attracted significant attention in recent years and related fields have been actively studied. To produce fatty acid from bacteria, the functions of enzymes involved in fatty acid synthesis and proteins encoded by related genes on the fatty acid synthesis pathway have been also studied in the FAS system of bacteria. Therefore, the goal of this study was to increase the production of long-chain fatty acids by developing recombinant E. coli strains that were improved by an elongation cycle during fatty acid synthesis (FAS). The fabF (β-oxoacyl-[acyl-carrier-protein] synthase II), fabG (β- oxoacyl-[acylcarrier- protein] reductase), fabZ (β-hydroxyacyl-[acyl-carrier-protein] dehydratase) and fabI (enoyl-[acyl-carrier-protein] reductase) genes, all homologous of E. coli, were induced to improve the enzymatic activities for the purpose of over- expressing components of the elongation cycle in the FAS pathway through metabolic engineering. The developed E. coli strains contained various gene combinations with the pSTV28 expression vector. In vivo productivity of total fatty acids was analyzed to confirm the changes and effects of inserted genes in E. coli at different incubation temperatures. As a result, total fatty acid contents including hexadecanoic acid and octadecanoic acid such as saturated fatty acid and unsaturated fatty acid were produced higher in developed strains than those from the wild-type E. coli. Especially total fatty acid was produced 2.4 fold higher than E. coli JESH1007, one of the developed reombinants through this study, at 20℃.
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
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