NDLI: Reduction of hydrogen peroxide stress derived from fatty acid beta-oxidation improves fatty acid utilization in Escherichia coli

Content Provider	Springer Nature Link
Author	Doi, Hidetaka Hoshi, Yasushi Nakase, Kentaro Usuda, Yoshihiro
Copyright Year	2013
Abstract	Fatty acids are a promising raw material for substance production because of their highly reduced and anhydrous nature, which can provide higher fermentation yields than sugars. However, they are insoluble in water and are poorly utilized by microbes in industrial fermentation production. We used fatty acids as raw materials for l-lysine fermentation by emulsification and improved the limited fatty acid-utilization ability of Escherichia coli. We obtained a fatty acid-utilizing mutant strain by laboratory evolution and demonstrated that it expressed lower levels of an oxidative-stress marker than wild type. The intracellular hydrogen peroxide (H2O2) concentration of a fatty acid-utilizing wild-type E. coli strain was higher than that of a glucose-utilizing wild-type E. coli strain. The novel mutation rpsA D210Y identified in our fatty acid-utilizing mutant strain enabled us to promote cell growth, fatty-acid utilization, and l-lysine production from fatty acid. Introduction of this rpsA D210Y mutation into a wild-type strain resulted in lower H2O2 concentrations. The overexpression of superoxide dismutase (sodA) increased intracellular H2O2 concentrations and inhibited E. coli fatty-acid utilization, whereas overexpression of an oxidative-stress regulator (oxyS) decreased intracellular H2O2 concentrations and promoted E. coli fatty acid utilization and l-lysine production. Addition of the reactive oxygen species (ROS) scavenger thiourea promoted l-lysine production from fatty acids and decreased intracellular H2O2 concentrations. Among the ROS generated by fatty-acid β-oxidation, H2O2 critically affected E. coli growth and l-lysine production. This indicates that the regression of ROS stress promotes fatty acid utilization, which is beneficial for fatty acids used as raw materials in industrial production.
Starting Page	629
Ending Page	639
Page Count	11
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	98
Issue Number	2
e-ISSN	14320614
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-30
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Escherichia coli Fatty acid metabolism Reactive oxygen species Oxidative stress Hydrogen peroxide stess l-Lysine production Microbiology Microbial Genetics and Genomics Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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Reduction of hydrogen peroxide stress derived from fatty acid beta-oxidation improves fatty acid utilization in Escherichia coli

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