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Fatty acid biosynthesis is enhanced in Escherichia coli strains with deletion in genes encoding the PII signaling proteins.
Archives of Microbiology 2018 November 31
The committed and rate-limiting step in fatty acid biosynthesis is catalyzed by acetyl-CoA carboxylase (ACC). In previous studies we showed that ACC activity is inhibited through interactions with the PII signaling proteins in vitro. Here we provide in vivo support for that model; we noted that PII proteins are able to reduce malonyl-CoA levels in vivo in Escherichia coli. Furthermore, we show that fatty acid biosynthesis is strongly enhanced in E. coli strains carrying deletions in PII coding genes. Given that PII proteins act as conserved negative regulators of ACC in Bacteria, our findings may be explored to engineer other prokaryotes to improve fatty acid yields, thereby turning microbial biofuel production economically competitive in the future.
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