Engineering Escherichia coli for production of C₁₂-C₁₄ polyhydroxyalkanoate from glucose.

Engineering Escherichia coli for production of C₁₂-C₁₄ polyhydroxyalkanoate from glucose.
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DOI:
10.1016/j.ymben.2012.08.003
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发表时间:
2012-11
影响因子:
8.4
通讯作者:
Pfleger, Brian F.
Pfleger, Brian F.
中科院分区:
工程技术1区
文献类型:
--
作者:
Agnew, Daniel E.;Stevermer, Amanda K.;Youngquist, J. Tyler;Pfleger, Brian F.

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Demand for sustainable materials motivates the development of microorganisms capable of synthesizing products from renewable substrates. A challenge to commercial production of polyhydroxyalkanoates (PHA), microbially derived polyesters, is engineering metabolic pathways to produce a polymer with the desired monomer composition from an unrelated and renewable source. Here, we demonstrate a metabolic pathway for converting glucose into medium-chain-length (mcl)-PHA composed primarily of 3-hydroxydodecanoate monomers. This pathway combines fatty acid biosynthesis, an acyl-ACP thioesterase to generate desired C12 and C14 fatty acids, β-oxidation for conversion of fatty acids to (R)-3-hydroxyacyl-CoAs, and a PHA polymerase. A key finding is that Escherichia coli expresses multiple copies of enzymes involved in β-oxidation under aerobic conditions. To produce polyhydroxydodecanoate, an acyl-ACP thioesterase (BTE), an enoyl-CoA hydratase (phaJ3), and mcl-PHA polymerase (phaC2) were overexpressed in E. coli ΔfadRABIJ. Yields were improved through expression of an acyl-CoA synthetase resulting in production over 15% CDW – the highest reported production of mcl-PHA of a defined composition from an unrelated carbon source.
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