title: Development of a new strategy for production of medium-chain-length polyhydroxyalkanoates by recombinant Escherichia coli via inexpensive non-fatty acid feedstocks.
abstract: Pseudomonas putida KT2440 is capable of producing medium-chain-length polyhydroxyalkanoates (MCL-PHAs) when grown on unrelated carbon sources during nutrient limitation. Transcription levels of genes putatively involved in PHA biosynthesis were assessed by quantitative real-time PCR (qRT-PCR) in P. putida grown on glycerol as a sole carbon source. The results showed that two genes, phaG and the PP0763 gene, were highly upregulated among genes potentially involved in the biosynthesis of MCL-PHAs from unrelated carbon sources. Previous studies have described phaG as a 3-hydroxyacyl-acyl carrier protein (ACP)-coenzyme A (CoA) transferase, and based on homology, the PP0763 gene was predicted to encode a medium-chain-fatty-acid CoA ligase. High expression levels of these genes during PHA production in P. putida led to the hypothesis that these two genes are involved in PHA biosynthesis from non-fatty acid carbon sources, such as glucose and glycerol. The phaG(pp) and PP0763 genes from P. putida were cloned and coexpressed with the engineered Pseudomonas sp. 61-3 PHA synthase gene phaCl (STQK)(ps) in recombinant Escherichia coli. Up to 400 mg liter(-1) MCL-PHAs was successfully produced from glucose. This study has produced the largest amount of MCL-PHAs reported from non-fatty acid carbon sources in recombinant E. coli to date and opens up the possibility of using inexpensive feedstocks to produce MCL-PHA polymers.
authors.affiliation: Department of Chemistry, State University of New York-College of Environmental Science and Forestry, Syracuse, New York, USA.
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.forename: Ryan C
authors.initials: RC
authors.lastname: Tappel
authors.forename: Chengjun
authors.initials: C
authors.lastname: Zhu
authors.forename: Christopher T
authors.initials: CT
authors.lastname: Nomura
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D020869:Gene Expression Profiling; D005947:Glucose / Q000378:metabolism*; D054813:Polyhydroxyalkanoates / Q000096:biosynthesis*; D011549:Pseudomonas / Q000201:enzymology / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D054813:Polyhydroxyalkanoates; D011994:Recombinant Proteins; D005947:Glucose
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