The second PHA synthesis pathway (pathway II) is related to fatty acid
uptake by microorganisms. After fatty acid b-oxidation, acyl-CoA enters the PHA
monomer synthesis process. Enzymes including 3-ketoacyl-CoA reductase,
epimerase, (R)-enoyl-CoA hydratase/enoyl-CoA hydratase I, acyl-CoA oxidase
(putative), and enoyl-CoA hydratase I (putative) were found to be involved in
supplying the PHA precursor 3-hydroxyacyl-CoA for PHA synthesis. Pseudomonas
putida, Pesudomonas aeruginosa, and A. hydrophila are able to use pathway II to
synthesize medium-chain-length (mcl) PHA or copolymers of (R)-3-hydroxybutyrate
(R3HB) and (R)-3-hydroxyhexanoate (PHBHHx).
The second PHA synthesis pathway (pathway II) is related to fatty aciduptake by microorganisms. After fatty acid b-oxidation, acyl-CoA enters the PHAmonomer synthesis process. Enzymes including 3-ketoacyl-CoA reductase,epimerase, (R)-enoyl-CoA hydratase/enoyl-CoA hydratase I, acyl-CoA oxidase(putative), and enoyl-CoA hydratase I (putative) were found to be involved insupplying the PHA precursor 3-hydroxyacyl-CoA for PHA synthesis. Pseudomonasputida, Pesudomonas aeruginosa, and A. hydrophila are able to use pathway II tosynthesize medium-chain-length (mcl) PHA or copolymers of (R)-3-hydroxybutyrate(R3HB) and (R)-3-hydroxyhexanoate (PHBHHx).
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