Journal
FEMS MICROBIOLOGY LETTERS
Volume 184, Issue 2, Pages 193-198Publisher
ELSEVIER SCIENCE BV
DOI: 10.1111/j.1574-6968.2000.tb09013.x
Keywords
polyhydroxyalkanoate; (R)-specific enoyl-CoA hydratase; substrate specificity; Pseudomonas aeruginosa
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Two Pseudomonas aeruginosa genes, termed phaJ1(Pa) and phaJ2(Pa), homologous to the Aeromonas caviae (R)-specific enoyl-CoA hydratase gene (phaJ(Ac)) were cloned using a PCR technique to investigate the monomer-supplying ability for polyhydroxyalkanoate (PHA) synthesis from beta-oxidation cycle. Two expression plasmids for phaJ1(Pa) and phaJ1(Pa) were constructed and introduced into Escherichia toil DH5 alpha strain. The recombinants harboring phaJ1(Pa) or phaJ2(Pa) showed high (R)-specific enoyl-CoA hydratase activity with different substrate specificities. that is, specific for short chain-length enoyl-CoA or medium chain-length enoyl-CoA, respectively. In addition, co-expression of these two hydratase genes with PHA synthase gene in E. coli LS5218 resulted in the accumulation of PHA up to 14-29 wt% of cell dry weight from dodecanoate as a sole carbon source. It has been suggested that phaJ1(Pa) and phaJ2(Pa) products have the monomer-supplying ability for PHA synthesis from beta-oxidation cycle. (C) 1999 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
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