title: Genetic characterization of the poly(hydroxyalkanoate) synthases of various Pseudomonas oleovorans strains.
abstract: We identified the poly(hydroxyalkanoate) synthase (PHAS) genes of three strains of Pseudomonas oleovorans by using polymerase chain reaction (PCR)-based detection methods. P. oleovorans NRRL B-14682 contains Class I PHA synthase gene (phaC), NRRL B-14683 harbors Class II phaC1 and phaC2 genes, and NRRL B-778 contain both the Class I and II PHA synthase genes. Inverse-PCR and chromosomal walking techniques were employed to obtain the complete sequences of the Class I phaCs of NRRL B-778 (phbC778; 1698 bps) and B-14682 (phbC14682; 1899 bps). BLAST search indicated that these genes are new and had not been previously cloned. The gene product of phbC778 (i.e., PhbC778; 566 amino acid residues) is homologous to the Class I PHA synthases of Pseudomonas sp. HJ-2 and Pseudomonas sp. strain 61-3, and that of phbC14682 (PhbC14682; 632 amino acids) is homologous to PHAS of Delftia acidovorans. The PhbC14682 contains an extra sequence of 33 amino acids in its conserved alpha/beta-hydrolase domain, making it only the second Class I PHA synthase found to contain this cellular proteolytic sequence. Consistent with their Pseudomonas origin, the codon-usage profiles of PhbC778 and PhbC14682 are similar to those of Pseudomonas Class II PHASs. These new Pseudomonas Class I phbC genes provide valuable addition to the gene pool for the construction of novel PHASs through gene shuffling.
authors.affiliation: Fats, Oils and Animal Coproducts Research Unit, Eastern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, PA, 19038, USA. dsolaiman@errc.ars.usda.gov
authors.forename: Daniel K Y
authors.initials: DK
authors.lastname: Solaiman
authors.forename: Richard D
authors.initials: RD
authors.lastname: Ashby
mesh_terms: D000217:Acyltransferases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D008969:Molecular Sequence Data; D011091:Polyesters / Q000378:metabolism; D016133:Polymerase Chain Reaction; D044204:Pseudomonas oleovorans / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D011091:Polyesters; D000217:Acyltransferases; C077225:poly(3-hydroxyalkanoic acid) synthase