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Genetic Characterization of the Poly(hydroxyalkanoate) Synthases of Various Pseudomonas oleovorans Strains

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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 α/β-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.

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Acknowledgment

The technical assistance of Nicole Cross and Marshall Reed is acknowledged.

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Authors and Affiliations

  1. 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

    Daniel K.Y. Solaiman & Richard D. Ashby

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  1. Daniel K.Y. Solaiman
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  2. Richard D. Ashby
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Correspondence to Daniel K.Y. Solaiman.

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Solaiman, D.K., Ashby, R.D. Genetic Characterization of the Poly(hydroxyalkanoate) Synthases of Various Pseudomonas oleovorans Strains. Curr Microbiol 50, 329–333 (2005). https://doi.org/10.1007/s00284-005-4508-7

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  • DOI: https://doi.org/10.1007/s00284-005-4508-7

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