A microbial factory for lactate-based polyesters using a lactate-polymerizing enzyme
- 11 November 2008
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 105 (45), 17323-17327
- https://doi.org/10.1073/pnas.0805653105
Abstract
Polylactate (PLA) is synthesized as a representative bio-based polyester by the chemo-bio process on the basis of metal catalyst-mediated chemical polymerization of lactate (LA) supplied by microbial fermentation. To establish the one-step microbial process for synthesis of LA-based polyesters, we explored whether polyhydroxyalkanoate (PHA) synthase would exhibit polymerizing activity toward a LA-coenzyme A (CoA), based on the fact that PHA monomeric constituents, especially 3-hydroxybutyrate (3HB), are structurally analogous to LA. An engineered PHA synthase was discovered as a candidate by a two-phase in vitro polymerization system previously developed. An LA-CoA producing Escherichia coli strain with a CoA transferase gene was constructed, and the generation of LA-CoA was demonstrated by capillary electrophoresis/MS analysis. Next, when the engineered PHA synthase gene was introduced into the resultant recombinant strain, we confirmed the one-step biosynthesis of the LA-incorporated copolyester, P(6 mol% LA-co-94 mol% 3HB), with a number-average molecular weight of 1.9 x 10(5), as revealed by gel permeation chromatography, gas chromatography/MS, and NMR.Keywords
This publication has 21 references indexed in Scilit:
- An Overview of Polylactides as Packaging MaterialsMacromolecular Bioscience, 2004
- Chemoenzymatic Synthesis of Poly(3-hydroxybutyrate) in a Water-Organic Solvent Two-Phase SystemMacromolecules, 2004
- Evolution of Polyhydroxyalkanoate (PHA) Production System by “Enzyme Evolution”: Successful Case Studies of Directed EvolutionMacromolecular Bioscience, 2004
- Polyester synthases: natural catalysts for plasticsBiochemical Journal, 2003
- Polyhydroxyalkanoate (PHA) homeostasis: the role of the PHA synthaseNatural Product Reports, 2003
- Enzyme-Catalyzed Poly(3-Hydroxybutyrate) Synthesis from Acetate with CoA Recycling and NADPH Regeneration in VitroJournal of Bioscience and Bioengineering, 2003
- Synthesis of a Novel Class of Polyhydroxyalkanoates in Arabidopsis Peroxisomes, and Their Use in Monitoring Short-Chain-Length Intermediates of β-OxidationPlant and Cell Physiology, 2002
- Biosynthesis of Poly(3-hydroxybutyrate-co-3-hydroxyalkanoates) Copolymer from Sugars by Recombinant Ralstonia eutropha Harboring the phaC1Ps and the phaGPs Genes of Pseudomonas sp. 61-3Biomacromolecules, 2001
- Physical properties and enzymatic degradability of copolymers of (R)-3-hydroxybutyric acid and (S,S)-lactidePolymer, 1998
- Improved M13 phage cloning vectors and host strains: nucleotide sequences of the M13mpl8 and pUC19 vectorsGene, 1985