title: In vitro synthesis of poly(3-hydroxybutyric acid) by using an enzymatic coenzyme A recycling system.
abstract: Purified recombinant poly(hydroxyalkanoic acid), PHA, synthase from Chromatium vinosum was used to examine in vitro poly(3-hydroxybutyric acid) (P(3HB)) formation. In combination with purified propionyl-coenzyme A transferase of Clostridium propionicum a two-enzyme in vitro P(3HB) biosynthesis system was established which allowed the synthesis of P(3HB) from free D-(-)-3-hydroxybutyric acid as substrate. The coenzyme A residue for the activation of this hydroxyacid was provided by acetyl-coenzyme A. By adding acetyl-coenzyme A synthetase to this system, a three-enzyme in vitro P(3HB) biosynthesis system was established. Coenzyme A that was released during the polymerization reaction was coupled to acetate which again served as the coenzyme A donor for the activation of 3-hydroxybutyric acid. The energy for the in vitro P(3HB) synthesis was provided by ATP hydrolyses resulting in acetyl-coenzyme A synthesis catalyzed by the acetyl coenzyme A synthetase. In this way the in vitro synthesis of P(3HB) became independent of the consumption of the expensive coenzyme A. By this procedure a handy system is available to produce in vitro PHA on a semipreparative scale.
authors.affiliation: Institut für Mikrobiologie, Westfälische Wilhelms-Universität Münster, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Jossek
authors.forename: A
authors.initials: A
authors.lastname: Steinbüchel
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000378:metabolism*; D000106:Acetate-CoA Ligase / Q000378:metabolism*; D000217:Acyltransferases / Q000378:metabolism; D002844:Chromatium / Q000201:enzymology*; D003013:Clostridium / Q000201:enzymology* / Q000254:growth & development; D003065:Coenzyme A / Q000378:metabolism; D015256:Coenzyme A-Transferases / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000254:growth & development; D011994:Recombinant Proteins / Q000378:metabolism
chemical_list: D011994:Recombinant Proteins; D000217:Acyltransferases; C077225:poly(3-hydroxyalkanoic acid) synthase; D015256:Coenzyme A-Transferases; C031212:acyl-CoA transferase; D000106:Acetate-CoA Ligase; D003065:Coenzyme A; D020155:3-Hydroxybutyric Acid