title: Metabolic engineering of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) composition in recombinant Salmonella enterica serovar typhimurium.
abstract: A recombinant strain of Salmonella enterica serovar Typhimurium (mutant in propionate-activation activity) was metabolically engineered to control the composition of poly(3-hydroxybutyrate-co-3-hydroxy- valerate) (PHBV), a polyhydroxyalkanoate copolymer with commercially desirable properties. A gene (prpE) encoding propionyl-CoA synthetase was placed under the control of the IPTG-inducible taclacUV5 promoter (P(taclacUV5)) while the polyhydroxyalkanoate synthesis operon (phaBCA) from Acinetobacter sp. RA3849 was coexpressed under the control of the arabinose-inducible araBAD promoter (P(BAD)). S. enterica, harboring both constructs, was grown in medium containing a fixed substrate concentration and the composition of the copolymer was varied between 2 mol% and 25 mol% 3-hydroxyvalerate by controlling the IPTG level in the medium. This "dial-a-composition" system should find application in cases where the substrate concentration of a feedstream for PHBV bioplastic production is not adjustable.
authors.affiliation: Department of Chemical Engineering, University of California, Berkeley, 94720-1462, USA.
authors.forename: I
authors.initials: I
authors.lastname: Aldor
authors.forename: J D
authors.initials: JD
authors.lastname: Keasling
mesh_terms: D000150:Acinetobacter / Q000235:genetics / Q000378:metabolism; D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D003001:Cloning, Molecular; D003066:Coenzyme A Ligases / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D005822:Genetic Vectors; D009154:Mutation; D009876:Operon; D010957:Plasmids; D011091:Polyesters / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D019779:Salmonella enterica / Q000235:genetics / Q000378:metabolism*; D013997:Time Factors; D014170:Transformation, Genetic; D000094122:Polyhydroxybutyrates
chemical_list: D000217:Acyltransferases; D003066:Coenzyme A Ligases; D011091:Polyesters; D011994:Recombinant Proteins; C052620:poly(3-hydroxybutyrate)-co-(3-hydroxyvalerate); D000094122:Polyhydroxybutyrates; C077225:poly(3-hydroxyalkanoic acid) synthase; C068072:propionate - CoA ligase