title: Non-conventional yeasts as producers of polyhydroxyalkanoates--genetic engineering of Arxula adeninivorans.
abstract: The non-conventional yeast Arxula adeninivorans was equipped with the genes phbA, phbB and phbC of the polyhydroxyalkanoate (PHA) biosynthetic pathway of Ralstonia eutropha, which encode beta-ketothiolase, NADPH-linked acetoacetyl-CoA reductase and PHA synthase, respectively. Arxula strains transformed solely with the PHA synthase gene (phbC) were able to produce PHA. However, the maximum content of the polymer detected in these strains was just 0.003% poly-3-hydroxybutyrate (PHB) and 0.112% poly-3-hydroxyvalerate (PHV). The expression of all three genes (phbA, phbB, phbC) resulted in small increases in the PHA content of the transgenic Arxula cells. However, under controlled cultivation conditions with minimal medium and ethanol as the carbon source, the recombinant yeast was able to accumulate up to 2.2% PHV and 0.019% PHB. Possible reasons for these differences are discussed.
authors.affiliation: Institute of Plant Genetics and Crop Plant Research, Corrensstrasse 3, 06466 Gatersleben, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Terentiev
authors.forename: U
authors.initials: U
authors.lastname: Breuer
authors.forename: W
authors.initials: W
authors.lastname: Babel
authors.forename: G
authors.initials: G
authors.lastname: Kunze
mesh_terms: D000102:Acetyl-CoA C-Acyltransferase / Q000235:genetics / Q000502:physiology; D000217:Acyltransferases / Q000235:genetics / Q000502:physiology; D000429:Alcohol Oxidoreductases / Q000235:genetics / Q000502:physiology; D003001:Cloning, Molecular; D003470:Culture Media; D020118:Cupriavidus necator / Q000201:enzymology / Q000235:genetics; D000431:Ethanol / Q000378:metabolism; D005798:Genes, Bacterial; D005818:Genetic Engineering; D005822:Genetic Vectors; D006885:Hydroxybutyrates / Q000378:metabolism; D007700:Kinetics; D010957:Plasmids / Q000235:genetics; D011091:Polyesters / Q000378:metabolism*; D004718:Saccharomycetales / Q000235:genetics* / Q000378:metabolism*; D014170:Transformation, Genetic; D014631:Valerates / Q000378:metabolism; D015003:Yeasts / Q000235:genetics / Q000378:metabolism; D000094122:Polyhydroxybutyrates
chemical_list: D000102:Acetyl-CoA C-Acyltransferase; D000217:Acyltransferases; D000429:Alcohol Oxidoreductases; D003470:Culture Media; D000431:Ethanol; D006885:Hydroxybutyrates; D011091:Polyesters; D014631:Valerates; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates; C073314:poly(3-hydroxyvalerate); C023744:acetoacetyl-CoA reductase; C077225:poly(3-hydroxyalkanoic acid) synthase