title: Cryptic dehalogenase and chloroamidase genes in Pseudomonas putida and the influence of environmental conditions on their expression.
abstract: Mutants of two strains of Pseudomonas putida expressed two cryptic chloroamidases (C-amidase and H-amidase) and one cryptic dehalogenase (DehII). The mutants were selected on either 2-chloropropionamide (2CPA) or 2-monochloropropionate (2MCPA), developing as papillae in parental colonies growing on a metabolisable support substrate. Mutants expressing C-amidase were selected if 2CPA was utilised as either a carbon or a nitrogen source. H-amidase mutants were selected only if 2CPA was used as a nitrogen source. Growth temperature and pH affected the frequency of papillae production, although different temperatures and pHs did not affect the overall growth characteristics of the parental colonies. Decreasing growth temperature increased the frequency of 2cpa+ papillae formation, but decreased the frequency of 2mcpa+ papillae formation. Low pH (6.0) prevented the formation of 2mcpa+ and 2cpa+ papillae. However, in the case of the 2cpa+ papillae, decreasing the growth temperature also allowed papillae formation at pH 6.0.
authors.affiliation: Molecular Ecology Research Unit, School of Pure and Applied Biology, University of Wales, Cardiff, UK.
authors.forename: S J
authors.initials: SJ
authors.lastname: Hope
authors.forename: J H
authors.initials: JH
authors.lastname: Slater
mesh_terms: D000081:Acetamides / Q000378:metabolism; D000577:Amides / Q000378:metabolism; D000581:Amidohydrolases / Q000235:genetics* / Q000378:metabolism; D002455:Cell Division; D003470:Culture Media; D015870:Gene Expression; D005798:Genes, Bacterial; D006843:Hydrocarbons, Chlorinated; D006863:Hydrogen-Ion Concentration; D006867:Hydrolases / Q000235:genetics* / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D011422:Propionates / Q000378:metabolism; D016958:Pseudomonas putida / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D013379:Substrate Specificity; D013696:Temperature
chemical_list: D000081:Acetamides; D000577:Amides; D003470:Culture Media; D006843:Hydrocarbons, Chlorinated; D011422:Propionates; C092911:2-chloropropionamide; C013874:chloroacetamide; C021974:2-chloropropionic acid; D006867:Hydrolases; D000581:Amidohydrolases; C034507:2-haloacid dehalogenase