title: The nucleotide sequence of the Pseudomonas aeruginosa pyrE-crc-rph region and the purification of the crc gene product.
abstract: The gene (crc) responsible for catabolite repression control in Pseudomonas aeruginosa has been cloned and sequenced. Flanking the crc gene are genes encoding orotate phosphoribosyl transferase (pyrE) and RNase PH (rph). New crc mutants were constructed by disruption of the wild-type crc gene. The crc gene encodes an open reading frame of 259 amino acids with homology to the apurinic/apyrimidinic endonuclease family of DNA repair enzymes. However, crc mutants do not have a DNA repair phenotype, nor can the crc gene complement Escherichia coli DNA repair-deficient strains. The crc gene product was overexpressed in both P. aeruginosa and in E. coli, and the Crc protein was purified from both. The purified Crc proteins show neither apurinic/apyrimidinic endonuclease nor exonuclease activity. Antibody to the purified Crc protein reacted with proteins of similar size in crude extracts from Pseudomonas putida and Pseudomonas fluorescens, suggesting a common mechanism of catabolite repression in these three species.
authors.affiliation: Department of Microbiology and Immunology, East Carolina University School of Medicine, Greenville, North Carolina 27858, USA.
authors.forename: C H
authors.initials: CH
authors.lastname: MacGregor
authors.forename: S K
authors.initials: SK
authors.lastname: Arora
authors.forename: P W
authors.initials: PW
authors.lastname: Hager
authors.forename: M B
authors.initials: MB
authors.lastname: Dail
authors.forename: P V
authors.initials: PV
authors.lastname: Phibbs
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics; D001483:Base Sequence; D003429:Cross Reactions; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase; D043223:Deoxyribonuclease IV (Phage T4-Induced); D004794:Enzyme Repression; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D005095:Exoribonucleases / Q000235:genetics*; D005798:Genes, Bacterial; D008190:Lyases / Q000235:genetics; D008969:Molecular Sequence Data; D009962:Orotate Phosphoribosyltransferase / Q000235:genetics*; D011550:Pseudomonas aeruginosa / Q000235:genetics*; D011994:Recombinant Proteins / Q000302:isolation & purification; D012097:Repressor Proteins / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D011994:Recombinant Proteins; D012097:Repressor Proteins; C101896:crc protein, Pseudomonas; D009962:Orotate Phosphoribosyltransferase; C056502:ribonuclease PH; D005095:Exoribonucleases; D043223:Deoxyribonuclease IV (Phage T4-Induced); C468972:endonuclease IV, E coli; D008190:Lyases; D043603:DNA-(Apurinic or Apyrimidinic Site) Lyase