title: Cloning and characterization of Planctomyces limnophilus rpoN: complementation of a Salmonella typhimurium rpoN mutant strain.
abstract: The rpoN gene, which encodes the alternative sigma factor sigma 54, was cloned from the budding, peptidoglycan-less bacterium Planctomyces limnophilus. P. limnophilus rpoN complemented the Ntr- phenotype of a Salmonella typhimurium rpoN mutant strain. The P. limnophilus rpoN gene encoded a predicted polypeptide that was 495 residues in length and shared a significant homology with other members of the sigma 54 family. The protein sequence displayed all of the characteristic motifs found in members of this family, including the C-terminal helix-turn-helix motif and the well-conserved RpoN box. A potential sigma 54-dependent activator was also identified in P. limnophilus. These findings extend the range of phylogenetic groups within the Domain Bacteria that are known to contain sigma 54.
authors.affiliation: Department of Microbiology, University of Georgia, Athens 30602, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Leary
authors.forename: N
authors.initials: N
authors.lastname: Ward-Rainey
authors.forename: T R
authors.initials: TR
authors.lastname: Hoover
mesh_terms: D000595:Amino Acid Sequence; D001419:Bacteria / Q000737:chemistry / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004268:DNA-Binding Proteins; D012321:DNA-Directed RNA Polymerases / Q000235:genetics*; D005816:Genetic Complementation Test; D006090:Gram-Negative Bacteria / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D051877:RNA Polymerase Sigma 54; D012486:Salmonella typhimurium / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012808:Sigma Factor / Q000235:genetics* / Q000502:physiology; D015534:Trans-Activators / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D012808:Sigma Factor; D015534:Trans-Activators; D012321:DNA-Directed RNA Polymerases; D051877:RNA Polymerase Sigma 54