title: The Caulobacter crescentus outer membrane protein Omp58 (RsaF) is not required for paracrystalline S-layer secretion.
abstract: To identify the outer membrane protein component of the Caulobacter crescentus CB2 surface-layer export machinery we used the Serratia marcescens LipD protein to find homologs in the CB2 genome. From two homologous sequences found, one encodes a putative OMP with a predicted molecular mass of 57.5 kDa, termed Omp58 (formerly RsaF). Comparison of membrane protein profiles revealed a protein with an appropriate molecular mass present in wild-type, but not CB2 omp58::kanamycin, a mutant strain with an inactivated omp58 gene. Disruption of omp58 did not affect surface-layer production, suggesting that Omp58 is not involved in surface-layer protein secretion and, thus, may not be the outer membrane protein component of the C. crescentus surface-layer export system.
authors.affiliation: Chirurgische Forschung, Chirurgische Universitätsklinik, Hugstetter Strasse 55, D-79106 i. Br., Freiburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Reichelt
authors.forename: B U
authors.initials: BU
authors.lastname: von Specht
authors.forename: H P
authors.initials: HP
authors.lastname: Hahn
mesh_terms: D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics; D015153:Blotting, Western; D016935:Caulobacter crescentus / Q000235:genetics / Q000378:metabolism*; D003001:Cloning, Molecular; D004591:Electrophoresis, Polyacrylamide Gel; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009154:Mutation; D021382:Protein Sorting Signals; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D020539:Sequence Analysis, Protein; D017385:Sequence Homology; D012706:Serratia marcescens / Q000737:chemistry / Q000235:genetics
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; C096742:LipD protein, Serratia marcescens; D008562:Membrane Glycoproteins; D026901:Membrane Transport Proteins; D021382:Protein Sorting Signals; D011993:Recombinant Fusion Proteins; C055764:S-layer proteins