title: Opr86 is essential for viability and is a potential candidate for a protective antigen against biofilm formation by Pseudomonas aeruginosa.
abstract: Pseudomonas aeruginosa is an opportunistic bacterial pathogen that is one of the most refractory to therapy when it forms biofilms in the airways of cystic fibrosis patients. To date, studies regarding the production of an immunogenic and protective antigen to inhibit biofilm formation by P. aeruginosa have been superficial. The previously uncharacterized outer membrane protein (OMP) Opr86 (PA3648) of P. aeruginosa is a member of the Omp85 family, of which homologs have been found in all gram-negative bacteria. Here we verify the availability of Opr86 as a protective antigen to inhibit biofilm formation by P. aeruginosa PAO1 and several other isolates. A mutant was constructed in which Opr86 expression could be switched on or off through a tac promoter-controlled opr86 gene. The result, consistent with previous Omp85 studies, showed that Opr86 is essential for viability and plays a role in OMP assembly. Depletion of Opr86 resulted in streptococci-like morphological changes and liberation of excess membrane vesicles. A polyclonal antibody against Opr86 which showed reactivity to PAO1 cells was obtained. The antibody inhibited biofilm formation by PAO1 and the other clinical strains tested. Closer examination of early attachment revealed that cells treated with the antibody were unable to attach to the surface. Our data suggest that Opr86 is a critical OMP and a potential candidate as a protective antigen against biofilm formation by P. aeruginosa.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Tashiro
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Nomura
authors.forename: Ryoma
authors.initials: R
authors.lastname: Nakao
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Senpuku
authors.forename: Reiko
authors.initials: R
authors.lastname: Kariyama
authors.forename: Hiromi
authors.initials: H
authors.lastname: Kumon
authors.forename: Saori
authors.initials: S
authors.lastname: Kosono
authors.forename: Haruo
authors.initials: H
authors.lastname: Watanabe
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Nakajima
authors.forename: Hiroo
authors.initials: H
authors.lastname: Uchiyama
mesh_terms: D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000907:Antibodies, Bacterial / Q000276:immunology; D000942:Antigens, Bacterial / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000502:physiology*; D018441:Biofilms / Q000254:growth & development*; D002462:Cell Membrane / Q000502:physiology / Q000648:ultrastructure; D015964:Gene Expression Regulation, Bacterial / Q000502:physiology; D007074:Immunoglobulin G / Q000276:immunology; D008969:Molecular Sequence Data; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000235:genetics / Q000276:immunology / Q000502:physiology*
chemical_list: D000900:Anti-Bacterial Agents; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D007074:Immunoglobulin G