title: Membrane topology of the outer membrane protein OprH from Pseudomonas aeruginosa: PCR-mediated site-directed insertion and deletion mutagenesis.
abstract: The 21-kDa outer membrane protein OprH from Pseudomonas aeruginosa is overexpressed under Mg2+ starvation conditions and when overproduced causes resistance to polymyxin B, gentamicin, and EDTA. By circular dichroism analysis, OprH revealed a calculated beta-sheet structure content of 47.3%. PCR-based site-directed deletion and epitope insertion mutagenesis was used to test a topological model of OprH as an eight-stranded beta-barrel. Three permissive and seven nonpermissive malarial epitope insertion mutants and four permissive and four nonpermissive deletion mutants confirmed the general accuracy of this model. Thus, OprH is the smallest outer membrane protein to date to be confirmed as a beta-stranded protein.
authors.affiliation: Department of Microbiology and Immunology, University of British Columbia, Vancouver, Canada.
authors.forename: B H
authors.initials: BH
authors.lastname: Rehm
authors.forename: R E
authors.initials: RE
authors.lastname: Hancock
mesh_terms: D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis / Q000737:chemistry*; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D016133:Polymerase Chain Reaction; D017510:Protein Folding; D011550:Pseudomonas aeruginosa / Q000737:chemistry*; D013329:Structure-Activity Relationship
chemical_list: D001425:Bacterial Outer Membrane Proteins