title: Expression, purification, crystallization and preliminary X-ray studies of the outer membrane efflux proteins OprM and OprN from Pseudomonas aeruginosa.
abstract: OprM and OprN belong to the outer membrane factor family proteins. These approximately 52 kDa proteins are part of the tripartite efflux pumps found in Pseudomonas aeruginosa and are responsible in part for the antibiotic resistance observed in these bacteria. Both proteins have been expressed in Escherichia coli as His-tag proteins and purified accordingly by affinity chromatography in the presence of n-octyl-beta-D-glucopyranoside detergent. OprM and OprN were crystallized using PEG 20 000/ammonium citrate and ammonium sulfate as precipitating agents, respectively. Crystals belong to space group C2, with unit-cell parameters a = 152.6, b = 87.9, c = 355.9 A, beta = 98.9 degrees and a = 151.3, b = 87.6, c = 356.5 A, beta = 98.1 degrees for OprM and OprN, respectively. Using the ESRF synchrotron-radiation source, OprM diffraction data extended to 3.4 A.
authors.affiliation: Laboratoire de Cristallographie et RMN Biologiques, UMR 8015 CNRS, Faculté de Pharmacie, Université René Descartes, 4 Avenue de l'Observatoire, 75270 Paris Cedex 06, France. isabelle.broutin@univ-paris5.fr
authors.forename: Isabelle
authors.initials: I
authors.lastname: Broutin
authors.forename: Houssain
authors.initials: H
authors.lastname: Benabdelhak
authors.forename: Xavier
authors.initials: X
authors.lastname: Moreel
authors.forename: Marie-Bernard
authors.initials: MB
authors.lastname: Lascombe
authors.forename: Dimitri
authors.initials: D
authors.lastname: Lerouge
authors.forename: Arnaud
authors.initials: A
authors.lastname: Ducruix
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification; D001483:Base Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D017931:DNA Primers; D026901:Membrane Transport Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification; D008954:Models, Biological; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011550:Pseudomonas aeruginosa / Q000737:chemistry*; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D001425:Bacterial Outer Membrane Proteins; D017931:DNA Primers; D026901:Membrane Transport Proteins; C402263:OprM protein, Pseudomonas aeruginosa; C105708:OprN protein, Pseudomonas aeruginosa; D011994:Recombinant Proteins