title: Global proteomic pattern of Tropheryma whipplei: a Whipple's disease bacterium.
abstract: The proteome of Tropheryma whipplei, the intracellular bacterium responsible for Whipple's disease (WD), was analyzed using two complementary approaches: 2-DE coupled with MALDI-TOF and SDS-PAGE with nanoLC-MS/MS. This strategy led to the identification of 206 proteins of 808 predicted ORFs, resolving some questions raised by the genomic sequence of this bacterium. We successfully identified antibiotic targets and proteins with predicted N-terminal signal sequences. Additionally, we identified a family of surface proteins (known as T. whipplei surface proteins (WiSPs)), which are encoded by a unique group of species-specific genes and serve as both coding regions and DNA repeats that promote genomic recombination. Comparison of the protein expression profiles of the intracellular facultative host-associated WD bacterium with other host-associated, intracellular obligate, and environmental bacteria revealed that T. whipplei shares a proteomic expression profile with other host-associated facultative intracellular bacteria. In summary, this study describes the global protein expression pattern of T. whipplei and reveals some specific features of the T. whipplei proteome.
authors.affiliation: Unité des Rickettsies, CNRS URMITE 6236 IRD, IFR 48, Faculté de Médecine, Marseille, France.
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Kowalczewska
authors.forename: Claude
authors.initials: C
authors.lastname: Villard
authors.forename: Daniel
authors.initials: D
authors.lastname: Lafitte
authors.forename: Florence
authors.initials: F
authors.lastname: Fenollar
authors.forename: Didier
authors.initials: D
authors.lastname: Raoult
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000032:analysis / Q000737:chemistry; D002853:Chromatography, Liquid; D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D016680:Genome, Bacterial; D006801:Humans; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D036103:Nanotechnology; D040901:Proteomics / Q000379:methods*; D054851:Tropheryma / Q000235:genetics / Q000378:metabolism*; D008061:Whipple Disease / Q000382:microbiology*
chemical_list: D001426:Bacterial Proteins