title: Tip-alpha (hp0596 gene product) is a highly immunogenic Helicobacter pylori protein involved in colonization of mouse gastric mucosa.
abstract: A product of the Helicobacter pylori hp0596 gene (Tip-alpha) is a highly immunogenic homodimeric protein, unique for this bacterium. Cell fractionation experiments indicate that Tip-alpha is anchored to the inner membrane. In contrast, the three-dimensional model of the protein suggests that Tip-alpha is soluble or, at least, largely exposed to the solvent. hp0596 gene knockout resulted in a significant decrease in the level of H. pylori colonization as measured by real-time PCR assay. In addition, the Tip-alpha recombinant protein was determined to stimulate macrophage to produce IL-1alpha and TNF-alpha. Both results imply that Tip-alpha is rather loosely connected to the inner membrane and potentially released during infection.
authors.affiliation: Department of Bacterial Genetics, Institute of Microbiology, University of Warsaw, ul. Miecznikowa 1, 02-096 Warsaw, Poland. renatag@biol.uw.edu.pl
authors.forename: Renata
authors.initials: R
authors.lastname: Godlewska
authors.forename: Marcin
authors.initials: M
authors.lastname: Pawlowski
authors.forename: Artur
authors.initials: A
authors.lastname: Dzwonek
authors.forename: Michal
authors.initials: M
authors.lastname: Mikula
authors.forename: Jerzy
authors.initials: J
authors.lastname: Ostrowski
authors.forename: Nadzieja
authors.initials: N
authors.lastname: Drela
authors.forename: Elzbieta K
authors.initials: EK
authors.lastname: Jagusztyn-Krynicka
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D005753:Gastric Mucosa / Q000382:microbiology*; D016481:Helicobacter Infections / Q000276:immunology / Q000382:microbiology*; D016480:Helicobacter pylori / Q000235:genetics / Q000378:metabolism / Q000472:pathogenicity*; D008262:Macrophage Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008958:Models, Molecular; D013047:Specific Pathogen-Free Organisms; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
chemical_list: D001426:Bacterial Proteins; C505332:Tipalpha protein, Helicobacter pylori; D014409:Tumor Necrosis Factor-alpha