title: Crystal structure of CagZ, a protein from the Helicobacter pylori pathogenicity island that encodes for a type IV secretion system.
abstract: CagZ, a 23 kDa protein encoded by the cagZ gene (HP0526) of the cag pathogenicity island of Helicobacter pylori, has been cloned, over-expressed, purified and its three-dimensional structure determined. The protein consists of a single compact L-shaped domain, composed of seven alpha-helices including about 70% of the total residues. Three-dimensional homology searches did not reveal structural homologues, and CagZ can be considered representative of a new protein fold. The presence of a disordered C-terminal tail and the nature of the molecular surface suggest that CagZ may participate in the interaction of effector proteins with one or more components of the H.pylori type IV secretion system on the cytoplasmic side of the inner membrane.
authors.affiliation: Dipartmento di Scienze Chimiche, Istituto de Chimica Biomoleculare del CNR, Università di Padova, Padua, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Cendron
authors.forename: Anke
authors.initials: A
authors.lastname: Seydel
authors.forename: Alessandro
authors.initials: A
authors.lastname: Angelini
authors.forename: Roberto
authors.initials: R
authors.lastname: Battistutta
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Zanotti
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D003001:Cloning, Molecular; D018360:Crystallography, X-Ray; D016480:Helicobacter pylori / Q000737:chemistry* / Q000472:pathogenicity*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D055672:Static Electricity
chemical_list: D001426:Bacterial Proteins