4hhx

Structure of cytoplasmic domain of TCPE from Vibrio cholerae

spinqualitylabelsall models 4hhx, resolution 1.88Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4hhx is a 1 chain structure with sequence from Vibrio cholerae o1 biovar el tor str. n16961. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 NonStd Res: MSE Related: 4hji Gene: tcpE, VC_0836 (Vibrio cholerae O1 biovar El Tor str. N16961) Resources: FirstGlance, OCA, RCSB, PDBsum Function [TCPE_VIBCH] Probably involved in cholera toxin receptor (GM1) interaction in order to bring the cells within close proximity of the ganglioside for efficient toxin delivery. Publication Abstract from PubMed Type IV pili are long thin surface-displayed polymers of the pilin subunit that are present in a diverse group of bacteria. These multifunctional filaments are critical to virulence for pathogens such as Vibrio cholerae, which use them to form microcolonies and to secrete the colonization factor TcpF. The type IV pili are assembled from pilin subunits by a complex inner membrane machinery. The core component of the type IV pilus-assembly platform is an integral inner membrane protein belonging to the GspF superfamily of secretion proteins. These proteins somehow convert chemical energy from ATP hydrolysis by an assembly ATPase on the cytoplasmic side of the inner membrane to mechanical energy for extrusion of the growing pilus filament out of the inner membrane. Most GspF-family inner membrane core proteins are predicted to have N-terminal and central cytoplasmic domains, cyto1 and cyto2, and three transmembrane segments, TM1, TM2 and TM3. Cyto2 and TM3 represent an internal repeat of cyto1 and TM1. Here, the 1.88 A resolution crystal structure of the cyto1 domain of V. cholerae TcpE, which is required for assembly of the toxin-coregulated pilus, is reported. This domain folds as a monomeric six-helix bundle with a positively charged membrane-interaction face at one end and a hydrophobic groove at the other end that may serve as a binding site for partner proteins in the pilus-assembly complex. Structure of the cytoplasmic domain of TcpE, the inner membrane core protein required for assembly of the Vibrio cholerae toxin-coregulated pilus.,Kolappan S, Craig L Acta Crystallogr D Biol Crystallogr. 2013 Apr;69(Pt 4):513-9. doi:, 10.1107/S0907444912050330. Epub 2013 Mar 9. PMID:23519659 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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