2o6c | pdb_00002o6c

Structure of selenomethionyl rTp34 from Treponema pallidum

spinqualitylabelsall models 2o6c, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2o6c is a 2 chain structure with sequence from "microspironema_pallidum"_(schaudinn_and_hoffmann_1905)_stiles_and_pfender_1905 "microspironema pallidum" (schaudinn and hoffmann 1905) stiles and pfender 1905. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, EDO, SO4 NonStd Res: MSE Related: 2o6d, 2o6e, 2o6f Gene: tpd ("Microspironema pallidum" (Schaudinn and Hoffmann 1905) Stiles and Pfender 1905) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [TA34_TREPA] This antigen is a pathogen-specific membrane immunogen. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The Tp34 (TP0971) membrane lipoprotein of Treponema pallidum, an obligate human pathogen and the agent of syphilis, was previously reported to have lactoferrin binding properties. Given the non-cultivatable nature of T. pallidum, a structure-to-function approach was pursued to clarify further potential relationships between the Tp34 structural and biochemical properties and its propensity to bind human lactoferrin. The crystal structure of a nonacylated, recombinant form of Tp34 (rTp34), solved to a resolution of 1.9A(,) revealed two metaloccupied binding sites within a dimer; the identity of the ion most likely was zinc. Residues from both of the monomers contributed to the interfacial metal-binding sites; a novel feature was that the delta-sulfur of methionine coordinated the zinc ion. Analytical ultracentrifugation showed that, in solution, rTp34 formed a metal-stabilized dimer and that rTp34 bound human lactoferrin with a stoichiometry of 2:1. Isothermal titration calorimetry further revealed that rTp34 bound human lactoferrin at high (submicromolar) affinity. Finally, membrane topology studies revealed that native Tp34 is not located on the outer surface (outer membrane) of T. pallidum but, rather, is periplasmic. How propensity of Tp34 to bind zinc and the iron-sequestering lactoferrin may relate overall to the biology of T. pallidum infection in humans is discussed. Crystal structure of the Tp34 (TP0971) lipoprotein of treponema pallidum: implications of its metal-bound state and affinity for human lactoferrin.,Deka RK, Brautigam CA, Tomson FL, Lumpkins SB, Tomchick DR, Machius M, Norgard MV J Biol Chem. 2007 Feb 23;282(8):5944-58. Epub 2006 Dec 27. PMID:17192261 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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