2xgg

STRUCTURE OF TOXOPLASMA GONDII MICRONEMAL PROTEIN 2 A_I DOMAIN

spinqualitylabelsall models 2xgg, resolution 2.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2xgg is a 2 chain structure with sequence from Toxoplasma gondii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL Resources: FirstGlance, OCA, RCSB, PDBsum 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 Toxoplasma gondii is a widespread zoonotic pathogen capable of causing serious disease in humans and animals. As an obligate intracellular parasite, T. gondii relies on the orchestrated secretion of proteins from its apical complex organelles including the multi-modular, transmembrane micronemal protein 2 (MIC2) that couples recognition of the host cell with cytoskeletal reorganization of the parasite to drive invasion. To probe the basis by which the von Willebrand Factor A (vWA) - Integrin like module of TgMIC2 engages the host cell, we solved the crystal structure of a truncated form of TgMIC2A/I (TgMIC2A/Ic) phased by iodide SIRAS and refined to a resolution of 2.05A. The TgMIC2A/Ic core is organized into a central twisted beta sheet flanked by alpha helices consistent with a canonical vWA fold. A restricted basic patch serves as the putative heparin binding site, but no heparin binding was detected in native gel shift assays. Furthermore, no metal was observed in the metal ion dependent adhesion site (MIDAS). Structural overlays with homologous A/I domains reveal a divergent organization of the MIDAS beta4-alpha4 loop in TgMIC2A/Ic, which is stabilized through the burial of Phe195 into a deep pocket formed by Gly185. Intriguingly, Gly185 appears be unique among A/I domains to TgMIC2A/I suggesting that the divergent loop conformation may also be unique to TgMIC2A/I. Though lacking the C-terminal extension, the TgMIC2A/Ic structure reported here is the first of an A/I domain from an apicomplexan parasite and provides valuable insight into defining the molecular recognition of host cells by these widespread pathogens. Structure of the micronemal protein 2 (MIC2) A/I domain from Toxoplasma gondii.,Tonkin ML, Grujic O, Pearce M, Crawford J, Boulanger MJ Protein Sci. 2010 Aug 3. PMID:20684023 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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