2b0r

Crystal Structure of Cyclase-Associated Protein from Cryptosporidium parvum

spinqualitylabelsall models 2b0r, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2b0r is a 2 chain structure with sequence from Cryptosporidium parvum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: UNX Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q5CS32_CRYPI 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 Cyclase-associated proteins (CAPs) are evolutionary conserved G-actin-binding proteins that regulate microfilament turnover. CAPs have a modular structure consisting of an N-terminal adenylate cyclase binding domain, a central proline-rich segment, and a C-terminal actin binding domain. Protozoan parasites of the phylum Apicomplexa, such as Cryptosporidium and the malaria parasite Plasmodium, express small CAP orthologs with homology to the C-terminal actin binding domain (C-CAP). Here, we demonstrate by reverse genetics that C-CAP is dispensable for the pathogenic Plasmodium blood stages. However, c-cap(-) parasites display a complete defect in oocyst development in the insect vector. By trans-species complementation we show that the Cryptosporidium parvum ortholog complements the Plasmodium gene functions. Purified recombinant C. parvum C-CAP protein binds actin monomers and prevents actin polymerization. The crystal structure of C. parvum C-CAP shows two monomers with a right-handed beta-helical fold intercalated at their C termini to form the putative physiological dimer. Our results reveal a specific vital role for an apicomplexan G-actin-binding protein during sporogony, the parasite replication phase that precedes formation of malaria transmission stages. This study also exemplifies how Plasmodium reverse genetics combined with biochemical and structural analyses of orthologous proteins can offer a fast track toward systematic gene characterization in apicomplexan parasites. Structure and function of a G-actin sequestering protein with a vital role in malaria oocyst development inside the mosquito vector.,Hliscs M, Sattler JM, Tempel W, Artz JD, Dong A, Hui R, Matuschewski K, Schuler H J Biol Chem. 2010 Apr 9;285(15):11572-83. Epub 2010 Jan 18. PMID:20083609 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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