3ici

Crystal structure of cyclophilin B in complex with calmegin fragment

spinqualitylabelsall models 3ici, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ici is a 3 chain structure with sequence from Canis lupus familiaris and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: MES, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease PPIB_HUMAN Defects in PPIB are the cause of osteogenesis imperfecta type 9 (OI9) [MIM:259440. OI9 is a connective tissue disorder characterized by bone fragility, low bone mass and bowing of limbs due to multiple fractures. Short limb dwarfism and blue sclerae are observed in some but not all patients. Function PPIB_HUMAN PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. 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 Little is known about how chaperones in the endoplasmic reticulum are organized into complexes to assist in the proper folding of secreted proteins. One notable exception is the complex of ERp57 and calnexin that functions as part the calnexin cycle to direct disulfide bond formation in N-glycoproteins. Here, we report three new complexes composed of the peptidyl prolyl cis-trans isomerase cyclophilin B and any of the lectin chaperones: calnexin (CNX), calreticulin (CRT), or calmegin (CMG). The 1.7 A crystal structure of cyclophilin with the proline-rich P-domain of CMG reveals that binding is mediated by the same surface that binds ERp57. We use NMR titrations and mutagenesis to measure low micromolar binding of cyclophilin to all three lectin chaperones and identify essential interfacial residues. The immunosuppressant cyclosporin A did not affect complex formation, confirming the functional independence of the P-domain-binding and proline isomerization sites of cyclophilin. Our results reveal the P-domain functions as a unique protein-protein interaction domain and implicate a peptidyl prolyl isomerase as a new element in the calnexin cycle. Structural basis of cyclophilin B binding by the calnexin/calreticulin P-domain.,Kozlov G, Bastos-Aristizabal S, Maattanen P, Rosenauer A, Zheng F, Killikelly A, Trempe JF, Thomas DY, Gehring K J Biol Chem. 2010 Sep 3. PMID:20801878 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cyclophilin 3D structures

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