4v8r

The crystal structures of the eukaryotic chaperonin CCT reveal its functional partitioning

spinqualitylabelsall models 4v8r, resolution 3.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4v8r is a 32 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.8Å Ligands: ADP, BEF, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TCPA_YEAST Molecular chaperone; assists the folding of proteins upon ATP hydrolysis. Known to play a role, in vitro, in the folding of actin and tubulin. In yeast may play a role in mitotic spindle formation. Publication Abstract from PubMed In eukaryotes, CCT is essential for the correct and efficient folding of many cytosolic proteins, most notably actin and tubulin. Structural studies of CCT have been hindered by the failure of standard crystallographic analysis to resolve its eight different subunit types at low resolutions. Here, we exhaustively assess the R value fit of all possible CCT models to available crystallographic data of the closed and open forms with resolutions of 3.8 A and 5.5 A, respectively. This unbiased analysis finds the native subunit arrangements with overwhelming significance. The resulting structures provide independent crystallographic proof of the subunit arrangement of CCT and map major asymmetrical features of the particle onto specific subunits. The actin and tubulin substrates both bind around subunit CCT6, which shows other structural anomalies. CCT is thus clearly partitioned, both functionally and evolutionary, into a substrate-binding side that is opposite to the ATP-hydrolyzing side. The Crystal Structures of the Eukaryotic Chaperonin CCT Reveal Its Functional Partitioning.,Kalisman N, Schroder GF, Levitt M Structure. 2013 Mar 5. pii: S0969-2126(13)00039-7. doi:, 10.1016/j.str.2013.01.017. PMID:23478063 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Chaperonin 3D structures

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