2io4 | pdb_00002io4

Crystal structure of PCNA12 dimer from Sulfolobus solfataricus.

spinqualitylabelsall models 2io4, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2io4 is a 4 chain structure with sequence from Sulso. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, MPD Related: 2ijx, 2izo, 2ix2 Gene: pcnB, pcnA-2 (SULSO), pcnC, pcnA-2 (SULSO) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PCNA2_SULSO] Sliding clamp subunit. Responsible for tethering the catalytic subunit of DNA polymerase to DNA during high-speed replication. [PCNA3_SULSO] Sliding clamp subunit. Responsible for tethering the catalytic subunit of DNA polymerase to DNA during high-speed replication (By similarity). 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 DNA sliding clamps form an oligomeric ring encircling DNA and serve as a moving platform for DNA-processing proteins. The opening and closing of a sliding-clamp ring is essential to load the clamp onto DNA in order to perform its functions. The molecular details of how clamp rings open and enclose DNA are still not clear. Three PCNA homologues have been found in Sulfolobus solfataricus which form a heterotrimer. Taking advantage of their hetero-oligomeric nature, the structures of the PCNAs in monomeric PCNA3, dimeric PCNA1-PCNA2 and trimeric PCNA1-PCNA2-PCNA3 forms were determined at resolutions of 2.6-1.9 A. The distinct oligomeric structures represent different stages in ring formation, which were verified in solution by ultracentrifugation analysis. The heterodimer opens in a V-shape of 130 degrees , while the heterotrimers form a ring with a 120 degrees rotation between monomers. The association of a rigid PCNA3 monomer with an opened PCNA1-PCNA2 heterodimer closes the ring and introduces a spring tension in the PCNA1-PCNA2 interface, thus bending the nine-stranded intermolecular beta-sheet to fit the 120 degrees rotation. The release of the spring tension as PCNA3 dissociates from the ring may facilitate ring opening. The structural features in different assemblies present a molecular model for clamp ring assembly and opening. Structures of monomeric, dimeric and trimeric PCNA: PCNA-ring assembly and opening.,Hlinkova V, Xing G, Bauer J, Shin YJ, Dionne I, Rajashankar KR, Bell SD, Ling H Acta Crystallogr D Biol Crystallogr. 2008 Sep;64(Pt 9):941-9. Epub 2008, Aug 13. PMID:18703842 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Proliferating Cell Nuclear Antigen

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