7n5k

PCNA from Thermococcus gammatolerans: crystal II, collection 1, 1.98 A, 3.84 MGy

spinqualitylabelsall models 7n5k, resolution 1.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7n5k is a 4 chain structure with sequence from Thermococcus gammatolerans EJ3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.98Å Ligands: GOL, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PCNA_THEGJ Sliding clamp subunit that acts as a moving platform for DNA processing. Responsible for tethering the catalytic subunit of DNA polymerase and other proteins to DNA during high-speed replication. Publication Abstract from PubMed Proliferating cell nuclear antigen (PCNA) is an essential protein for cell viability in archaea and eukarya, since it is involved in DNA replication and repair. In order to obtain insights regarding the characteristics that confer radioresistance, the structural study of the PCNA from Thermococcus gammatolerans (PCNATg ) in a gradient of ionizing radiation by X-ray crystallography was carried out, together with a bioinformatic analysis of homotrimeric PCNA structures, their sequences, and their molecular interactions. The results obtained from the datasets and the accumulated radiation dose for the last collection from three crystals revealed moderate and localized damage, since even with the loss of resolution, the electron density map corresponding to the last collection allowed to build the whole structure. Attempting to understand this behavior, multiple sequence alignments, and structural superpositions were performed, revealing that PCNA is a protein with a poorly conserved sequence, but with a highly conserved structure. The PCNATg presented the highest percentage of charged residues, mostly negatively charged, with a proportion of glutamate more than double aspartate, lack of cysteines and tryptophan, besides a high number of salt bridges. The structural study by X-ray crystallography reveals that the PCNATg has the intrinsic ability to resist high levels of ionizing radiation, and the bioinformatic analysis suggests that molecular evolution selected a particular composition of amino acid residues, and their consequent network of synergistic interactions for extreme conditions, as a collateral effect, conferring radioresistance to a protein involved in the chromosomal DNA metabolism of a radioresistant microorganism. PCNA from Thermococcus gammatolerans: A protein involved in chromosomal DNA metabolism intrinsically resistant at high levels of ionizing radiation.,Marin-Tovar Y, Serrano-Posada H, Diaz-Vilchis A, Rudino-Pinera E Proteins. 2022 Apr 18. doi: 10.1002/prot.26346. PMID:35435259 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Proliferating cell nuclear antigen 3D structures

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