6n9l

Crystal structure of T. maritima UvrA d117-399 with ADP

spinqualitylabelsall models 6n9l, resolution 2.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6n9l is a 1 chain structure with sequence from Thermotoga maritima. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.01Å Ligands: ADP, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function UVRA_THEMA The UvrABC repair system catalyzes the recognition and processing of DNA lesions. UvrA is an ATPase and a DNA-binding protein. A damage recognition complex composed of 2 UvrA and 2 UvrB subunits scans DNA for abnormalities. When the presence of a lesion has been verified by UvrB, the UvrA molecules dissociate (By similarity). Publication Abstract from PubMed The UvrA2 dimer finds lesions in DNA and initiates nucleotide excision repair. Each UvrA monomer contains two essential ATPase sites: proximal (P) and distal (D). The manner whereby their activities enable UvrA2 damage sensing and response remains to be clarified. We report three key findings from the first pre-steady state kinetic analysis of each site. Absent DNA, a P2ATP-D2ADP species accumulates when the low-affinity proximal sites bind ATP and enable rapid ATP hydrolysis and phosphate release by the high-affinity distal sites, and ADP release limits catalytic turnover. Native DNA stimulates ATP hydrolysis by all four sites, causing UvrA2 to transition through a different species, P2ADP-D2ADP. Lesion-containing DNA changes the mechanism again, suppressing ATP hydrolysis by the proximal sites while distal sites cycle through hydrolysis and ADP release, to populate proximal ATP-bound species, P2ATP-Dempty and P2ATP-D2ATP. Thus, damaged and native DNA trigger distinct ATPase site activities, which could explain why UvrA2 forms stable complexes with UvrB on damaged DNA compared with weaker, more dynamic complexes on native DNA. Such specific coupling between the DNA substrate and the ATPase mechanism of each site provides new insights into how UvrA2 utilizes ATP for lesion search, recognition and repair. The ATPase mechanism of UvrA2 reveals the distinct roles of proximal and distal ATPase sites in nucleotide excision repair.,Case BC, Hartley S, Osuga M, Jeruzalmi D, Hingorani MM Nucleic Acids Res. 2019 Mar 20. pii: 5403497. doi: 10.1093/nar/gkz180. PMID:30892613 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also UvrABC

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