9gxo
From Proteopedia
C. thermocellum UvrA in complex with unmodified DNA and AMPPNP (ATP-bound conformation 2)
Structural highlights
FunctionA3DC70_ACET2 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.[HAMAP-Rule:MF_00205] Publication Abstract from PubMedNucleotide excision repair is a DNA repair pathway which detects and fixes various DNA lesions that distort the structure of DNA. In bacteria, the pathway starts with the UvrA protein which has two adenosine triphosphatase modules and forms dimers. The DNA is handed over from UvrA to UvrB, which is a weak helicase that verifies the presence of damage. Despite intense studies, the role of the ATPase activity of UvrA in damage recognition is unclear. Here, we present a series of cryo-electron microscopy structures of UvrA in complex with three different DNAs and in the presence and absence of nucleotides. We also present a structure of UvrA:UvrB:DNA complex. These structures reveal a major rearrangement of the UvrA dimer upon ATP binding. We propose that these conformational changes are used to mechanically probe the integrity of DNA for damage localization. Collectively, our results present snapshots of UvrA's ATP-dependent DNA damage detection. Structural snapshots of the mechanism of ATP-dependent DNA damage recognition by UvrA.,Nirwal S, Czarnocki-Cieciura M, Zajko W, Skowronek K, Szczepanowski RH, Nowotny M Nat Commun. 2025 Dec 11. doi: 10.1038/s41467-025-67075-y. PMID:41381534[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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