8giz

E. coli clamp loader with open clamp

spinqualitylabelsall models 8giz, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8giz is a 8 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.7Å Ligands: AGS, MG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Ring-shaped DNA sliding clamps are essential for DNA replication and genome maintenance. Clamps need to be opened and chaperoned onto DNA by clamp loader complexes (CLCs). Detailed understanding of the mechanisms by which CLCs open and place clamps around DNA remains incomplete. Here, we present a series of six structures of the Escherichia coli CLC bound to an open or closed clamp prior to and after binding to a primer-template DNA, representing the most significant intermediates in the clamp loading process. We show that the ATP-bound CLC first binds to a clamp, then constricts to hold onto it. The CLC then expands to open the clamp with a gap large enough for double-stranded DNA to enter. Upon binding to DNA, the CLC constricts slightly, allowing clamp closing around DNA. These structures provide critical high-resolution snapshots of clamp loading by the E. coli CLC, revealing how the molecular machine works. Structural characterisation of the complete cycle of sliding clamp loading in Escherichia coli.,Xu ZQ, Jergic S, Lo ATY, Pradhan AC, Brown SHJ, Bouwer JC, Ghodke H, Lewis PJ, Tolun G, Oakley AJ, Dixon NE Nat Commun. 2024 Sep 27;15(1):8372. doi: 10.1038/s41467-024-52623-9. PMID:39333521 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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