8unf | pdb_00008unf

Cryo-EM structure of T4 Bacteriophage Clamp Loader with Sliding Clamp and DNA

spinqualitylabelsall models 8unf, resolution 3.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8unf is a 10 chain structure with sequence from Escherichia virus T4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.15Å Ligands: 08T, ADP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CLAMP_BPT4 Sliding clamp that encircles the genomic DNA and links the DNA polymerase to the template to control the processivity of DNA synthesis. Responsible for tethering the catalytic subunit of DNA polymerase to DNA during high-speed replication (PubMed:10535942). Interaction with the sliding-clamp-loader opens the sliding clamp so that it can be loaded around the DNA template (PubMed:22194570). During transcription, encircles the DNA and tethers host RNA polymerase (RNAP) to it (PubMed:33602900).[HAMAP-Rule:MF_04161] Publication Abstract from PubMed Clamp loaders are AAA+ ATPases that facilitate high-speed DNA replication. In eukaryotic and bacteriophage clamp loaders, ATP hydrolysis requires interactions between aspartate residues in one protomer, present in conserved 'DEAD-box' motifs, and arginine residues in adjacent protomers. We show that functional defects resulting from a DEAD-box mutation in the T4 bacteriophage clamp loader can be compensated by widely distributed single mutations in the ATPase domain. Using cryo-EM, we discovered an unsuspected inactive conformation of the clamp loader, in which DNA binding is blocked and the catalytic sites are disassembled. Mutations that restore function map to regions of conformational change upon activation, suggesting that these mutations may increase DNA affinity by altering the energetic balance between inactive and active states. Our results show that there are extensive opportunities for evolution to improve catalytic efficiency when an inactive intermediate is involved. Autoinhibition of a clamp-loader ATPase revealed by deep mutagenesis and cryo-EM.,Marcus K, Huang Y, Subramanian S, Gee CL, Gorday K, Ghaffari-Kashani S, Luo XR, Zheng L, O'Donnell M, Subramaniam S, Kuriyan J Nat Struct Mol Biol. 2024 Mar;31(3):424-435. doi: 10.1038/s41594-023-01177-3. , Epub 2024 Jan 4. PMID:38177685 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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