DNA polymerase sliding clamp 3 - Q973F5 (PCNA3_SULTO)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q973F5: 2
 
Function
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 (By similarity). Both trimeric complexes inhibit DNA ligase and both 3'-5' and 5'-3' activity of Hel308 (Hjm) helicase, but stimulate Hjc, the Holliday junction cleavage enzyme. UniProt
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Subunit Structure
The subunits circularize to form a toroid; DNA passes through its center. Replication factor C (RFC) is required to load the toroid on the DNA (By similarity). Forms dimeric complexes with PCNA1 and PCNA2, and trimeric complexes with PCNA123 and PCNA323; does not form homotrimers (PubMed:18782564). Crystal structures show a heterotetramer of 2 PCNA2 and 2 PCNA3, which would be large enough to clamp a Holliday junction (PubMed:21352919). UniProt
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Data in blue originates from PDB
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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