Identification of Regions within the Four Small Subunits of Human Replication Factor C Required for Complex Formation and DNA Replication*

Replication factor C (RFC) and proliferating cell nuclear antigen (PCNA) are processivity factors for eukaryotic DNA polymerases δ and ε. RFC binds to a DNA primer end and loads PCNA onto DNA in an ATP-dependent reaction. The five RFC subunits p140, p40, p38, p37, and p36, all of which are required to form the active RFC complex, share regions of high homology including the defined RFC boxes II-VIII. RFC boxes III and V constitute a putative ATP binding site, whereas the function of the other conserved boxes is unknown. To study the individual subunits in the RFC complex and the role of the RFC boxes, deletion mutations were created in all subunits. Sequences close to the C terminus of each of the small subunits are required for formation of the five subunit complex. A N-terminal region of the small subunits, containing the RFC homology box II, plays a critical role in the function of these subunits, deletion of which reduces but does not abolish RFC activity in loading PCNA onto DNA and in supporting an RFC-dependent replication reaction. The N termini of p37 and p40, although highly homologous, are not interchangeable, suggesting unique functions for the individual subunits.

• Publication year

  1997

• Venue

  Journal of Biological Chemistry

• Publication date

  1997-04-11

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/JBC.272.15.10065PMID 9092550
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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