This protein is an auxiliary protein of DNA polymerase delta and is involved in the control of eukaryotic DNA replication by increasing the polymerase's processibility during elongation of the leading strand. Induces a robust stimulatory effect on the 3'- 5' exonuclease and 3'-phosphodiesterase, but not apurinic- apyrimidinic (AP) endonuclease, APEX2 activities. Has to be loaded onto DNA in order to be able to stimulate APEX2. Homotrimer. Forms a complex with activator 1 heteropentamer in the presence of ATP. Interacts with EXO1, POLH, POLK, DNMT1, ERCC5, FEN1, CDC6 and POLDIP2. Interacts with APEX2; this interaction is triggered by reactive oxygen species and increased by misincorporation of uracil in nuclear DNA. Forms a ternary complex with DNTTIP2 and core histone. Interacts with KCTD10 and PPP1R15A. Interacts with POLD1, POLD3 and POLD4. Interacts with BAZ1B; the interaction is direct. Interacts with HLTF and SHPRH. Interacts with NUDT15. Interaction is disrupted in response to UV irradiation and acetylation. Interacts with p21Cip1/p21(CIP1) and CDT1; interacts via their PIP-box which also recruits the DCX(DTL) complex. Interacts with DDX11. Interacts with EGFR; positively regulates PCNA. Interacts with C12orf48/PARI. Interacts with SMARCAD1. Belongs to the PCNA family. Note: This description may include information from UniProtKB.
Protein type: Cell cycle regulation
Cellular Component: nucleoplasm; centrosome; PCNA complex; DNA replication factor C complex; cytoplasm; nuclear replication fork; nucleolus; nucleus
Molecular Function: identical protein binding; protein binding; DNA polymerase processivity factor activity; purine-specific mismatch base pair DNA N-glycosylase activity; MutLalpha complex binding; receptor tyrosine kinase binding; dinucleotide insertion or deletion binding
Biological Process: phosphoinositide-mediated signaling; mismatch repair; heart development; positive regulation of deoxyribonuclease activity; DNA strand elongation during DNA replication; leading strand elongation; response to lipid; DNA repair; telomere maintenance via semi-conservative replication; G1/S-specific transcription in mitotic cell cycle; cell proliferation; bypass DNA synthesis; response to cadmium ion; epithelial cell differentiation; nucleotide-excision repair; base-excision repair; transcription-coupled nucleotide-excision repair; telomere maintenance via recombination; nucleotide-excision repair, DNA gap filling; mitotic cell cycle; DNA replication; telomere maintenance; regulation of DNA replication; G1/S transition of mitotic cell cycle
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.