Accessory component of the DNA polymerase epsilon complex (PubMed:10801849). Participates in DNA repair and in chromosomal DNA replication (By similarity). Forms a complex with CHRAC1 and binds naked DNA, which is then incorporated into chromatin, aided by the nucleosome-remodeling activity of ISWI/SNF2H and ACF1 (PubMed:10801849). Does not enhance nucleosome sliding activity of the ACF-5 ISWI chromatin remodeling complex (PubMed:14759371). {ECO:0000250|UniProtKB:Q04603, ECO:0000269|PubMed:10801849, ECO:0000269|PubMed:14759371}. This is the function of ENSG00000148229 (POLE3, DNA polymerase epsilon 3, accessory subunit).