Auxiliary protein of DNA polymerase delta and is involved in the control of DNA replication by increasing the polymerase processibility during elongation of the leading strand (By similarity). Involved in DNA damage response (PubMed:26251451). Homotrimer (PubMed:26251451, PubMed:30052905). Interacts with ORC1 (via PIP-box motif); the interaction occurs during DNA replication in trophozoites (PubMed:18554328, PubMed:26251451). Interacts with ORC5; the interaction occurs during the trophozoite stage but not at the late schizont stage (PubMed:18554328, PubMed:19633266, PubMed:26251451). Interacts with FEN1 (PubMed:26251451). During early-to mid replicating trophozoite stages, colocalizes with ORC1 and ORC5 to distinct nuclear foci which probably are DNA replication origin sites (PubMed:18554328, PubMed:19633266, PubMed:26251451). Dissociates from ORC1 and ORC5 during the late schizont stage (PubMed:18554328, PubMed:19633266). Expressed during the asexual blood stage, specifically during the trophozoite and schizont stages (at protein level). Induced by DNA damage (at protein level). Belongs to the PCNA family.