Essential for the fidelity of chromosome transmission. Required for the DNA replication block checkpoint. Replication factor C (RFC) complex has an essential but redundant activity in sister chromatid cohesion establishment. An RFC-like complex (ctf18-RFC) is formed where ctf18 replaces rfc1 in the RFC complex along with the association of dcc1 and ctf8. This complex is required for efficient establishment of chromosome cohesion during S-phase. Acts as a PCNA loader, loading PCNA onto primed templates. Component of the ctf18-RFC complex which consists of ctf18, ctf8, dcc1, rfc2, rfc3, rfc4 and rfc5. Belongs to the CTF8 family.