Acts as a component of chromatin assembly factor 1 (CAF-1), which assembles histone octamers onto replicating DNA in vitro. It performs the first step of the nucleosome assembly process, bringing newly synthesized histones H3 and H4 to replicating DNA; histones H2A/H2B can bind to this chromatin precursor subsequent to DNA replication to complete the histone octamer. May facilitate the efficient and timely assembly of histones into telomeric chromatin (By similarity). Component of chromatin assembly factor 1 (CAF-1). Belongs to the RLF2 family.