Component of the origin recognition complex (ORC) that binds origins of replication (PubMed:11850415). It has a role in both chromosomal replication and mating type transcriptional silencing (PubMed:11850415). ORC binds to multiple sites within the ars1 origin of DNA replication in an ATP-independent manner (PubMed:11850415). Together with cdc18, plays a role in preventing DNA rereplication and resulting genetic instability upon cell cycle-regulated phosphorylation by cdc2 (PubMed:11486016). ORC is composed of six subunits. ORC interacts with cdc18, recruiting it to the ars1 origin of replication (PubMed:10535928, PubMed:11850415). Interacts with spb70 (PubMed:15314153). Interacts with spp2; preferentially associates with the unphosphorylated orc2 in G1 pre-Start prior to orc2 being phosphorylated by cdc2, the interaction is mediated by spb70 and might enable the association of the whole alpha DNA polymerase complex to orc2/spb70 complex on chromatin (PubMed:15314153). Phosphorylated by cdc2 and cdc13 (in vitro) (PubMed:11486016). Phosphorylation appears first in S phase and becomes maximal in G2 and M when cdc2 kinase activity is required to prevent reinitiation of DNA replication (PubMed:11486016). Belongs to the ORC2 family.