ORC5 is a component of the origin recognition complex (ORC) that binds origins of replication. ORC is required to assemble the pre-replication complex necessary to initiate DNA replication. This is the lid domain, which with the N-terminal RecA-fold domain, constitutes the well-known AAA+ domain [1].

1: Structure of the active form of human origin recognition complex and its ATPase motor module. Tocilj A, On KF, Yuan Z, Sun J, Elkayam E, Li H, Stillman B, Joshua-Tor L; Elife. 2017; [Epub ahead of print] PMID:28112645