Acts as a cyclin-like protein and plays a role in the modulation of host cell cycle. May promote G2/S arrest by interacting with host mus209/PCNA, cdc2 and cdk6. The cell cycle arrest is characterized by an intact nuclear envelope, concomitant with sustained activity of host cdc2. However, viral DNA replication still occurs in the arrested cells. Interacts with host mus209/PCNA, cdc2 and cdk6. Forms a complex with proteins C42 and p78/83. Belongs to the baculoviridae E27 family.