Plays a central role in the packaging of viral DNA into phage procapsid, which occurs in the late stage of infection. The protein C can interact with the replicative complex composed of the protein A, the host rep and the viral DNA after the completion of one round of DNA synthesis. When protein C is bound to the replicative form, the complex becomes accessible to procapsid and serves as a DNA packaging apparatus. Belongs to the microviridae C protein family.