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1.W.4.  The Viral Portal Protein 4 (PPP4) Family 

Members of this family from eukaryotic viruses form portals in the viral capsid through which viral DNA is translocated during DNA packaging. The protein assembles as a dodecamer at a single fivefold axis of the T=16 icosahedric capsid. It binds to the molecular motor that translocates the viral DNA, termed terminase (Newcomb et al. 2001).

References associated with 1.W.4 family:

Newcomb, W.W., R.M. Juhas, D.R. Thomsen, F.L. Homa, A.D. Burch, S.K. Weller, and J.C. Brown. (2001). The UL6 gene product forms the portal for entry of DNA into the herpes simplex virus capsid. J. Virol. 75: 10923-10932. 11602732