part of viral terminase complex viral terminase, large subunit GO:0098009 virus terminase, large subunit This term should only be used when the large subunit consists of more than one polypeptide. cellular_component bm The part of the viral terminase complex that contains the translocase and endonuclease activities and allows the translocation of the phage DNA into the procapsid. The large subunit usually assembles as a heterooligomer with the small subunit. 2012-07-25T10:13:00Z catalytic complex