The virus-specific 2-cysteine adaptor domain is found fused to OTU/A20-like peptidases and S/T protein kinases. The domain associations of these proteins indicate that they might function as viral adaptors connecting the kinases and OTU/A20 peptidases to specific targets [1].

1: Evolutionary genomics of nucleo-cytoplasmic large DNA viruses. Iyer LM, Balaji S, Koonin EV, Aravind L; Virus Res. 2006;117:156-184. PMID:16494962