This model represents the CopA copper resistance protein family. CopA is related to laccase (benzenediol:oxygen oxidoreductase) and L-ascorbate oxidase, both copper-containing enzymes. Most members have a typical TAT (twin-arginine translocation) signal sequence with an Arg-Arg pair. Twin-arginine translocation is observed for a large number of periplasmic proteins that cross the inner membrane with metal-containing cofactors already bound. The combination of copper-binding sites and TAT translocation motif suggests a mechansism of resistance by packaging and export. [Cellular processes, Detoxification, Transport and binding proteins, Cations and iron carrying compounds]
Jiyao W et al.(2023). "The conserved domain database in 2023.",