This domain of unknown function is found in tRNA(Ile2) 2-agmatinylcytidine synthetase TiaS. TiaS is an archaeal ATP-dependent agmatine transferase that catalyzes the formation of 2-agmatinylcytidine (agm2C) at the wobble position (C34) of tRNA(Ile2). This modified base specifically recognizes AUA codons.
Jiyao W et al.(2023). "The conserved domain database in 2023.",