Aspartyl/glutamyl-tRNA amidotransferase subunit B-related This domain is found in GatB and proteins related to bacterial Yqey. It is about 140 amino acid residues long. This domain is found at the C terminus of GatB which transamidates Glu-tRNA to Gln-tRNA. The function of this domain is uncertain. It does however suggest that Yqey and its relatives have a role in tRNA metabolism.