Anti-qtrtd1 antibodies enable researchers to detect and measure the qtrtd1 antigen in biological samples. This target is a reported synonym of the QTRT2 gene, which encodes queuine tRNA-ribosyltransferase accessory subunit 2. This protein is reported to be a non-catalytic subunit of the queuine tRNA-ribosyltransferase (TGT) that catalyzes the base-exchange of a guanine (G) residue with queuine (Q) at position 34 (anticodon wobble position) in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr), resulting in the hypermodified nucleoside queuosine (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-yl)amino)methyl)-7-deazaguanosine). The human version of qtrtd1 has a canonical amino acid length of 415 residues and a protein mass of 46.7 kilodaltons, although 4 isoforms have been identified. It is reported to be localized in the membrane, mitochondria, and cytoplasm of cells. qtrtd1 is a member of the Queuine tRNA-ribosyltransferase protein family.