Abstract of the PDB Structure's related Publication:
N(6)-Threonylcarbamoyladenosine (t(6)A) is a modified tRNA base required for accuracy in translation. Qri7 is localized in yeast mitochondria and is involved in t(6)A biosynthesis. In t(6)A biosynthesis, threonylcarbamoyl-adenylate (TCA) is synthesized from threonine, bicarbonate and ATP, and the threonyl-carbamoyl group is transferred to adenine 37 of tRNA by Qri7. Qri7 alone is sufficient to catalyze the second step of the reaction, whereas the Qri7 homologues YgjD (in bacteria) and Kae1 (in archaea and eukaryotes) function as parts of multi-protein complexes. In this study, the crystal structure of Qri7 complexed with AMP (a part of TCA) has been determined at 2.94 Å resolution in a new crystal form. The manner of AMP recognition is similar, with some minor variations, among the Qri7/Kae1/YgjD family proteins. The previously reported dimer formation was also observed in this new crystal form. Furthermore, a comparison with the structure of TobZ, which catalyzes a similar reaction to t(6)A biosynthesis, revealed the presence of a flexible loop that may be involved in tRNA binding.
This protein is the mitochondrial paralog of cytoplasmic Kae1 and ortholog of bacterial TsaD (YgjD). Required for the formation of a threonylcarbamoyl group on adenosine at position 37 (t6A37) in mitochondrial tRNAs that read codons beginning with adenine. Qri7 alone is sufficient to catalyze the transfer of the threonyl-carbamoyl group to adenine 37 of tRNA, whereas the Qri7 homologues YgjD (in bacteria) and Kae1 (in archaea and eukaryotes) function as parts of multi-protein complexes.