MnmA/TRMU family 2-thiouridylases and similar proteins
This family is composed of bacterial tRNA-specific 2-thiouridylase MnmA (EC 2.8.1.13) and mitochondrial tRNA-specific 2-thiouridylase 1 (TRMU or MTU1, EC 2.8.1.14). MnmA catalyzes the 2-thiolation of uridine at the wobble position (U34) of tRNA, leading to the formation of s(2)U34. TRMU/MTU1 catalyzes the 2-thiolation of uridine at the wobble position (U34) of mitochondrial tRNA(Lys), tRNA(Glu) and tRNA(Gln); this is required for the formation of 5-taurinomethyl-2-thiouridine (tm5s2U) of mitochondrial tRNA(Lys), tRNA(Glu), and tRNA(Gln) at the wobble position. This family belongs to the adenine nucleotide alpha hydrolase (AANH) superfamily that also includes other N-type ATP PPases and ATP sulfurylases. It forms an alpha/beta/alpha fold which binds to the adenosine group.