Catalysis of 5-taurinomethyluridine in tRNA + a [protein]-S-sulfanylcysteine + ATP + a reduced electron acceptor = a 5-taurinomethyl-2-thiouridine in tRNA + a [protein]-L-cysteine + AMP + an oxidized electron acceptor + diphosphate + H+.
Synonyms:
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EC:2.8.1.14; MetaCyc:RXN-16821; RHEA:47040; reactome:R-HSA-6787447 "TRMU (MTO2, MTU1) transfers a sulfur atom to 5-taurinomethyluridine-34 in tRNA"