. "Catalysis of the reaction: 5,10-methylenetetrahydrofolate + tRNA containing uridine at position 54 + FADH + H+ = tetrahydrofolate + tRNA containing ribothymidine at position 54 + FAD+." . . "methylenetetrahydrofolate-tRNA-(uracil-5-)-methyltransferase (FADH2-oxidizing) activity" . "5,10-methylenetetrahydrofolate:tRNA (uracil-5-)-methyltransferase activity" . "5,10-methylenetetrahydrofolate:tRNA-UPsiC (uracil-5-)-methyl-transferase activity" . "folate-dependent ribothymidyl synthase activity" . "methylenetetrahydrofolate-transfer ribonucleate uracil 5-methyltransferase activity" . "methylenetetrahydrofolate-tRNA-(uracil-5-)-methyltransferase (FADH-oxidizing) activity" . . .