tRNA N(6)-L-threonylcarbamoyladenine synthase activity
trna n(6)-l-threonylcarbamoyladenine synthase activity
Catalysis of the reaction: L-threonylcarbamoyladenylate + adenine(37) in tRNA = AMP + N(6)-L-threonylcarbamoyladenine(37) in tRNA.