L-amino acyl-L-threonyl-[protein] + ATP => (S,S)-2-(C-substituted-aminomethyl)-4-acyl-5-methyl-2-oxazoline-[protein] + ADP + phosphate + H(+)
l-amino acyl-l-threonyl-[protein] + atp => (s,s)-2-(c-substituted-aminomethyl)-4-acyl-5-methyl-2-oxazoline-[protein] + adp + phosphate + h(+)