diphthine-[translation elongation factor 2] + NH4(+) + ATP = diphthamide-[translation elongation factor 2] + AMP + diphosphate + H(+)
diphthine-[translation elongation factor 2] + nh4(+) + atp = diphthamide-[translation elongation factor 2] + amp + diphosphate + h(+)
"diphthamide synthase"
"diphthamide synthase"