diphthamide-[translation elongation factor 2] + NAD(+) <=> N-(ADP-D-ribosyl)diphthamide-[translation elongation factor 2] + nicotinamide + H(+)
diphthamide-[translation elongation factor 2] + nad(+) <=> n-(adp-d-ribosyl)diphthamide-[translation elongation factor 2] + nicotinamide + h(+)
diphthamide-[translation elongation factor 2] + NAD(+) <=> N-(ADP-D-ribosyl)diphthamide-[translation elongation factor 2] + nicotinamide + H(+)
diphthamide-[translation elongation factor 2] + nad(+) <=> n-(adp-d-ribosyl)diphthamide-[translation elongation factor 2] + nicotinamide + h(+)