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EC 2.4.2.36 Details
EC number
2.4.2.36
Accepted name
NAD+—diphthamide ADP-ribosyltransferase
Reaction
NAD+ + diphthamide-[translation elongation factor 2] = nicotinamide + N-(ADP-D-ribosyl)diphthamide-[translation elongation factor 2]
Other name(s)
ADP-ribosyltransferase,
mono(ADPribosyl)transferase,
NAD—diphthamide ADP-ribosyltransferase,
NAD+:peptide-diphthamide N-(ADP-D-ribosyl)transferase
Systematic name
NAD+:diphthamide-[translation elongation factor 2] N-(ADP-D-ribosyl)transferase
CAS registry number
52933-21-8
Comment
Diphtheria toxin and some other bacterial toxins catalyse this reaction, which inactivates translation elongation factor 2 (EF2). The acceptor is diphthamide, a unique modification of a histidine residue in the elongation factor found in archaebacteria and all eukaryotes, but not in eubacteria. cf. EC 2.4.2.31 NAD(P)+—protein-arginine ADP-ribosyltransferase. The relevant histidine of EF2 is His715 in mammals, His699 in yeast and His600 in Pyrococcus horikoshii.
History
created 1990, modified 2013
EC Tree
2.4.2.13 created 1961, deleted 1965