a 5'-end NAD(+)-phospho-ribonucleoside in mRNA + H2O <=> a 5'-end phospho-adenosine-phospho-ribonucleoside in mRNA + beta-nicotinamide D-ribonucleotide + 2 H(+)
a 5'-end nad(+)-phospho-ribonucleoside in mrna + h2o <=> a 5'-end phospho-adenosine-phospho-ribonucleoside in mrna + beta-nicotinamide d-ribonucleotide + 2 h(+)