a 5'-end CoA-ribonucleoside in mRNA + H2O => 3'-dephospho-CoA + a 5'-end phospho-ribonucleoside in mRNA + H(+)
a 5'-end coa-ribonucleoside in mrna + h2o => 3'-dephospho-coa + a 5'-end phospho-ribonucleoside in mrna + h(+)