polynucleotide 5'-phosphatase activity pyrophosphatase activity catalytic activity, acting on RNA mRNA 5'-triphosphate monophosphatase activity https://github.com/geneontology/go-ontology/issues/23319 https://github.com/geneontology/go-ontology/issues/25810 https://github.com/geneontology/go-ontology/issues/26929 https://github.com/geneontology/go-ontology/issues/30193 https://github.com/geneontology/go-ontology/issues/31924 GO:0140818 EC:3.6.1.74 A 5'-end triphospho-[mRNA] + H2O = a 5'-end diphospho-[mRNA] + H+ + phosphate. RHEA:60828 2022-05-16T06:01:07Z pg MetaCyc:POLYNUCLEOTIDE-5-PHOSPHATASE-RXN RHEA:67004 RHEA:60832 molecular_function mRNA 5'-phosphatase activity RHEA:11008