M7GpppX diphosphatase (, DcpS, m7GpppX pyrophosphatase, m7GpppN m7GMP phosphohydrolase) is an enzyme with systematic name m7G5'ppp5'N m7GMP phosphohydrolase. This enzyme catalyses the following chemical reaction
(1) m7G5'ppp5'N(3'ppp5'N)n + H2O 7-methylguanosine 5'-phosphate + pp5'N(3'ppp5'N)n (2) 7-methylguanosine 5'-diphosphate + H2O 7-methylguanosine 5'-phosphate + phosphate
Decapping is a process in the control of eukaryotic mRNA degradation.
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