M7GpppX diphosphatase

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 $$\rightleftharpoons$$ 7-methylguanosine 5'-phosphate + pp5'N(3'ppp5'N)n
 * (2) 7-methylguanosine 5'-diphosphate + H2O $$\rightleftharpoons$$ 7-methylguanosine 5'-phosphate + phosphate

Decapping is a process in the control of eukaryotic mRNA degradation.