In the process of mRNA degradation, seems to play a role in mRNA decapping. Component of a complex containing DCP2 and DCP1A which functions in decapping of ARE-containing mRNAs. Promotes complex formation between DCP1A and DCP2. Enhances the catalytic activity of DCP2 (in vitro). . This is the function of Ensembl gene identifier ENSG00000038358 (EDC4, enhancer of mRNA decapping 4).