RNA guanine-N7 methyltransferase activating subunit (Ramac)

Regulatory subunit of the mRNA-capping methyltransferase RNMT:RAM/FAM103A1 complex that methylates the N7 position of the additional guanosine into the 5'-cap structure of mRNAs. Promotes the recruitment of the methyl donor, S-adenosyl-L-methionine, to RNMT.

Regulates RNMT expression with a post-transcriptional stabilizing mechanism. Binds RNA.