RNA 5'-monophosphate methyltransferase (Bcdin3d)

O-methyltransferase that especially dimethylates the 5' monophosphate of pre-miRNAs, acting as a negative regulator of miRNA processing. The 5' monophosphate of pre-miRNAs is recognized by DICER1 and is needed for pre-miRNAs processing: methylation at this position reduces the processing of pre-miRNAs by DICER1.

Able to mediate methylation of pre-miR-145, in addition to other pre- miRNAs (By similarity). .