4709 Adenylation_mRNA_cappingThalassiosira pseudonana
GO:0004484 GO:0006370 GO:0006397 -
mRNA guanylyltransferase activity
Catalysis of the reaction: GTP + (5')pp-Pur-mRNA = diphosphate + G(5')ppp-Pur-mRNA; G(5')ppp-Pur-mRNA is mRNA containing a guanosine residue linked 5' through three phosphates to the 5' position of the terminal residue.
7-methylguanosine mRNA capping
Addition of the 7-methylguanosine cap to the 5' end of a nascent messenger RNA transcript.
Any process involved in the conversion of a primary mRNA transcript into one or more mature mRNA(s) prior to translation into polypeptide.