mRNA guanylyltransferase activity (Q21119980)
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.
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aliases GO:0004484
 GTP:mRNA guanylyltransferase activity
 messenger RNA guanylyltransferase activity
 GTP--RNA guanylyltransferase activity
description 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.

External Links
(P686) GO:0004484