Reaction catalyzed by tRNAHis guanylyltransferase (2.7.7.79)
p-tRNAHis
+
+
=
pppGp-tRNAHis
+
+
p-tRNAHis
+
dATP
+
GTP
=
pppGp-tRNAHis
+
dAMP
+
diphosphate