Reaction catalyzed by tRNAHis guanylyltransferase (2.7.7.79)
p-tRNAHis
+
ATP
+
+
H2O
=
pGp-tRNAHis
+
AMP
+
2
p-tRNAHis
+
ATP
+
GTP
+
H2O
=
pGp-tRNAHis
+
AMP
+
2 diphosphate
