Reaction catalyzed by tRNA-guanine15 transglycosylase (2.4.2.48)
guanine13 in tRNA(Leu)
+
=
7-cyano-7-carbaguanine13 in tRNA(Leu)
+
guanine13 in tRNA(Leu)
+
7-cyano-7-carbaguanine
=
7-cyano-7-carbaguanine13 in tRNA(Leu)
+
guanine