Reaction catalyzed by tRNA-guanosine34 preQ1 transglycosylase (2.4.2.29)

		+		[RNAECYMA]-2\'-deoxyguanine 34	=			+		[RNAECYMA]-2\'-deoxy-pre Q1
	7-aminomethyl-7-carbaguanine	+		[RNAECYMA]-2'-deoxyguanine 34	=		guanine	+		[RNAECYMA]-2'-deoxy-pre Q1