guanosine(34) in tRNA + queuine = queuosine(34) in tRNA + guanine
guanosine(34) in trna + queuine = queuosine(34) in trna + guanine
"tRNA-guanosine(34) queuine transglycosylase"
"trna-guanosine(34) queuine transglycosylase"