31256 TGT superfamilyThalassiosira pseudonana
GO:0006400 GO:0008479 GO:0008616 -
The covalent alteration of one or more nucleotides within a tRNA molecule to produce a tRNA molecule with a sequence that differs from that coded genetically.
queuine tRNA-ribosyltransferase activity
Catalysis of the reaction: tRNA guanine + queuine = tRNA queuine + guanine.
queuosine biosynthetic process
The chemical reactions and pathways resulting in the formation of queuosines, any of a series of nucleosides found in tRNA and having an additional pentenyl ring added via an NH group to the methyl group of 7-methylguanosine. The pentenyl ring may carry other substituents.