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Nucleoside Q is a is a modified 7-deazaguanosine nucleoside located in the anticodon wobble position of four amino acid-specific tRNAs. In bacteria, Nucleoside Q is produced from GTP (G837905) via the 7-deazaguanosine (D201390) precursor. Nucleoside Q and its derivatives usually replace guanosine in the anticodon of tRNAsGUN of eubacteria as well as cytoplasmic and mitochondrial tRNAs of some eukaryotes.

ChEBI: A nucleoside found in tRNA that has an additional cyclopentenyl ring added via an NH group to the methyl group of 7-methyl-7-deazaguanosine. The cyclopentenyl ring may carry other substituents.