Nucleoside Q

**Definition:** A modified nucleoside which is present in the first position of the anticodon of tRNA-tyrosine, tRNA-histidine, tRNA-asparagine and tRNA-aspartic acid of many organisms. It is believed to play a role in the regulatory function of tRNA. Nucleoside Q can be further modified to nucleoside Q*, which has a mannose or galactose moiety linked to position 4 of its cyclopentenediol moiety.

**Tree numbers:** - D03.633.100.759.590.454.500 - D13.570.583.454.500 - D13.570.800.453.500

**Synonyms:** - Q Nucleoside - Q-Ribonucleoside - Queuosine