Queuosine
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Queuosine is a modified nucleoside that is present in certain tRNAs in bacteria and eukaryotes.[1][2] It contains the nucleobase queuine. Originally identified in E. coli, queuosine was found to occupy the first anticodon position of tRNAs for histidine, aspartic acid, asparagine and tyrosine.[3] The first anticodon position pairs with the third "wobble" position in codons, and queuosine improves accuracy of translation compared to guanosine.[4][5][6] Synthesis of queuosine begins with GTP. In bacteria, three structurally unrelated classes of riboswitch are known to regulate genes that are involved in the synthesis or transport of pre-queuosine1, a precursor to queuosine: PreQ1-I riboswitches, PreQ1-II riboswitches and PreQ1-III riboswitches.
Queuosine biosynthesis genes have also been found on phage genomes and may be involved in protection from genome degradation by the host.[7][8]
References
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Further reading
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External links
- Wikigenes: Queuosine
- Human Metabolome Database: Queuosine (HMDB11596)