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Transglycosylation: A mechanism for RNA modification (and editing?)

Authors
Journal
Bioorganic Chemistry
0045-2068
Publisher
Elsevier
Publication Date
Volume
33
Issue
3
Identifiers
DOI: 10.1016/j.bioorg.2005.01.001
Keywords
  • Rna
  • Modification
  • Editing
  • Pseudouridine
  • Queuosine
  • Transglycosylation
Disciplines
  • Chemistry

Abstract

Abstract The vast majority of the ca. 100 chemically distinct modified nucleosides in RNA appear to arise via the chemical transformation of a genetically encoded nucleoside. Two notable exceptions are queuosine and pseudouridine, which are incorporated into tRNA via transglycosylation. Transglycosylation is an extremely efficient process for incorporating highly modified bases such as queuine into RNA. Transglycosylation is also a requisite process for “isomerizing” an N-nucleoside into a C-nucleoside as is the case for pseudouridine formation. Finally, transglycosylation is an attractive possibility for certain RNA editing events (e.g., pyrimidine to purine conversions) that cannot occur via the known, more straightforward enzymatic reactions (e.g., deaminations). This review discusses what is known about the mechanisms of transglycosylation for the queuine and pseudouridine RNA modifications and will speculate about a potential role for transglycosylation in certain RNA editing events.

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