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Updated: Jun 27, 2025

Identification of Footprints of RNA:Protein Complexes via RNA Immunoprecipitation in Tandem Followed by Sequencing RIPiT-Seq
Published on: July 10, 2019
Decapping NAD-RNAs: TIR domain-containing proteins stand out for specificity
1Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China.
Scientists discovered that bacterial and archaeal Toll/interleukin-1 receptor (TIR) domain proteins can remove NAD+-modified RNA (NAD-RNA) caps. This decapping action produces a novel cyclic ADP ribose RNA variant, expanding the known NAD-RNA landscape.
Area of Science:
- Biochemistry
- Molecular Biology
- RNA Biology
Background:
- NAD+-modified RNAs (NAD-RNAs) are a recently identified class of RNA modifications.
- Several enzymes are known to remove these NAD-RNA caps.
Purpose of the Study:
- To identify novel enzymes capable of decapping NAD-RNAs.
- To characterize the products of this decapping reaction.
Main Methods:
- Investigated the enzymatic activity of bacterial and archaeal Toll/interleukin-1 receptor (TIR) domain-containing proteins.
- Analyzed the products generated from NAD-RNA decapping by TIR domain proteins.
Main Results:
- Toll/interleukin-1 receptor (TIR) domain proteins from bacteria and Archaea were found to decap NAD-RNAs.
- The decapping activity of TIR proteins generates a specific variant of cyclic ADP ribose-RNAs (v-cADPR-RNAs).
Conclusions:
- TIR domain-containing proteins represent a new class of enzymes that modify the NAD-RNA landscape.
- The discovery of v-cADPR-RNAs opens new avenues for understanding RNA modification and function.
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