Related Experiment Video
Updated: Aug 14, 2025
09:26
Identifying the Binding Proteins of Small Ligands with the Differential Radial Capillary Action of Ligand Assay DRaCALA
Published on: March 19, 2021
3.6K
Identification and characterization of RNA binding sites for (p)ppGpp using RNA-DRaCALA.
Jonathan Jagodnik1, Brian Tjaden2, Wilma Ross1
1Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA.
Nucleic Acids Research
|January 9, 2023
Summary
Researchers developed RNA-DRaCALA, a rapid screening method for RNA aptamers. This technique efficiently identifies RNA aptamers that bind specific molecules like (p)ppGpp and thiamine pyrophosphate.
Area of Science:
- Molecular Biology
- Biochemistry
- RNA Biology
Background:
- RNA aptamers are crucial regulators in biological systems, sensing small molecules and controlling gene expression via riboswitches.
- Existing methods for validating computationally predicted RNA aptamers are often slow and unsuitable for high-throughput screening.
- The need for efficient biochemical validation techniques is critical for advancing our understanding of RNA function.
Purpose of the Study:
- To adapt the DRaCALA technique for studying RNA-ligand interactions, enabling rapid screening of numerous RNA aptamer candidates.
- To biochemically validate computationally predicted RNA aptamers targeting (p)ppGpp and thiamine pyrophosphate.
- To improve secondary structure modeling and identify key binding features of RNA aptamers.
Main Methods:
- Adaptation of Differential Radial Capillary Action of Ligand Assay (DRaCALA) for RNA-ligand binding studies.
- Concurrent screening of dozens of RNA aptamer candidates using the RNA-DRaCALA technique.
- Biochemical validation of 30 ykkC family subtype 2a RNA aptamers for (p)ppGpp binding and analysis of thiamine pyrophosphate aptamer interactions.
Main Results:
- RNA-DRaCALA enabled rapid, concurrent screening of multiple RNA aptamers, significantly improving validation efficiency.
- Screening of 30 ykkC family subtype 2a aptamers revealed varied binding affinities for ppGpp and pppGpp, with some showing ligand specificity.
- The study successfully demonstrated RNA-DRaCALA's versatility by analyzing thiamine pyrophosphate aptamer binding.
Conclusions:
- RNA-DRaCALA is a powerful and efficient method for the biochemical validation and screening of RNA aptamers and their ligands.
- The study identified specific RNA aptamers with distinct binding preferences for ppGpp and pppGpp, aiding in the development of more accurate structural models.
- The successful application to thiamine pyrophosphate binding underscores the broad utility of RNA-DRaCALA in RNA-ligand interaction studies.
