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Updated: Nov 19, 2025
11:34
Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
Published on: August 9, 2019
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In vitro selected GUAA tetraloop-binding receptors with structural plasticity and evolvability towards natural RNA
Paul Zakrevsky1, Erin Calkins1, Yi-Ling Kao1
1Department of Chemistry and Biochemistry, Biomolecular Science and Engineering Program, University of California, Santa Barbara, CA 93106-9510, USA.
Nucleic Acids Research
|February 1, 2021
Summary
Researchers discovered novel GUAA receptors that bind RNA with high affinity, expanding the known interactions for GNRA (G, N, R, A) tetraloops. These findings suggest a broader repertoire of RNA interactions and offer insights into their evolutionary pathways.
Area of Science:
- Molecular Biology
- RNA Structure and Dynamics
- Biochemistry
Background:
- GNRA tetraloop-receptor interactions are crucial for RNA macromolecular assembly.
- Natural RNA interactions show a bias towards GAAA/11nt receptors, which are more stable than GYRA/helix interactions.
Purpose of the Study:
- To identify novel RNA receptors with specific binding affinities for GNRA tetraloops.
- To explore the structural and evolutionary implications of newly discovered GNRA/receptor interactions.
Main Methods:
- In vitro selection assays to isolate novel RNA receptors.
- High-throughput sequencing to analyze mutation effects on RNA assembly fitness.
- Structural homology analysis with known RNA modules.
Main Results:
- Identification of several novel classes of GUAA receptors with binding affinities comparable to natural GAAA/11nt interactions.
- Observed structural homology of these GUAA receptors to double-locked bulge RNA modules in ribosomal RNAs.
- Demonstrated mutational robustness and identified synergistic mutations enhancing RNA assembly fitness.
Conclusions:
- The repertoire of GNRA/receptor interactions is larger than previously understood from natural RNA molecules.
- Newly discovered GUAA receptors provide insights into the evolution of natural GNRA/receptor interactions.
- These findings expand the understanding of RNA-RNA interactions and their functional diversity.
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