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Nanomanipulation of Single RNA Molecules by Optical Tweezers
Published on: August 20, 2014
Linkage between proton binding and folding in RNA: implications for RNA catalysis
P C Bevilacqua1, T S Brown, D Chadalavada
1Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA. pcb@chem.psu.edu
Biochemical Society Transactions
|May 27, 2005
Summary
Small ribozymes, like the hepatitis delta virus ribozyme, use nucleobases for catalysis. Folding and protonation linkage enhances RNA function by shifting nucleobase pKa values.
Area of Science:
- Biochemistry
- Molecular Biology
- RNA Catalysis
Background:
- Small ribozymes catalyze phosphodiester bond cleavage using nucleobases.
- The hepatitis delta virus ribozyme utilizes C75 for acid catalysis, requiring pKa shifting for efficiency.
Purpose of the Study:
- Investigate the mechanism of nucleobase pKa shifting in ribozymes.
- Explore the linkage between oligonucleotide folding and protonation.
- Understand how these processes enhance RNA function.
Main Methods:
- Computational simulations.
- Thermodynamic experiments.
Main Results:
- Simulations and experiments suggest a link between folding and protonation in nucleobase pKa shifting.
- Even small oligonucleotides exhibit cooperative folding in a context-specific manner.
- Linkage between protonation and folding cooperativity appears to drive pKa shifting.
Conclusions:
- The interplay between folding and protonation is crucial for efficient ribozyme catalysis.
- This linkage mechanism enhances the functional capabilities of RNA molecules.
- Understanding these principles can inform the design of novel RNA-based catalysts.
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