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Elucidating the Self-cleavage Dynamics of Hairpin Ribozyme by Mode-decomposed Infrared Spectroscopy
Adnan Gulzar1, Jan Noetzel1, Harald Forbert2
1Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany.
The Journal of Physical Chemistry Letters
|August 30, 2023
Summary
This study introduces a new method using infrared (IR) spectra analysis to understand molecular changes during biocatalytic reactions like ribozyme self-cleavage. The findings help reveal detailed molecular mechanisms in biological catalysts.
Area of Science:
- Biochemistry
- Computational Chemistry
- Spectroscopy
Background:
- Biomolecular catalytic reactions are vital but difficult to study at the molecular level.
- Understanding reaction mechanisms requires detailed molecular insights.
Purpose of the Study:
- To develop a strategy for extracting molecular details from infrared (IR) spectral changes during biocatalysis.
- To correlate spectral changes with molecular dynamics in the self-cleavage of hairpin ribozyme.
Main Methods:
- Utilized ab initio simulations for hairpin ribozyme self-cleavage.
- Performed mode-decomposed infrared spectra analysis.
- Employed cosine similarity analysis to compare reactant and product IR spectra.
Main Results:
- Identified a valuable spectral range (800-1200 cm-1) for monitoring ribozyme self-cleavage.
- Showed that strongly shifting IR peaks correlate with structural dynamics, while minor shifts may not.
- Achieved near-quantitative agreement with experimental IR band libraries for nucleic acids.
Conclusions:
- The developed framework effectively correlates complex IR spectra with molecular-level changes in biocatalytic pathways.
- This approach provides a broadly applicable strategy for elucidating molecular mechanisms in biological catalysis.
- Highlights the utility of IR spectroscopy in understanding enzyme reaction dynamics.
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