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Exploring Catechol Binding to Laccase with Insights into Enzyme Dynamics for Biosensing Applications
Anushka Biswas1, Mithun Radhakrishna1,2
1Department of Chemical Engineering, Indian Institute of Technology (IIT) Gandhinagar, Palaj, Gujarat 382355, India.
The Journal of Physical Chemistry. B
|March 24, 2025
Summary
Researchers used advanced simulations to reveal how the enzyme laccase binds to the toxic pollutant catechol. This work uncovers key mechanisms for developing better biosensors and bioreactors for environmental cleanup.
Area of Science:
- Biochemistry and Environmental Science
- Enzymology and Molecular Modeling
Background:
- Enzymatic sensors and bioreactors show promise for toxic compound detection and removal.
- Phenolic pollutants, such as catechol, pose significant environmental risks.
- Laccase is a key enzyme for catechol degradation due to its high binding affinity.
Purpose of the Study:
- To elucidate the atomic-level binding mechanism of catechol to laccase from Trametes versicolor.
- To identify critical transition states and pathways governing this interaction.
- To provide insights for designing enhanced enzymatic systems.
Main Methods:
- Molecular dynamics simulations
- Free-energy calculations
- Markov state modeling (MSM)
- Transition path theory (TPT)
Main Results:
- Identification of five distinct macrostates characterizing the laccase-catechol binding landscape.
- Characterization of critical transition states involving the active site loop and a gate mechanism.
- Quantification of two dominant pathways for catechol binding via sequential conformational changes.
Conclusions:
- The study provides unprecedented atomic-level detail on laccase-catechol binding.
- Key structural elements and dynamic pathways governing substrate entry were identified.
- Findings support the rational design of laccase-based biosensors and bioremediation strategies.
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