Complex disruption effect of natural polyphenols on Bcl-2-Bax: molecular dynamics simulation and essential dynamics study
Related Experiment Video
Updated: Apr 28, 2026
Examining BCL-2 Family Function with Large Unilamellar Vesicles
Published on: October 5, 2012
Sharad Verma1, Amit Singh, Abha Mishra
1a School of Biochemical Engineering , Indian Institute of Technology (Banaras Hindu University) , Varanasi 221005 , India.
Abstract:
Apoptosis (programmed cell death) is a process by which cells died after completing physiological function or after a severe genetic damage. Apoptosis is mainly regulated by the Bcl-2 family of proteins. Anti apoptotic protein Bcl-2 prevents the Bax activation/oligomerization to form heterodimer which is responsible for release of the cytochrome c from mitochondria to the cytosol in response to death signal. Quercetin and taxifolin (natural polyphenols) efficiently bound to hydrophobic groove of Bcl-2 and altered the structure by inducing conformational changes. Taxifolin was found more efficient when compared to quercetin in terms of interaction energy and collapse of hydrophobic groove. Taxifolin and quercetin were found to dissociate the Bcl-2-Bax complex during 12 ns MD simulation. The effect of taxifolin and quercetin was, further validated by the MD simulation of ligand-unbound Bcl-2-Bax which showed stability during the simulation. Obatoclax (an inhibitor of Bcl-2) had no significant dissociation effect on Bcl-2-Bax during simulation which favored the previous experimental results and disruption effect of taxifolin and quercetin.
Insights
Natural compounds quercetin and taxifolin disrupt the Bcl-2-Bax complex, a key regulator of apoptosis (programmed cell death). Taxifolin shows greater efficacy in altering Bcl-2 structure and function.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Apoptosis, or programmed cell death, is crucial for physiological function and preventing damage.
- The Bcl-2 protein family regulates apoptosis.
- Anti-apoptotic protein Bcl-2 inhibits Bax activation, preventing cytochrome c release from mitochondria.
Purpose of the Study:
- To investigate the interaction of natural polyphenols, quercetin and taxifolin, with Bcl-2.
- To determine the effect of these compounds on the Bcl-2-Bax complex.
- To compare the efficacy of quercetin and taxifolin in modulating Bcl-2 activity.
Main Methods:
- Molecular dynamics (MD) simulations were used to study the binding of quercetin and taxifolin to Bcl-2.
- The dissociation of the Bcl-2-Bax complex induced by these compounds was analyzed using MD simulations.
- Control simulations with ligand-unbound Bcl-2-Bax and the inhibitor obatoclax were performed.
Main Results:
- Quercetin and taxifolin bind to the hydrophobic groove of Bcl-2, inducing conformational changes.
- Taxifolin demonstrated higher interaction energy and greater collapse of the hydrophobic groove compared to quercetin.
- Both compounds effectively dissociated the Bcl-2-Bax complex during 12 ns MD simulations.
- The Bcl-2-Bax complex remained stable without quercetin or taxifolin.
- Obatoclax, a Bcl-2 inhibitor, did not significantly affect the Bcl-2-Bax complex stability.
Conclusions:
- Quercetin and taxifolin can disrupt the Bcl-2-Bax complex, suggesting a role in apoptosis regulation.
- Taxifolin is a more potent modulator of Bcl-2 structure and function than quercetin.
- These findings support the potential of natural polyphenols as therapeutic agents targeting apoptosis pathways.
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