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Updated: Jun 16, 2026

Examining BCL-2 Family Function with Large Unilamellar Vesicles

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Evaluating bistability of Bax activation switch.

Tingzhe Sun¹, Xuzhu Lin, Yinna Wei

¹State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, People's Republic of China.

|January 26, 2010

Summary

The BCL-2 family controls cell death through a bistable switch. Bax activation occurs in an

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Area of Science:

Molecular Biology
Cell Biology
Biophysics

Background:

The intrinsic apoptotic pathway is critical for cellular homeostasis.
The BCL-2 protein family regulates mitochondrial outer membrane permeabilization.
The precise mechanism of BCL-2 family interactions forming a bistable switch is not fully understood.

Purpose of the Study:

To investigate the bistability of the Bax activation switch.
To elucidate the 'all-or-none' nature of Bax activation.
To explore the theoretical underpinnings of Bax activation dynamics.

Main Methods:

Combined experimental and theoretical approaches.
Analysis of protein interactions within the BCL-2 family.
Computational modeling of the Bax activation switch.

Main Results:

Bax activation operates in an 'all-or-none' manner.
The activation exhibits a 'variable-delay, snap-action' characteristic.
Bistability is robust and linked to topological structure.

Conclusions:

The study characterizes the dynamics and sensitivities of the intrinsic apoptotic pathway.
Bistability in Bax activation is a key feature of the apoptotic switch.
Understanding this switch provides insights into programmed cell death regulation.