Lifetime of ligand-receptor clusters under external force
Chih-Chao Tang1, Yi-Ping Chu, Hsuan-Yi Chen
1Department of Physics, Graduate Institute of Biophysics, and Center for Complex Systems, National Central University, Jhongli, Taiwan.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 1, 2008
Summary
Ligand-receptor cluster lifetime depends on force per bond. At high forces, larger clusters (N) don't last longer, but at critical forces, lifetime increases with cluster size.
Area of Science:
- Biophysics
- Materials Science
- Biochemistry
Background:
- Ligand-receptor interactions are crucial for cellular processes.
- The stability of these interactions under external forces is not fully understood.
- Adhesion clusters form from multiple ligand-receptor bonds.
Purpose of the Study:
- To develop a theoretical framework for the lifetime of ligand-receptor clusters under force.
- To investigate the relationship between cluster size (N) and lifetime (T) under varying forces (f).
- To identify critical force thresholds influencing cluster stability.
Main Methods:
- Theoretical modeling of ligand-receptor cluster dynamics.
- Analysis of cluster lifetime T(N,f) as a function of N and f.
- Calculation of free energy barriers along the dissociation path.
Main Results:
- A critical force per bond, f(c), was identified.
- Above f(c), cluster lifetime is independent of N.
- Below f(c), lifetime scales with N due to free energy barriers; at f(c), lifetime scales as N(1/3) due to bond fluctuations.
Conclusions:
- Adhesion clusters are more stable at lower forces with increasing bond numbers.
- At high forces, larger clusters do not offer increased stability and respond similarly to smaller ones.
- Understanding force-dependent cluster lifetime is key for biomolecular adhesion studies.
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