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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
Published on: October 17, 2014
Allosteric cross talk between cadherin extracellular domains
Quanming Shi1, Venkat Maruthamuthu, Fang Li
1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA.
Biophysical Journal
|July 27, 2010
Summary
Cadherin mutations impact cell binding by altering multiple bond interactions. The W2A mutation disrupts adhesion and affects distant binding sites through allosteric modulation.
Area of Science:
- Biophysics
- Molecular Biology
- Cell Adhesion
Background:
- Cadherins are crucial cell adhesion molecules involved in tissue development and homeostasis.
- Understanding cadherin binding mechanisms is essential for deciphering cell-cell interactions.
- Specific mutations can significantly alter cadherin function and adhesion properties.
Purpose of the Study:
- To investigate the functional consequences of specific cadherin mutations on binding characteristics.
- To compare the efficacy of Atomic Force Microscopy (AFM) and Surface Force Apparatus (SFA) in analyzing cadherin interactions.
- To elucidate the role of interdomain crosstalk and allosteric effects in cadherin-mediated adhesion.
Main Methods:
- Utilized Atomic Force Microscopy (AFM) and Surface Force Apparatus (SFA) to measure C-cadherin binding.
- Introduced a point mutation (W2A) and domain deletion mutations in C-cadherin.
- Analyzed binding signatures to assess the impact of mutations on adhesion.
Main Results:
- Both AFM and SFA revealed that C-cadherin ectodomains form multiple, independent bonds requiring distinct structural regions.
- Significant interdomain crosstalk was observed in C-cadherin binding.
- The W2A mutation not only abolished N-terminal domain adhesion but also allosterically modulated distal binding sites.
Conclusions:
- Cadherin binding involves complex interactions with significant interdomain crosstalk.
- Allosteric modulation by mutations like W2A can profoundly impact cadherin adhesion.
- These findings offer insights into cadherin oligomerization, junctional stability, and signal propagation.
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