Allosteric Regulation of E-Cadherin Adhesion

Area of Science:

• Cellular Biology
• Biochemistry
• Molecular Biology

Background:

• Cadherins are vital transmembrane proteins for maintaining intercellular cohesion and tissue integrity.
• Rapid regulation of cadherin adhesion is critical for dynamic tissue remodeling processes.
• Previous studies suggested allosteric regulation of cadherin adhesion, but experimental quantification was challenging.

Purpose of the Study:

• To quantitatively demonstrate the allosteric regulation of E-cadherin binding affinity.
• To investigate the role of p120(ctn) dephosphorylation in modulating E-cadherin function.
• To provide direct evidence for external influences on cadherin adhesion.

Main Methods:

• Measured kinetics of cadherin-mediated intercellular adhesion.
• Utilized activating anti-E-cadherin antibodies as a positive control.
• Employed Colo 205 cells expressing inactive E-cadherin to assess aggregation and affinity changes.

Main Results:

• Activating antibodies and p120(ctn) dephosphorylation quantitatively increased E-cadherin homophilic binding affinity.
• Four distinct treatments inducing Colo 205 cell aggregation and p120(ctn) dephosphorylation resulted in similar affinity increases.
• Demonstrated a direct link between p120(ctn) dephosphorylation and enhanced E-cadherin binding.

Conclusions:

• E-cadherin adhesion is allosterically regulated by its cytoplasmic binding partner, p120(ctn).
• Dephosphorylation of p120(ctn) directly enhances E-cadherin binding affinity.
• These findings offer a quantitative mechanism for how E-cadherin function is modulated during tissue remodeling.