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Dynamic interplay between adhesive and lateral E-cadherin dimers.
Jörg Klingelhöfer1, Oscar Y Laur, Regina B Troyanovsky
1Division of Dermatology, Washington University Medical School, St. Louis, Missouri 63110, USA.
Molecular and Cellular Biology
|October 9, 2002
Summary
E-cadherin forms adhesive and lateral dimers, crucial for cell adhesion. Calcium levels dynamically regulate these E-cadherin dimer forms, suggesting a cycling mechanism for cell-cell connections.
Area of Science:
- Cell Biology
- Biochemistry
- Structural Biology
Background:
- E-cadherin is a key transmembrane protein in epithelial adherens junctions.
- It forms detergent-resistant adhesive and lateral dimers, both dependent on Trp156 residue.
Purpose of the Study:
- To investigate the prevalence and regulation of E-cadherin dimer forms.
- To elucidate the role of calcium in E-cadherin dimer dynamics and cell adhesion.
Main Methods:
- Analysis of E-cadherin dimer formation in A-431 epithelial cells.
- Investigating dimer changes upon inactivation of calcium-binding sites.
- Studying dimer dynamics in digitonin-permeabilized cells with varying calcium concentrations.
Main Results:
- Adhesive dimers appear prevalent in A-431 cells.
- Calcium levels critically influence the balance between adhesive and lateral dimers.
- Lowering calcium disassembles adhesive dimers, increasing lateral dimers; restoring calcium reverses this.
- E-cadherin dimers exhibit short in vivo lifetimes.
Conclusions:
- E-cadherin-mediated adhesion relies on dynamic cycling between monomeric and adhesive dimer states.
- Calcium concentration is a key regulator of E-cadherin dimer dynamics and cell adhesion.