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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
Published on: October 17, 2014
Forced dissociation of the strand dimer interface between C-cadherin ectodomains
M V Bayas1, K Schulten, D Leckband
1Center for Biophysics and Computational Biology, UIUC, Urbana, IL, USA.
Mechanics & Chemistry of Biosystems : MCB
|June 21, 2006
Summary
Force-induced dissociation of C-cadherin dimers involves extracting conserved tryptophans (Trp2). This process, studied via molecular dynamics, reveals key intermediate states and mutant behaviors, confirming tryptophan
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biology
Background:
- Cadherins mediate cell-cell adhesion, crucial for tissue integrity.
- C-cadherin's strand dimer interface is vital for its adhesive function.
- Conserved tryptophans (Trp2) are implicated in C-cadherin stability.
Purpose of the Study:
- To investigate the mechanism of force-induced dissociation at the C-cadherin strand dimer interface.
- To elucidate the role of conserved tryptophans (Trp2) in C-cadherin complex stability and dissociation.
Main Methods:
- Steered molecular dynamics (SMD) simulations were employed.
- Simulations analyzed wild-type C-cadherin and W2A mutants.
- Force-induced dissociation pathways were computationally modeled.
Main Results:
- Dissociation occurred without domain unraveling, initiated by Trp2 extraction from hydrophobic pockets.
- Two stable positions for Trp2 were identified within the pocket, one involving a hydrogen bond with Glu90.
- An intermediate bound state was observed, characterized by Trp2 association with Asp1 and Asp27 residues.
- W2A mutants showed significantly easier dissociation compared to wild-type C-cadherin.
Conclusions:
- Conserved tryptophans (Trp2) play a critical role in stabilizing the C-cadherin dimer interface.
- The dissociation mechanism involves sequential breaking of interactions, including Trp2 pocket binding and Trp2-Asp associations.
- Simulation findings align with previous site-directed mutagenesis studies on the role of conserved tryptophans.
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