1Q5B: Lambda-Shaped Trans And Cis Interactions Of Cadherins Model Based On Fitting C-Cadherin (1l3w) To 3d Map Of Desmosomes Obtained By Electron Tomography

Citation:
Abstract
Cell adhesion by adherens junctions and desmosomes relies on interactions between cadherin molecules. However, the molecular interfaces that define molecular specificity and that mediate adhesion remain controversial. We used electron tomography of plastic sections from neonatal mouse skin to visualize the organization of desmosomes in situ. The resulting three-dimensional maps reveal individual cadherin molecules forming discrete groups and interacting through their tips. Fitting of an x-ray crystal structure for C-cadherin to these maps is consistent with a flexible intermolecular interface mediated by an exchange of amino-terminal tryptophans. This flexibility suggests a novel mechanism for generating both cis and trans interactions and for propagating these adhesive interactions along the junction.
PDB ID: 1Q5BDownload
MMDB ID: 24837
PDB Deposition Date: 2003/8/6
Updated in MMDB: 2012/10
Experimental Method:
electron microscopy
Resolution: 30  Å
Source Organism:
Similar Structures:
Biological Unit for 1Q5B: trimeric; determined by author
Molecular Components in 1Q5B
Label Count Molecule
Proteins (3 molecules)
3
Ep-cadherin
Molecule annotation
Chemicals (81 molecules)
1
33
2
12
3
36
* Click molecule labels to explore molecular sequence information.

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