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Structural analysis of the murine cell adhesion molecule L1 by electron microscopy and computer-assisted modelling
B Drescher1, E Spiess, M Schachner
1Molekulare Biophysik 1, Deutsches Krebsforschungszentrum, Heidelberg, Germany.
The European Journal of Neuroscience
|December 1, 1996
Summary
Researchers analyzed the murine neural cell adhesion molecule L1 fragments (L1-180 and L1-140), revealing fibrillar structures with a globular domain. Molecular modeling suggests carbohydrate interactions, not protein-protein interactions, form this domain.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- The neural cell adhesion molecule L1 is crucial for nervous system development.
- Understanding L1's structure is key to deciphering its function in cell adhesion and signaling.
Purpose of the Study:
- To analyze the morphology and structural properties of two fragments of the murine L1 molecule.
- To investigate the molecular interactions responsible for L1's structural organization.
Main Methods:
- Electron microscopy of rotary-shadowed L1 fragments (L1-180 and L1-140).
- Complex formation with L1 antibodies.
- Computer-assisted modeling of the L1 protein backbone.
Main Results:
- L1 fragments exhibit fibrillar structures (31-43 nm long) with a distinct globular terminal domain.
- The globular domain is primarily formed by fibronectin type III-like domains.
- Molecular modeling indicates carbohydrate-carbohydrate or protein-carbohydrate interactions, rather than protein-protein interactions, are crucial for globular domain formation.
Conclusions:
- The L1 molecule likely adopts a helical structure, with observed variations representing different 2D projections.
- Carbohydrate interactions play a significant role in the structural integrity of the L1 molecule's globular domain.
- Conserved residues at domain interfaces suggest a role in maintaining domain orientation and overall molecular structure.