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Structural basis of collagen recognition by integrin alpha2beta1.
J Emsley1, C G Knight, R W Farndale
1Department of Biochemistry, University of Leicester, United Kingdom.
Cell
|April 25, 2000
Summary
We determined the crystal structure of integrin alpha2beta1
Area of Science:
- Structural biology
- Molecular interactions
- Cell adhesion
Background:
- Integrins are crucial cell surface receptors mediating cell-matrix and cell-cell adhesion.
- Integrin alpha2beta1 specifically binds to collagen, playing roles in platelet aggregation and tissue remodeling.
- Understanding the molecular basis of this interaction is key to deciphering cell signaling pathways.
Purpose of the Study:
- To elucidate the structural basis of the interaction between the integrin alpha2beta1 I domain and collagen.
- To identify the key residues and structural rearrangements involved in ligand binding and signal transduction.
Main Methods:
- X-ray crystallography to determine the complex structure.
- Structural comparison of the liganded and unliganded integrin I domain.
- Analysis of metal ion coordination and surface complementarity.
Main Results:
- The crystal structure of the integrin alpha2beta1 I domain complexed with a collagen peptide (GFOGER motif) was determined.
- Specific loops on the I domain coordinate a metal ion, engaging the collagen.
- Collagen glutamate completes the metal coordination sphere, inducing conformational changes in the I domain.
Conclusions:
- The observed structural rearrangements create a complementary binding surface for collagen.
- Conformational changes propagate through the I domain, suggesting mechanisms for affinity regulation and signal transduction.
- These findings may represent a general mechanism for integrin-ligand recognition.
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