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Purification and characterization of integrin alpha 9 beta 1
1Department of Medical and Physiological Chemistry, University of Uppsala, Sweden.
Experimental Cell Research
|July 1, 1994
Summary
Researchers identified a novel integrin, alpha 9 beta 1, in rat liver. This new integrin binds to laminin and collagen, suggesting a role as a key cell adhesion receptor.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Integrins are crucial cell surface receptors mediating cell adhesion.
- Specific integrin subunits dictate ligand binding and cellular responses.
- Characterization of novel integrins is essential for understanding cell-matrix interactions.
Purpose of the Study:
- To isolate and characterize a novel beta 1-containing integrin from rat liver.
- To determine the ligand-binding properties and tissue distribution of the new integrin.
Main Methods:
- Affinity chromatography using a GRGDSPC peptide and Sepharose.
- N-terminal and internal peptide sequencing for protein identification.
- Antibody-based detection and tissue distribution analysis.
- Binding assays with immobilized extracellular matrix proteins (laminin, collagen).
Main Results:
- A new integrin, designated alpha 9 beta 1, was isolated and identified.
- The alpha 9 subunit shares sequence homology but is distinct from known integrin alpha subunits.
- Integrin alpha 9 beta 1 specifically binds to EHS-laminin and collagen type I.
- Binding sites were localized to specific fragments of laminin (E8) and collagen.
- The integrin is widely distributed across various tissues.
Conclusions:
- Alpha 9 beta 1 represents a novel integrin subunit with unique binding characteristics.
- This integrin functions as a laminin and collagen receptor.
- Its widespread distribution suggests significant physiological roles in cell adhesion and tissue organization.