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Related Experiment Videos

Are changes in integrin affinity and conformation overemphasized?

G Bazzoni1, M E Hemler

  • 1Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.

Trends in Biochemical Sciences
|March 28, 1998
PubMed
Summary
This summary is machine-generated.

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Integrin activation does not always increase ligand binding. Major conformational changes in integrins occur after ligand binding, not during activation, challenging current understandings of cell adhesion.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Structural Biology

Background:

  • Integrin-type adhesion receptors mediate cell adhesion by binding extracellular matrix ligands.
  • Integrin activation is often associated with increased ligand-binding affinity and altered receptor conformation.
  • New epitopes on activated integrins are clinically relevant biomarkers.

Purpose of the Study:

  • To investigate the relationship between integrin activation and ligand-binding affinity.
  • To clarify the timing of dominant conformational changes in integrins relative to activation and ligand binding.
  • To provide examples where integrin activation is not coupled with enhanced ligand binding.

Main Methods:

  • Review of existing literature and experimental data on integrin activation.

Related Experiment Videos

  • Analysis of structural and functional studies of integrin receptors.
  • Case studies illustrating specific integrin activation scenarios.

    • Main Results:

    • Identified instances where integrin activation does not lead to increased ligand binding.
    • Demonstrated that significant integrin conformational changes predominantly occur post-ligand binding.
    • Highlighted that 'activation' can be a complex process not solely defined by ligand affinity.

    Conclusions:

    • Integrin activation is not universally synonymous with enhanced ligand binding.
    • The major structural rearrangements of integrins follow ligand engagement.
    • Clinical monitoring of integrin epitopes should consider these nuances in activation states.