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Related Experiment Videos

High affinity ligand binding by integrins does not involve head separation.

Bing-Hao Luo1, Timothy A Springer, Junichi Takagi

  • 1Center for Blood Research, Harvard Medical School, Boston, Massachusetts 02115, USA.

The Journal of Biological Chemistry
|February 26, 2003
PubMed
Summary
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Integrin headpiece separation is not required for ligand binding or activation. Instead, ligand binding stabilizes the association between integrin alpha and beta subunits at the headpiece.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Structural Biology

Background:

  • Integrin function relies on conformational changes in their extracellular domains, influencing ligand binding and cellular signaling.
  • A prevailing hypothesis suggests integrin activation involves alpha- and beta-subunit dissociation in the headpiece upon ligand binding.
  • Electron microscopy studies have supported the head separation hypothesis, impacting the understanding of integrin activation mechanisms.

Purpose of the Study:

  • To directly test the head separation hypothesis of integrin activation.
  • To investigate the role of integrin headpiece subunit association in ligand binding and activation.
  • To elucidate the conformational regulation mechanisms of integrin function.

Main Methods:

  • Engineered disulfide bonds to enforce headpiece association between alpha and beta subunits in integrins alpha(IIb)beta(3) and alpha(V)beta(3).

Related Experiment Videos

  • Assessed basal and activation-dependent ligand binding affinities.
  • Utilized EDTA treatment and ligand-mimetic peptides (Arg-Gly-Asp) to evaluate subunit dissociation and association.
  • Analyzed headpiece fragment association in SDS using specific antibodies.

    • Main Results:

    • Enforced headpiece association did not affect basal or activation-dependent ligand binding.
    • Covalent linkage prevented EDTA-induced alpha(IIb)beta(3) dissociation.
    • Ligand-mimetic compounds stabilized noncovalent association between alpha(IIb) and beta(3) headpiece fragments.
    • Ligand binding was found to stabilize, not dissociate, subunit association at the integrin headpiece.

    Conclusions:

    • Integrin headpiece separation is not a prerequisite for high-affinity ligand binding or activation.
    • Ligand binding stabilizes the associated state of the integrin alpha and beta subunits at the headpiece.
    • Integrin conformational regulation should be understood within the context of a stably associated alphabeta headpiece.