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Related Experiment Videos

Membrane-proximal {alpha}/{beta} stalk interactions differentially regulate integrin activation.

Tetsuji Kamata1, Makoto Handa, Yukiko Sato

  • 1Departments of Anatomy, Transfusion Medicine and Cell Therapy, and Internal Medicine, Keio University School of Medicine, Tokyo 160-8582, Japan. kamata@sc.itc.keio.ac.jp

The Journal of Biological Chemistry
|May 3, 2005
PubMed
Summary
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Integrin stalk interactions regulate cell signaling. The alphaV calf-2 domain uniquely impacts Mn(2+)-induced activation of integrin alphaIIbbeta3, revealing a novel switch mechanism for bidirectional signaling.

Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • Integrin-ligand binding affinity is modulated by extracellular divalent cations and intracellular signals.
  • Membrane-proximal alpha/beta stalk interactions are crucial for integrin activation and signal propagation.

Purpose of the Study:

  • To investigate the role of extracellular stalk interactions in regulating integrin activation by divalent cations and inside-out signaling.
  • To identify specific domains responsible for differential cation responses between integrins alphaIIbbeta3 and alphaVbeta3.

Main Methods:

  • Utilized domain-swapping chimeras between integrins alphaIIb and alphaV.
  • Constructed alphaIIb/alphaV domain-swapping chimeras to pinpoint critical regions.
  • Introduced disulfide bridges to constrain specific protein interfaces.

Related Experiment Videos

  • Mutated key amino acid residues at the calf-2/beta tail domain interface.

    • Main Results:

    • The alpha stalk region, not the head, dictates differential Mn(2+) responses between alphaIIbbeta3 and alphaVbeta3.
    • The alphaV calf-2 domain alone conferred Mn(2+) sensitivity to alphaIIbbeta3, despite lacking cation-binding sites.
    • Disrupting the stalk interface with disulfide bridges impaired cation-induced binding and abrogated signaling-induced binding.

    Conclusions:

    • The membrane-proximal alpha/beta stalk interface acts as a critical regulator of integrin activation and bidirectional signaling.
    • Specific domains within the stalk, like the alphaV calf-2 domain, can act as switches controlling integrin responses.
    • Targeting these stalk interactions offers potential for modulating integrin-mediated cellular processes.