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Related Experiment Videos

A specific interface between integrin transmembrane helices and affinity for ligand.

Bing-Hao Luo1, Timothy A Springer, Junichi Takagi

  • 1Center for Blood Research, Institute for Biomedical Research and Department of Pathology, Harvard Medical School, Boston, Massachusetts, USA.

Plos Biology
|June 23, 2004
PubMed
Summary
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Integrin transmembrane domains separate during activation, transmitting signals. This lateral helix separation, not hinging, is key to integrin signaling across the plasma membrane.

Area of Science:

  • Cell biology
  • Structural biology
  • Biochemistry

Background:

  • Integrins are crucial cell surface receptors mediating cell-matrix and cell-cell adhesion.
  • Understanding integrin signal transmission across the plasma membrane is vital for cell communication.
  • The specific roles of integrin transmembrane domains in signaling remain largely unknown.

Purpose of the Study:

  • To investigate the role of integrin alpha and beta subunit transmembrane domains in signal transmission.
  • To elucidate the mechanism of conformational communication across the plasma membrane in integrins.

Main Methods:

  • Disulfide bond scanning of the exofacial portions of integrin alpha(IIb) and beta(3) transmembrane domains.
  • Utilizing cytoplasmic mutations to mimic physiologic inside-out activation.

Related Experiment Videos

  • Introducing disulfide bridges to modulate transmembrane domain separation.

    • Main Results:

    • A specific heterodimerization interface was identified in the resting integrin alpha(IIb)beta(3) transmembrane domains.
    • This interface is lost upon receptor activation, indicating lateral separation of transmembrane helices.
    • Preventing or reversing this separation abolished the activating effect of cytoplasmic mutations.

    Conclusions:

    • Integrin transmembrane domain separation, not hinging or piston-like motions, is the primary mechanism for transmembrane signaling.
    • This lateral separation links extracellular domain activation to intracellular signal transduction.
    • Structural insights into integrin transmembrane domain interactions are crucial for understanding cell adhesion and signaling.