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Related Experiment Videos

Conformational regulation of integrin structure and function.

Motomu Shimaoka1, Junichi Takagi, Timothy A Springer

  • 1The Center for Blood Research, Department of Pathology and Anesthesia, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.

Annual Review of Biophysics and Biomolecular Structure
|May 4, 2002
PubMed
Summary
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Integrins are cell adhesion proteins. Their ligand-binding I domain switches between closed (low affinity) and open (high affinity) states, enabling rapid cell signaling and adhesion regulation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Integrins are crucial cell surface receptors mediating cell adhesion.
  • The ligand-binding specificity of integrins relies on their divalent cation-dependent interactions.
  • The inserted (I) domain is present in a subset of integrins and is critical for ligand binding.

Purpose of the Study:

  • To elucidate the structural basis of integrin activation and ligand binding.
  • To investigate the conformational changes within the integrin I domain during activation.
  • To understand the mechanism linking intracellular signals to changes in integrin affinity.

Main Methods:

  • Structural determination of integrin I domains in different conformations (open and closed).
  • Site-directed mutagenesis to stabilize specific conformational states.

Related Experiment Videos

  • Functional assays to measure ligand-binding affinity.

    • Main Results:

    • Integrin I domains exist in distinct open (high-affinity) and closed (low-affinity) conformations.
    • Conformational changes, including a 10 Å movement of the C-terminal alpha-helix, are linked to Mg(2+)-binding site rearrangement.
    • Stabilizing the open conformation significantly increases ligand-binding affinity (up to 9000-fold).
    • A switchblade-like motion of the integrin headpiece upon activation is linked to I domain conformational changes.

    Conclusions:

    • The I domain's conformational state directly dictates integrin ligand-binding affinity.
    • The C-terminal alpha-helix acts as a "bell-rope" transmitting conformational changes across the integrin molecule.
    • Fast integrin activation involves coordinated structural rearrangements from the I domain to the entire receptor, enabling rapid cellular responses.