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Related Experiment Videos

A molecular basis for integrin alphaMbeta 2 ligand binding promiscuity.

Valentin P Yakubenko1, Valeryi K Lishko, Stephen C-T Lam

  • 1Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic Foundation, Ohio 44195, USA.

The Journal of Biological Chemistry
|October 16, 2002
PubMed
Summary

A specific segment from the alpha(M)beta(2) integrin, when grafted onto alpha(L)beta(2), conferred broad ligand-binding capabilities. This suggests the alpha(M)(Lys(245)-Arg(261)) sequence acts as a key determinant for promiscuous leukocyte receptor recognition.

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Area of Science:

  • Molecular biology
  • Immunology
  • Cell biology

Background:

  • Leukocyte integrin alpha(M)beta(2) exhibits broad ligand recognition.
  • Understanding the molecular basis of this promiscuity is crucial for immunology.

Purpose of the Study:

  • To identify the molecular determinants responsible for alpha(M)beta(2)'s broad ligand binding.
  • To investigate the role of the alpha(M)I domain in mediating interactions with diverse ligands.

Main Methods:

  • Creation of an inter-integrin chimera by inserting the alpha(M)(Lys(245)-Arg(261)) segment into alpha(L)beta(2).
  • Expression of the chimeric integrin in HEK 293 cells.
  • Characterization of cell adhesion and migration to fibrinogen and other ligands.

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Main Results:

  • The chimeric integrin successfully bound fibrinogen and supported cell migration, mimicking wild-type alpha(M)beta(2) function.
  • Mutations within the inserted alpha(M) segment significantly reduced ligand binding, highlighting key residues.
  • The chimera recognized multiple alpha(M)beta(2) ligands and adhered to uncoated plastic, a characteristic of alpha(M)beta(2).

Conclusions:

  • The alpha(M)(Lys(245)-Arg(261)) sequence acts as a consensus binding site, conferring promiscuous recognition properties to integrins.
  • This segment is critical for the degenerate binding capabilities of the alpha(M)beta(2) integrin.