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Identification of amino acid residues important for ligand binding to Fas

G C Starling1, J Bajorath, J Emswiler

  • 1Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, Washington 98121, USA.

The Journal of Experimental Medicine
|April 21, 1997
PubMed

Insights

Identifying key amino acid residues in Fas (CD95) is crucial for understanding its interaction with Fas ligand (FasL). This study pinpoints specific residues in Fas extracellular domains essential for FasL binding and apoptosis signaling.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The Fas/FasL pathway is critical for apoptosis and immune regulation.
  • Understanding the molecular basis of Fas-FasL interaction is essential for deciphering its biological roles.

Purpose of the Study:

  • To identify specific amino acid residues within the Fas extracellular domain crucial for Fas ligand (FasL) binding.
  • To elucidate the molecular mechanisms underlying Fas-FasL interaction.

Main Methods:

  • Serine-scanning mutagenesis was employed to generate mutant Fas molecules.
  • Fas Ig fusion proteins were used to assess FasL binding.
  • Assays included inhibition of FasL-mediated apoptosis, ELISA, and BIAcore analysis.

Main Results:

  • Mutations R86S and R87S in Fas extracellular domain 2 (D2) completely abolished FasL binding.
  • Mutations K84S, L90S, E93S (D2), and H126S (D3) significantly reduced FasL binding.
  • Residues R86, R87, K84, L90, E93, and H126 are important for Fas-FasL interaction.

Conclusions:

  • Specific residues in Fas extracellular domains D2 and D3 are critical for FasL binding.
  • These findings provide insights into the conserved mechanisms of ligand binding within the tumor necrosis factor receptor superfamily.

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