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The lectin-like NK cell receptor Ly-49A recognizes a carbohydrate-independent epitope on its MHC class I ligand

N Matsumoto1, R K Ribaudo, J P Abastado

  • 1Howard Hughes Medical Institute, Rheumatology Division, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Immunity
|March 10, 1998
PubMed

Insights

The Ly-49A receptor recognizes MHC class I (H-2Dd) through a carbohydrate-independent mechanism, distinct from its known interaction with carbohydrates like fucoidan. This suggests Ly-49A has dual ligand-binding capabilities.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • The mouse NK inhibitory Ly-49A receptor is known to interact with MHC class I H-2Dd.
  • Ly-49A's C-type lectin homology suggests potential carbohydrate interactions with H-2Dd.

Purpose of the Study:

  • To investigate the precise binding mechanism of Ly-49A to its MHC class I ligand, H-2Dd.
  • To determine if Ly-49A's interaction with H-2Dd is carbohydrate-dependent or independent.

Main Methods:

  • Analysis of Ly-49A binding to H-2Dd mutants lacking N-glycosylation.
  • Competition assays using fucoidan and anti-Ly-49A antibodies.
  • Examination of recombinant H-2Kd-H-2Dd molecules to map binding domains.

Main Results:

  • Ly-49A recognizes H-2Dd even when N-glycosylation is absent.
  • Fucoidan competes with Ly-49A for binding to H-2Dd and blocks binding to unglycosylated H-2Dd.
  • Ly-49A specifically recognizes the alpha1 and amino-terminal alpha2 domains of H-2Dd.

Conclusions:

  • Ly-49A interacts with H-2Dd through carbohydrate-independent epitope(s).
  • Ly-49A possesses distinct binding sites for carbohydrates and MHC class I molecules.
  • This dual specificity broadens the understanding of NK cell receptor-ligand interactions.

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