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Related Experiment Videos

Primary structure of the canine CD4 antigen

K F Milde1, G E Conner, D H Mintz

  • 1Department of Medicine, University of Miami, FL.

Biochimica Et Biophysica Acta
|March 20, 1993
PubMed
Summary
This summary is machine-generated.

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Researchers identified dog CD4 glycoprotein cDNA clones, revealing unique structural differences in the second extracellular domain compared to human CD4. This finding offers insights into canine immune system variations.

Area of Science:

  • Immunology
  • Molecular Biology
  • Canine Genetics

Background:

  • The CD4 glycoprotein is a crucial co-receptor in adaptive immunity, playing a vital role in T-cell activation.
  • Understanding species-specific CD4 variations is essential for comparative immunology and developing targeted therapies.

Purpose of the Study:

  • To identify and characterize the dog homologue of the human CD4 glycoprotein.
  • To analyze the structural differences between canine and human CD4 molecules.

Main Methods:

  • Polymerase Chain Reaction (PCR) amplification of cDNA.
  • Identification and sequencing of overlapping cDNA clones encoding the dog CD4 glycoprotein.

Main Results:

  • Two overlapping cDNA clones for the dog CD4 glycoprotein were successfully identified.

Related Experiment Videos

  • The deduced amino acid sequence revealed a 432-residue protein with complete extracellular domains.
  • Significant differences were observed in the second extracellular domain of the dog CD4 compared to other species, including nine extra residues, a cysteine-to-tryptophan substitution at position 138, and three novel glycosylation sites.

    • Conclusions:

    • The canine CD4 molecule exhibits unique structural features, particularly in its second extracellular domain.
    • These structural variations may influence the function and interactions of CD4 in dogs.
    • Further research is warranted to explore the functional implications of these canine-specific CD4 modifications.