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Carbohydrate recognition site of interleukin-2 in relation to cell proliferation

K Fukushima1, S Hara-Kuge, H Ideo

  • 1Department of Biochemistry, Sasaki Institute, 2-2 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.

The Journal of Biological Chemistry
|June 8, 2001
PubMed

Insights

Interleukin-2 (IL-2) dimers bind carbohydrates and activate T-cells. The Asn-26 residue is crucial for IL-2

Area of Science:

  • Immunology
  • Molecular Biology
  • Glycobiology

Background:

  • Interleukin-2 (IL-2) is a critical cytokine for immune system function.
  • IL-2 mediates its effects by binding to its receptor subunits (alpha, beta, gamma).
  • The initial binding involves a glycan and peptide sequence on the IL-2 receptor alpha-subunit.

Purpose of the Study:

  • To identify the specific carbohydrate-binding site of Interleukin-2 (IL-2).
  • To investigate the role of IL-2 dimerization in its biological activities.
  • To determine the involvement of specific amino acid residues in IL-2's carbohydrate recognition.

Main Methods:

  • Preparation of wild-type and point-mutated (35)S-IL-2 using in vitro transcription and translation.
  • Assessing spontaneous dimerization of IL-2.
  • Evaluating carbohydrate recognition and cell proliferation activities of wild-type and mutant IL-2.

Main Results:

  • Wild-type (35)S-IL-2 spontaneously forms dimers with both carbohydrate recognition and cell proliferation activity.
  • Substitution of Asn-26 with Gln or Asp maintained dimerization but altered carbohydrate recognition and cell proliferation.
  • These findings implicate Asn-26 in the carbohydrate recognition site of IL-2.

Conclusions:

  • IL-2 dimerization is essential for its carbohydrate-binding and cell proliferation functions.
  • The Asn-26 residue plays a key role in the carbohydrate recognition site of IL-2.
  • Carbohydrate recognition by IL-2 dimers triggers high-affinity receptor complex formation, enhancing T-cell proliferation.

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