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. 1992 Jun;11(6):2047–2053. doi: 10.1002/j.1460-2075.1992.tb05262.x

Identification of three adjacent amino acids of interleukin-2 receptor beta chain which control the affinity and the specificity of the interaction with interleukin-2.

J L Imler 1, A Miyajima 1, G Zurawski 1
PMCID: PMC556670  PMID: 1600937

Abstract

The beta chain of the interleukin-2 (IL-2) receptor (IL-2R beta) and the interleukin-3 (IL-3) binding protein AIC2A are members of the family of cytokine receptors, which also includes the receptors for growth hormone (GHR) and prolactin. A four amino acid sequence of AIC2A has recently been shown to be critical for IL-3 binding. We analyze here the function of the analogous sequence of human IL-2R beta and identify three amino acids, Ser132, His133 and Tyr134, which play a critical role in IL-2 binding. We show that some mutant IL-2 proteins with substitutions of a critical Asp residue in the N-terminal alpha-helix bind the mutant IL-2R beta receptor with a higher affinity than the wild-type receptor. This suggests that the critical Asp34 in the ligand and the sequence Ser-His-Tyr (positions 132-134) in the receptor interact directly. On the double barrel beta-stranded structural model of cytokine receptors, the residues important for ligand binding in IL-2R beta, AIC2A and GHR map to strikingly similar locations within a barrel, with the interesting difference that it is the N-terminal barrel for GHR and the C-terminal barrel for IL-2R beta and AIC2A.

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Selected References

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