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• W1437694810 abstract "Research Article1 September 1992free access Conversion of human interleukin-4 into a high affinity antagonist by a single amino acid replacement. N. Kruse N. Kruse Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. Search for more papers by this author H.P. Tony H.P. Tony Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. Search for more papers by this author W. Sebald W. Sebald Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. Search for more papers by this author N. Kruse N. Kruse Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. Search for more papers by this author H.P. Tony H.P. Tony Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. Search for more papers by this author W. Sebald W. Sebald Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. Search for more papers by this author Author Information N. Kruse1, H.P. Tony1 and W. Sebald1 1Theodor-Boveri-Institut für Biowissenschaften (Biozentrum) Universität Würzburg, Germany. The EMBO Journal (1992)11:3237-3244https://doi.org/10.1002/j.1460-2075.1992.tb05401.x PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info Interleukin-4 (IL-4) represents a prototypic lymphokine (for a recent review see Paul, 1991). It promotes differentiation of B-cells and the proliferation of T- and B-cell, and other cell types of the lymphoid system. An antagonist of human IL-4 was discovered during the studies presented here after Tyr124 of the recombinant protein had been substituted by an aspartic acid residue. This IL-4 variant, Y124D, bound with high affinity to the IL-4 receptor (KD = 310 pM), but retained no detectable proliferative activity for T-cells and inhibited IL-4-dependent T-cell proliferation competitively (K(i) = 620 pM). The loss of efficacy in variant Y124D was estimated to be greater than 100-fold on the basis of a weak partial agonist activity for the very sensitive induction of CD23 positive B-cells. The substitution of Tyr124 by either phenylalanine, histidine, asparagine, lysine or glycine resulted in partial agonist variants with unaltered receptor binding affinity and relatively small deficiencies in efficacy. These results demonstrate that high affinity binding and signal generation can be uncoupled efficiently in a ligand of a receptor belonging to the recently identified hematopoietin receptor family. In addition we show for the first time, that a powerful antagonist acting on the IL-4 receptor system can be derived from the IL-4 protein. Previous ArticleNext Article Volume 11Issue 91 September 1992In this issue RelatedDetailsLoading ..." @default.
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• W1437694810 title "Conversion of human interleukin-4 into a high affinity antagonist by a single amino acid replacement." @default.
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• W1437694810 doi "https://doi.org/10.1002/j.1460-2075.1992.tb05401.x" @default.
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