Cell. 1991 Sep 20;66(6):1165-74.

Expression cloning of the human IL-3 receptor cDNA reveals a shared beta subunit for the human IL-3 and GM-CSF receptors.

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Department of Molecular Biology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, California 94304.

Abstract

A cDNA for a human interleukin-3 (hIL-3) binding protein has been isolated by a novel expression cloning strategy: a cDNA library was coexpressed with the cDNA for the beta subunit of human granulocyte/macrophage colony-stimulating factor (GM-CSF) receptor (hGMR beta) in COS7 cells and screened by binding of 125I-labeled IL-3. The cloned cDNA (DUK-1) encodes a mature protein of 70 kd, which belongs to the cytokine receptor family and which alone binds hIL-3 with extremely low affinity (Kd = 120 +/- 60 nM). A high affinity IL-3-binding site (Kd = 140 +/- 30 pM) was reconstituted by coexpressing the DUK-1 protein and hGMR beta, indicating that hIL-3R and hGMR share the beta subunit. Therefore, we designated DUK-1 as the alpha subunit of the hIL-3R. As in human hematopoietic cells, hIL-3 and hGM-CSF complete for binding in fibroblasts expressing the cDNAs for hIL-3R alpha, GMR alpha, and the common beta subunit, indicating that different alpha subunits compete for a common beta subunit.

PMID:: 1833064; [PubMed - indexed for MEDLINE]

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Expression cloning of the human IL-3 receptor cDNA reveals a shared beta subunit...
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Cell. 1991 Sep 20 ;66(6):1165-74.

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