PMID: 8943050Nov 26, 1996Paper

A functional interleukin 12 receptor complex is composed of two beta-type cytokine receptor subunits

Proceedings of the National Academy of Sciences of the United States of America
D H PreskyU Gubler

Abstract

We have identified a cDNA from a human phytohemagglutinin-activated lymphoblast library encoding a protein that binds 125I-labeled human interleukin 12 (125I-huIL-12) with a Kd of about 5 nM when expressed in COS-7 cells. When coexpressed in COS-7 cells with the previously identified IL-12 beta receptor (IL-12R beta) protein, two classes of 125I-huIL-12 binding sites were measured with Kds of about 55 pM and 8 nM, corresponding to the high- and low-affinity binding sites seen on phytohemagglutinin-activated lymphoblasts. This newly identified huIL-12R subunit is a member of the cytokine receptor superfamily, with closest resemblance to the beta-type cytokine receptor gp130 and the receptors for leukemia inhibitory factor and granulocyte colony-stimulating factor. Consequently, we have reclassified the previously identified IL-12R beta subunit as huIL-12R beta 1 and designated the newly identified subunit as huIL-12R beta 2. huIL-12R beta 2 is an 862-amino acid type I transmembrane protein with a 595-amino-acid-long extracellular domain and a cytoplasmic tail of 216 amino acids that contains three tyrosine residues. A cDNA encoding the mouse homolog of the huIL12R beta 2 protein has also been isolated. Human and mouse IL-12R bet...Continue Reading

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Citations

Mar 4, 1998·European Journal of Immunology·F GalbiatiL Adorini
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