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Three Different MRNAs Encoding Human Granulocyte Colony-stimulating Factor Receptor

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Specialty Science
Date 1990 Nov 1
PMID 1701053
Citations 53
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Abstract

Three cDNAs for the human granulocyte colony-stimulating factor (G-CSF) receptor were isolated from the cDNA libraries of human U937 leukemia cells and placenta by using a murine G-CSF receptor cDNA as the probe. The human G-CSF receptor containing 813 amino acids had a marked homology (62.5%) with its murine counterpart and consisted of extracellular, transmembrane, and cytoplasmic domains. The WSXWS motif found in members of the newly identified growth factor receptor family was also present in the extracellular domain of the human G-CSF receptor. Expression of the cloned cDNA in monkey COS cells gave rise to a protein that could specifically bind G-CSF with a high affinity (Kd, 550 pM). Two other classes of the human G-CSF receptor were also identified, one of which had a deletion of the transmembrane domain and seemed to encode a secreted, soluble receptor. The third class of the G-CSF receptor contained a 27-amino acid insertion in the cytoplasmic domain and was highly expressed in placenta.

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