Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/8683
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Type: Journal article
Title: Saturation mutagenesis of the β subunit of the human GM-CSF receptor shows clustering of constitutive mutations, activation of ERK MAP kinase and STAT pathways, and differential β subunit tyrosine phosphorylation
Other Titles: Saturation mutagenesis of the beta subunit of the human GM-CSF receptor shows clustering of constitutive mutations, activation of ERK MAP kinase and STAT pathways, and differential beta subunit tyrosine phosphorylation
Author: Jenkins, B.
Blake, T.
Gonda, T.
Citation: Blood, 1998; 92(6):1989-2002
Publisher: American Society of Hematology
Issue Date: 1998
ISSN: 0006-4971
1528-0020
Statement of
Responsibility: 
Jenkins, B J ; Blake, T J ; Gonda, T J
Abstract: <jats:p>The high-affinity receptors for human granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-3 (IL-3), and IL-5 are heterodimeric complexes consisting of cytokine-specific  subunits and a common signal-transducing β subunit (hβc). We have previously demonstrated the oncogenic potential of this group of receptors by identifying constitutively activating point mutations in the extracellular and transmembrane domains of hβc. We report here a comprehensive screen of the entire hβc molecule that has led to the identification of additional constitutive point mutations by virtue of their ability to confer factor independence on murine FDC-P1 cells. These mutations were clustered exclusively in a central region of hβc that encompasses the extracellular membrane-proximal domain, transmembrane domain, and membrane-proximal region of the cytoplasmic domain. Interestingly, most hβc mutants exhibited cell type-specific constitutive activity, with only two transmembrane domain mutants able to confer factor independence on both murine FDC-P1 and BAF-B03 cells. Examination of the biochemical properties of these mutants in FDC-P1 cells indicated that MAP kinase (ERK1/2), STAT, and JAK2 signaling molecules were constitutively activated. In contrast, only some of the mutant β subunits were constitutively tyrosine phosphorylated. Taken together, these results highlight key regions involved in hβc activation, dissociate hβc tyrosine phosphorylation from MAP kinase and STAT activation, and suggest the involvement of distinct mechanisms by which proliferative signals can be generated by hβc.</jats:p><jats:p>© 1998 by The American Society of Hematology.</jats:p>
Rights: © 1998 by The American Society of Hematology
DOI: 10.1182/blood.v92.6.1989.418k18_1989_2002
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