Stoichiometric structure-function analysis of the prolactin receptor signaling domain by receptor chimeras.

Molecular and Cellular Biology
W P ChangCharles V Clevenger

Abstract

The intracellular domain of the prolactin (PRL) receptor (PRLr) is required for PRL-induced signaling and proliferation. To identify and test the functional stoichiometry of those PRLr motifs required for transduction and growth, chimeras consisting of the extracellular domain of either the alpha or beta subunit of human granulocyte-macrophage colony-stimulating factor (GM-CSF) receptor (GM-CSFr) and the intracellular domain of the rat PRLr were synthesized. Because the high-affinity binding of GM-CSF results from the specific pairing of one alpha- and one beta-GM-CSFr, use of GM-CSFr/PRLr chimera enabled targeted dimerization of the PRLr intracellular domain. To that end, the extracellular domains of the alpha- and beta-GM-CSFr were conjugated to one of the following mutations: (i) PRLr C-terminal truncations, termed alpha278, alpha294, alpha300, alpha322, or beta322; (ii) PRLr tyrosine replacements, termed Y309F, Y382F, or Y309+382F; or, (iii) PRLr wild-type short, intermediate, or long isoforms. These chimeras were cotransfected into the cytokine-responsive Ba/F3 line, and their expression was confirmed by ligand binding and Northern and Western blot analyses. Data from these studies revealed that heterodimeric complexes of ...Continue Reading

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Citations

Dec 10, 1999·The Journal of Biological Chemistry·J B KlineC V Clevenger
Jul 15, 2006·Molecular Endocrinology·Samantha L Gadd, Charles V Clevenger
Jan 22, 2008·Journal of Mammary Gland Biology and Neoplasia·G SwaminathanS Y Fuchs
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