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• W2053912544 abstract "The monomeric model of rhodopsin-like G protein-coupled receptors (GPCRs) has progressively yielded the floor to the concept of GPCRs being oligo(di)mers, but the functional correlates of dimerization remain unclear. In this report, dimers of glycoprotein hormone receptors were demonstrated in living cells, with a combination of biophysical (bioluminescence resonance energy transfer and homogenous time resolved fluorescence/fluorescence resonance energy transfer), functional and biochemical approaches. Thyrotropin (TSHr) and lutropin (LH/CGr) receptors form homo- and heterodimers, via interactions involving primarily their heptahelical domains. The large hormone-binding ectodomains were dispensable for dimerization but modulated protomer interaction. Dimerization was not affected by agonist binding. Observed functional complementation indicates that TSHr dimers may function as a single functional unit. Finally, heterologous binding-competition studies, performed with heterodimers between TSHr and LH/CG-TSHr chimeras, demonstrated the unsuspected existence of strong negative cooperativity of hormone binding. Tracer desorption experiments indicated an allosteric behavior in TSHr and, to a lesser extent, in LH/CGr and FSHr homodimers. This study is the first report of homodimerization associated with negative cooperativity in rhodopsin-like GPCRs. As such, it may warrant revisitation of allosterism in the whole GPCR family." @default.
• W2053912544 created "2016-06-24" @default.
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• W2053912544 date "2005-05-12" @default.
• W2053912544 modified "2023-10-18" @default.
• W2053912544 title "Glycoprotein hormone receptors: link between receptor homodimerization and negative cooperativity" @default.
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• W2053912544 doi "https://doi.org/10.1038/sj.emboj.7600686" @default.
• W2053912544 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1142614" @default.
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