--- _id: '3150' abstract: - lang: eng text: Tripartite G-protein-coupled receptors (GPCRs) represent one of the largest groups of signal transducers, transmitting signals from hormones, neuropeptides, odorants, food and light. Ligand-bound receptors catalyse GDP/GTP exchange on the G-protein α-subunit (Gα), leading to α-GTP separation from the βγ subunits and pathway activation. Activating mutations in the receptors or G proteins underlie many human diseases, including some cancers, dwarfism and premature puberty. Regulators of G-protein signalling (RGS proteins) are known to modulate the level and duration of ligand-induced signalling by accelerating the intrinsic GTPase activity of the Gα subunit, and thus reformation of the inactive GDP-bound Gα. Here we find that even in the absence of receptor, mutation of the RGS family member Sst2 (refs 6-9) permits spontaneous activation of the G-protein-coupled mating pathway in Saccharomyces cerevisiae at levels normally seen only in the presence of ligand. Our work demonstrates the occurence of spontaneous tripartite G-protein signalling in vivo and identifies a requirement for RGS proteins in preventing such receptor-independent activation. author: - first_name: Daria E full_name: Daria Siekhaus id: 3D224B9E-F248-11E8-B48F-1D18A9856A87 last_name: Siekhaus orcid: 0000-0001-8323-8353 - first_name: David full_name: Drubin, David G last_name: Drubin citation: ama: Siekhaus DE, Drubin D. Spontaneous receptor-independent heterotrimeric G-protein signalling in an RGS mutant. Nature Cell Biology. 2003;5(3):231-235. doi:10.1038/ncb941 apa: Siekhaus, D. E., & Drubin, D. (2003). Spontaneous receptor-independent heterotrimeric G-protein signalling in an RGS mutant. Nature Cell Biology. Nature Publishing Group. https://doi.org/10.1038/ncb941 chicago: Siekhaus, Daria E, and David Drubin. “Spontaneous Receptor-Independent Heterotrimeric G-Protein Signalling in an RGS Mutant.” Nature Cell Biology. Nature Publishing Group, 2003. https://doi.org/10.1038/ncb941. ieee: D. E. Siekhaus and D. Drubin, “Spontaneous receptor-independent heterotrimeric G-protein signalling in an RGS mutant,” Nature Cell Biology, vol. 5, no. 3. Nature Publishing Group, pp. 231–235, 2003. ista: Siekhaus DE, Drubin D. 2003. Spontaneous receptor-independent heterotrimeric G-protein signalling in an RGS mutant. Nature Cell Biology. 5(3), 231–235. mla: Siekhaus, Daria E., and David Drubin. “Spontaneous Receptor-Independent Heterotrimeric G-Protein Signalling in an RGS Mutant.” Nature Cell Biology, vol. 5, no. 3, Nature Publishing Group, 2003, pp. 231–35, doi:10.1038/ncb941. short: D.E. Siekhaus, D. Drubin, Nature Cell Biology 5 (2003) 231–235. date_created: 2018-12-11T12:01:41Z date_published: 2003-03-01T00:00:00Z date_updated: 2021-01-12T07:41:24Z day: '01' doi: 10.1038/ncb941 extern: 1 intvolume: ' 5' issue: '3' month: '03' page: 231 - 235 publication: Nature Cell Biology publication_status: published publisher: Nature Publishing Group publist_id: '3544' quality_controlled: 0 status: public title: Spontaneous receptor-independent heterotrimeric G-protein signalling in an RGS mutant type: journal_article volume: 5 year: '2003' ...