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G\u03b1 subunits cycle between an inactive GDP-bound state and an active GTP-bound state that engages downstream effectors. The duration of G\u03b1-mediated signaling is primarily governed by Regulators of G Protein Signaling (RGS) proteins, which accelerate GTP hydrolysis as GTPase-activating proteins (GAPs). To characterize these multi-specific G\u03b1 interactions at the individual residue level, we employed computational energy calculations across G\u03b1-partner complexes, focusing on residues critical for RGS interactions. This analysis showed that specific residues within the G\u03b1 \u201cswitch regions\u201d, conserved across the Gi and Gq subfamilies, play a central role in RGS recognition and GAP activity. Substantial energy contributions arise mainly from conserved residues within the switch I and II in the G\u03b1 GTPase domain. However, switch I interactions are dominated by electrostatic and non-polar contributions from the protein backbone, while switch II interactions are dominated by strong electrostatic side-chain contributions. Mutagenesis experiments confirmed that switch I side chains are not required for RGS GAP activity, but disrupting the tight switch I interface with RGSs abolished GAP activity. In contrast, alanine substitutions in individual switch II residues severely reduced RGS GAP activity, while switch III played only a minor role. Our findings offer residue-level insights into the conserved interactions underlying RGS\/effector regulation of G proteins and provide a basis for engineering G\u03b1 subunits with tailored interaction profiles, developing inhibitors of G\u03b1-RGS binding, or enabling rewiring of G protein-coupled signaling pathways in vivo.<\/jats:p>","DOI":"10.1042\/bcj20260287","type":"journal-article","created":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T14:38:29Z","timestamp":1786977509000},"page":"1785-1797","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Conserved structural elements in G\u03b1 subunit switch regions are necessary for efficient inactivation by RGS proteins"],"prefix":"10.1042","volume":"483","author":[{"given":"Isra","family":"Sadiya","sequence":"first","affiliation":[{"name":"Department of Human Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3103301, Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Fassler Bakhman","sequence":"additional","affiliation":[{"name":"Department of Human Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3103301, Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meirav","family":"Avital-Shacham","sequence":"additional","affiliation":[{"name":"Department of Human Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3103301, Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1807-4000","authenticated-orcid":false,"given":"Mickey","family":"Kosloff","sequence":"additional","affiliation":[{"name":"Department of Human Biology, Faculty of Natural Sciences, University of Haifa, Haifa, 3103301, Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"288","published-online":{"date-parts":[[2026,8,27]]},"reference":[{"key":"2026082704164822900_B1","doi-asserted-by":"publisher","first-page":"639","DOI":"10.1146\/annurev.biochem.66.1.639","article-title":"G protein mechanisms: insights from structural analysis","volume":"66","author":"Sprang","year":"1997","journal-title":"Annu. 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