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These receptors transduce signals through heterotrimeric Gi proteins. Here, we elucidated cryo-EM structures that depict \u03b1\n                    <jats:sub>2A<\/jats:sub>\n                    -AR in complex with Gi proteins, along with the endogenous agonist epinephrine or the synthetic agonist dexmedetomidine. Molecular dynamics simulations and functional studies reinforce the results of the structural revelations. Our investigation revealed that epinephrine exhibits different conformations when engaging with \u03b1-ARs and \u03b2-ARs. Furthermore, \u03b1\n                    <jats:sub>2A<\/jats:sub>\n                    -AR and \u03b2\n                    <jats:sub>1<\/jats:sub>\n                    -AR (primarily coupled to Gs, with secondary associations to Gi) were compared and found to exhibit different interactions with Gi proteins. Notably, the stability of the epinephrine\u2013\u03b1\n                    <jats:sub>2A<\/jats:sub>\n                    -AR\u2013Gi complex is greater than that of the dexmedetomidine\u2013\u03b1\n                    <jats:sub>2A<\/jats:sub>\n                    -AR\u2013Gi complex. These findings substantiate and improve our knowledge on the intricate signaling mechanisms orchestrated by ARs and concurrently shed light on the regulation of \u03b1-ARs and \u03b2-ARs by epinephrine.\n                  <\/jats:p>","DOI":"10.1038\/s12276-024-01296-x","type":"journal-article","created":{"date-parts":[[2024,9,1]],"date-time":"2024-09-01T21:02:04Z","timestamp":1725224524000},"page":"1952-1966","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Distinct binding conformations of epinephrine with \u03b1- and \u03b2-adrenergic receptors"],"prefix":"10.1038","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1109-2161","authenticated-orcid":false,"given":"Jian-Shu","family":"Lou","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minfei","family":"Su","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hung Nguyen","family":"Do","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yinglong","family":"Miao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2534-2587","authenticated-orcid":false,"given":"Xin-Yun","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,9,2]]},"reference":[{"key":"1296_CR1","doi-asserted-by":"publisher","first-page":"202","DOI":"10.1126\/science.173.3993.202","volume":"173","author":"US von Euler","year":"1971","unstructured":"von Euler, U. 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