000097024 001__ 97024
000097024 005__ 20210902121848.0
000097024 0247_ $$2doi$$a10.1038/s41586-020-2419-1
000097024 0248_ $$2sideral$$a118974
000097024 037__ $$aART-2020-118974
000097024 041__ $$aeng
000097024 100__ $$aLee, Y.
000097024 245__ $$aMolecular Basis of ß-arrestin Coupling to Formoterol-Bound ß1-adrenoceptor
000097024 260__ $$c2020
000097024 5060_ $$aAccess copy available to the general public$$fUnrestricted
000097024 5203_ $$aThe β1-adrenoceptor (β1AR) is a G-protein-coupled receptor (GPCR) that couples1 to the heterotrimeric G protein Gs. G-protein-mediated signalling is terminated by phosphorylation of the C terminus of the receptor by GPCR kinases (GRKs) and by coupling of β-arrestin 1 (βarr1, also known as arrestin 2), which displaces Gs and induces signalling through the MAP kinase pathway2. The ability of synthetic agonists to induce signalling preferentially through either G proteins or arrestins-known as biased agonism3-is important in drug development, because the therapeutic effect may arise from only one signalling cascade, whereas the other pathway may mediate undesirable side effects4. To understand the molecular basis for arrestin coupling, here we determined the cryo-electron microscopy structure of the β1AR-βarr1 complex in lipid nanodiscs bound to the biased agonist formoterol5, and the crystal structure of formoterol-bound β1AR coupled to the G-protein-mimetic nanobody6 Nb80. βarr1 couples to β1AR in a manner distinct to that7 of Gs coupling to β2AR-the finger loop of βarr1 occupies a narrower cleft on the intracellular surface, and is closer to transmembrane helix H7 of the receptor when compared with the C-terminal α5 helix of Gs. The conformation of the finger loop in βarr1 is different from that adopted by the finger loop of visual arrestin when it couples to rhodopsin8. β1AR coupled to βarr1 shows considerable differences in structure compared with β1AR coupled to Nb80, including an inward movement of extracellular loop 3 and the cytoplasmic ends of H5 and H6. We observe weakened interactions between formoterol and two serine residues in H5 at the orthosteric binding site of β1AR, and find that formoterol has a lower affinity for the β1AR-βarr1 complex than for the β1AR-Gs complex. The structural differences between these complexes of β1AR provide a foundation for the design of small molecules that could bias signalling in the β-adrenoceptors.
000097024 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000097024 590__ $$a49.962$$b2020
000097024 591__ $$aMULTIDISCIPLINARY SCIENCES$$b1 / 73 = 0.014$$c2020$$dQ1$$eT1
000097024 592__ $$a15.993$$b2020
000097024 593__ $$aMultidisciplinary$$c2020$$dQ1
000097024 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000097024 700__ $$aWarne, T.
000097024 700__ $$aNehmé, R.
000097024 700__ $$aPandey, S.
000097024 700__ $$aDwivedi-Agnihotri, H.
000097024 700__ $$aChaturvedi, M.
000097024 700__ $$aEdwards, PC.
000097024 700__ $$0(orcid)0000-0002-4254-3148$$aGarcía-Nafría, J.$$uUniversidad de Zaragoza
000097024 700__ $$aLeslie, AGW.
000097024 700__ $$aShukla, AK.
000097024 700__ $$aTate, CG.
000097024 7102_ $$11002$$2060$$aUniversidad de Zaragoza$$bDpto. Bioq.Biolog.Mol. Celular$$cÁrea Bioquímica y Biolog.Mole.
000097024 773__ $$g583, 7818 (2020), 862 - 866$$pNature$$tNature$$x0028-0836
000097024 8564_ $$s5252962$$uhttps://zaguan.unizar.es/record/97024/files/texto_completo.pdf$$yPostprint
000097024 8564_ $$s467000$$uhttps://zaguan.unizar.es/record/97024/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000097024 909CO $$ooai:zaguan.unizar.es:97024$$particulos$$pdriver
000097024 951__ $$a2021-09-02-10:28:24
000097024 980__ $$aARTICLE