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Mechanistic insights into G-protein coupling with an agonist-bound G-protein-coupled receptor
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Abstract
G-protein-coupled receptors (GPCRs) activate heterotrimeric G proteins by promoting guanine nucleotide exchange. Here, we investigate the coupling of G proteins with GPCRs and describe the events that ultimately lead to the ejection of GDP from its binding pocket in the Gα subunit, the rate-limiting step during G-protein activation. Using molecular dynamics simulations, we investigate the temporal progression of structural rearrangements of GDP-bound G s protein (G s·GDP; hereafter G sGDP) upon coupling to the β 2-adrenergic receptor (β 2 AR) in atomic detail. The binding of G sGDP to the β 2 AR is followed by long-range allosteric effects that significantly reduce the energy needed for GDP release: the opening of α1-αF helices, the displacement of the αG helix and the opening of the α-helical domain. Signal propagation to the G s occurs through an extended receptor interface, including a lysine-rich motif at the intracellular end of a kinked transmembrane helix 6, which was confirmed by site-directed mutagenesis and functional assays. From this β 2 AR-G sGDP intermediate, G s undergoes an in-plane rotation along the receptor axis to approach the β 2 AR-G sempty state. The simulations shed light on how the structural elements at the receptor-G-protein interface may interact to transmit the signal over 30 Å to the nucleotide-binding site. Our analysis extends the current limited view of nucleotide-free snapshots to include additional states and structural features responsible for signaling and G-protein coupling specificity.
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Flock, T., Hauser, A. S., Lund, N., Gloriam, D. E., Balaji, S., & Babu, M. M. (2017) · Nature · doi:10.1038/nature22070 · Cited by 384
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Metadata
- Authors
- Batebi, H., Pérez-Hernández, G., Rahman, S. N., Lan, B., Kamprad, A., Shi, M., Speck, D., Tiemann, J. K. S., Guixà-González, R., Reinhardt, F., Stadler, P. F., Papasergi-Scott, M. M., Skiniotis, G., Scheerer, P., Kobilka, B. K., Mathiesen, J. M., Liu, X., & Hildebrand, P. W.
- Affiliations
- Freie Universität Berlin (DE)
- University of Copenhagen (DK)
- Center for Life Sciences (CN)
- Humboldt-Universität zu Berlin (DE)
- Novozymes (Denmark) (DK)
- Leipzig University (DE)
- Stanford Medicine (US)
- Corresponding author
- Hildebrand, Peter W.
- ORCID
- Venue
- Nature Structural & Molecular Biology
- Published
- 2024-06-12
- Volume
- 31
- Issue
- 11
- Pages
- 1692-1701
- ISSN
- 1545-9985 (ISSN-L)
- 1545-9993
- PMC
- PMC12132790
- OpenAlex
- W4399586164
- Cited by
- 38
- References
- 3
- Citations by year
- 2026: 17 · 2025: 16 · 2024: 5
- FWCI
- 5.17
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Licence
- Locations
- Nature Structural & Molecular Biology (publishedVersion)
- Research Square (acceptedVersion, cc-by)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, other-oa)
- PubMed Central (acceptedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
- Funders
- Philipps-Universität Marburg
- Santa Fe Institute
- European Commission (HORIZON2020, 956314)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (440719683)
- Deutsche Forschungsgemeinschaft (390540038, EXC 2008/1390540038, subproject A01, EXC 2008/1, SFB1078, CRC 1423, subproject C01, 440719683, CRC 1078, 421152132, 221545957)
- National Natural Science Foundation of China (32122041)
- Universidad Nacional de Colombia
- Universität Wien
- Tsinghua University
- Stiftung Charité
- Berlin Institute of Health
- National Institutes of Health
- National Heart, Lung, and Blood Institute (K99HL161406)
- National Institute of Neurological Disorders and Stroke (R01NS028471, R35NS137408)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
- Keywords
- G protein coupling, G protein-coupled receptors, Gs protein, GDP release, guanine nucleotide exchange, beta2-adrenergic receptor, allosteric communication, nucleotide binding site, signal transduction
- MeSH terms
- Allosteric Regulation, Binding Sites, Guanosine Diphosphate, Humans, Protein Binding, Protein Conformation, Signal Transduction, Receptors, Adrenergic, beta-2, GTP-Binding Protein alpha Subunits, Gs, Molecular Dynamics Simulation
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