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A recent breakthrough study published in Nature by Makaía M. Papasergi-Scott and colleagues has made significant progress in this area 2. Papasergi-Scott, M. M. et al. Time-resolved cryo-EM of G-protein activation by a GPCR.

This week's highlight includes congrats to: Makaía M Papasergi-Scott, Peter Gmeiner, Brian K Kobilka,

G protein-coupled receptors (GPCRs) transmit extracellular signals to the inside by activation of intracellular effector proteins. Different agonists can promote differential receptor-induced signaling responses - termed bias - potentially by eliciting different levels of recruitment of effector proteins. As activation and recruitment of effector proteins might influence each other, thorough analysis of bias is difficult. Here, we compared the efficacy of seven agonists to induce G protein, G protein-coupled receptor kinase 2 (GRK2), as well as arrestin3 binding to the muscarinic acetylcholine receptor M3 by utilizing FRET-based assays. In order to avoid interference between these interactions, we studied GRK2 binding in the presence of inhibitors of Gi and Gq proteins and analyzed arrestin3 binding to prestimulated M3 receptors to avoid differences in receptor phosphorylation influencing arrestin recruitment. We measured substantial differences in the agonist efficacies to induce M3R-arrestin3 versus M3R-GRK2 interaction. However, the rank order of the agonists for G protein- and GRK2-M3R interaction was the same, suggesting that G protein and GRK2 binding to M3R requires similar receptor conformations, whereas requirements for arrestin3 binding to M3R are distinct. Read full article

S., Caron, M. G., Lefkowitz, R. J., & Strader, C. D. (1986). Current opinion in structural biology, 55, 161–177. https://doi.org/10.1016/j.sbi.2019.04.007 Papasergi-Scott , M. M., Pérez-Hernández, G., Batebi, H., Gao, Y., Eskici, G., Seven, A. B., Panova, O., Hilger, D., Casiraghi, M., He, F., Maul, L., Gmeiner, P., Kobilka, B.

M.; Compton, D. R.; Martin, B. R.; Abood, M. E. , M. C.; Westphal, M. V.; Mostinski, Y.; Mach, L.; Wasinska-Kalwa, M.; Weise, M.; Hoare, B. .; Maccarrone, M.; Veprintsev, D. B.; Carreira, E. M.; Grether, U.; Nazaré, M. F.; Nicolotti, O.; Perrone, M. G.; Brea, J.; Loza, M. I.; Infantino, V.; Abate, C.; Contino, M.

M., & Fields, S. (2014). Deep mutational scanning: a new style of protein science. M., Marti-Solano, M., Sandhu, M., Kobilka, B. K., Bouvier, M., & Babu, M. M. (2023). Kosar, M., Sarott, R. C., Sykes, D. A., Viray, A. E., Vitale, R. M., Tomašević, N., ... & Carreira, E. M. (2024). M., Christopoulos, A., & May, L. T. (2016).

M., Marti-Solano, M., Sandhu, M., Kobilka, B. K., Bouvier, M., & Babu, M. M. (2023). Howard, M. K., Hoppe, N., Huang, X. P., Macdonald, C. B., Mehrota, E., Grimes, P.

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M. Aragay et al. 1998). Removal of G proteins by using CRISPR KO of Gαi (Gαi KO) or KO of all Gα subtypes (Gα_all KO) (M. constitutively internalize through clathrin-coated pits independently of phosphorylation and β-arrestin (M. M. Paing et al. 2022; J. L. Sapmaz et al. 2019, M. N. J. Seaman 2012).

The fission yeast Schizosaccharomyces pombe has two mating types, Plus (P) and Minus (M). investigated the stringency of the two GPCRs, Mam2 and Map3, for their respective pheromones, P-factor and M-factor acid residues of Map3, F214 and F215, are key residues important for discrimination of closely related M-factors

M. et al. 2018; Manglik, A. et al. 2012). the formation of dimers and alter their function by destroying the interface between two receptors (M. structure of CB1R–5HT2AR heterodimers, preventing cognitive impairment while preserving analgesia in vivo (M.

Dylan Scott Eiger, Chloe Hicks,  Dr. Nayara Braga Emidio, Ross Cheloha, Laura M Wingler, et al. for their work on Nanobody-Mediated Dualsteric

Source: Navarro G, Sotelo E, Raïch I, Loza MI, Brea J, Majellaro M. References Navarro G, Sotelo E, Raïch I, Loza MI, Brea J, Majellaro M.

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Franziska M Heydenreich, Michel Bouvier, Brian Kobilka, M Madan Babu, and their team's work on Molecular

David Reiner-Link , Alessandro Berghella , Brinda K Rana , G Enrico Rovati , Valerie Capra , Caroline M Abigail Alwin , Campbell Krusemark , Ezequiel Marron Fernandez de Velasco , Steven H Olson , Lauren M

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Miranda-Pastoriza D, Bernárdez R, Azuaje J, Prieto-Díaz R, Majellaro M, Tamhankar AV, Koenekoop L, González

(“Neurocrine Biosciences”) announced 22 November 2021, the applicable waiting period under the Hart-Scott-Rodino