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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

David Reiner-Link , Alessandro Berghella , Brinda K Rana , G Enrico Rovati , Valerie Capra , Caroline M Person , Abigail Alwin , Campbell Krusemark , Ezequiel Marron Fernandez de Velasco , Steven H Olson , Lauren M Slosky , et. al. GPCR community members Join the GPCR fan club and geek out with fellows! So much more to come!

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.

., Vieira-Rocha, M. S., Vojtek, M., Sousa, J. B., & Diniz, C. (2021). E., Healy, M. D., & Collins, B. M. (2019). M., & Lefkowitz, R. J. (2003). B., Conti, M., & von Zastrow, M. (2017). M., & Murray, F. (2018).

., Bolanowski, M. A., Bennett, C. D., Rands, E., Diehl, R. E., Mumford, R. A., Slater, E. S., Caron, M. G., Lefkowitz, R. J., & Strader, C. D. (1986). Nature, 321(6065), 75–79. https://doi.org/10.1038/321075a0 Fredriksson, R., Lagerström, M. M., Pérez-Hernández, G., Batebi, H., Gao, Y., Eskici, G., Seven, A. ., Casiraghi, M., He, F., Maul, L., Gmeiner, P., Kobilka, B. K., Hildebrand, P.

M., Medel-Lacruz, B., Baidya, M., Makarova, M., Mistry, R., Goulding, J., Drube, J., Hoffmann, C., Owen M., Shukla, A. K., Selent, J., Hill, S. J., & Calebiro, D. (2023). M., Kawakami, K., Masureel, M., Maeda, S., Garcia, K. C., von Zastrow, M., Inoue, A., & Kobilka, B. I., & von Zastrow, M. (2001).

a GPCR Paper with his team: Targeted Drug Design through GPCR Mutagenesis: Insights from β2AR China M Payne ,   Cam Sinh Lu ,   Karen Gregory ,  Lauren May ,  Andrea Vernall , et al. for their fantastic

A recent breakthrough study published in Nature by Makaía M. Papasergi-Scott, M. M. et al. Time-resolved cryo-EM of G-protein activation by a GPCR.

M. (2011). Deep mutational scanning: assessing protein function on a massive scale. M., Stephany, J. J., & Fields, S. (2014). Nature Protocols , 9 (9), 2267–2284. https://doi.org/10.1038/nprot.2014.153 Howard, M. M., Trinidad, D. D., English, J. G., Coyote-Maestas, W., & Aashish Manglik. (2024).

., Radwanska, M., & Magez, S. (2023). M., Thian, F. S., Kobilka, T. S., Schnapp, A., Konetzki, I., Sunahara, R. K., Gellman, S. M., Manglik, A., Hu, J., Hu, K., Eitel, K., Hübner, H., Pardon, E., Valant, C., Sexton, P. M., Christopoulos, A., Felder, C. C., Gmeiner, P., Steyaert, J., Weis, W. I., Garcia, K. M., Dukkipati, A., Feinberg, E. N., Angelini, A., Waghray, D., Dror, R. O., Ploegh, H.

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. 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).

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.

H. 2020, Casiraghi, M. et al. 2019), double electron-electron resonance (DEER) spectroscopy for high-resolution M. et al. 2019), and hydrogen-deuterium exchange (HDX) mass spectrometry for time-dependent conformational M. et al. 1999), while dual knockout is lethal (Schmid, C. L., & Bohn, L. M. 2009).

Stuart Maudsley, Nicole Perry-Hauser, Lauren Slosky, Cesare Orlandi, and Simone Prömel.

Extracellular signal-regulated kinases – a potential pathway for GPCR-targeted drug discovery Nicola J Smith, Lauren

Lauren Slosky, Dr. Christel Menet, Dr. Ben Myers and Dr. Niña Caculitan.

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

M, et al. 2023).

., Ghassemian, M., Kufareva, I., & Ghosh, P. (2024).

Bouvier, M., Oligomerization of G-protein-coupled transmitter receptors.  

SMOOTHENED-PKA signaling in the Hedgehog cascade Elita Yuliantie , Arthur Christopoulos , Patrick M.

M., & Lefkowitz, R. J. (2003).

Continuing Study Addex Therapeutics in the 23rd BioEquity Europe Conference Simon Bekker-Jensen and Mette M

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

Devki D Sukhtankar and Pina M Cardarelli's research: Burixafor Hydrobromide (GPC-100) effects on hematopoietic

K ´ onigstorfer, M. Mozhayeva, Y. Sara, T.C. Südhof, and ¨ E.T. Kavalali. 2001.