Abstract
G-protein-coupled receptors (GPCRs) can initiate unique functional responses depending on the subcellular site of activation. Efforts to uncover the mechanistic basis of compartmentalized GPCR signaling have concentrated on the biochemical aspect of this regulation. Here we assess the biophysical positioning of receptor-containing endosomes as an alternative salient mechanism. We devise a strategy to rapidly and selectively redistribute receptor-containing endosomes ‘on command’ in intact cells without perturbing their biochemical composition. Next, we present two complementary optical readouts that enable robust measurements of bulk- and gene-specific GPCR/cyclic AMP (cAMP)-dependent transcriptional signaling with single-cell resolution. With these, we establish that disruption of native endosome positioning inhibits the initiation of the endosome-dependent transcriptional responses. Finally, we demonstrate a prominent mechanistic role of PDE-mediated cAMP hydrolysis and local protein kinase A activity in this process. Our study, therefore, illuminates a new mechanism regulating GPCR function by identifying endosome positioning as the principal mediator of spatially selective receptor signaling.
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Data availability
All relevant data supporting the findings are available within the paper and the Supplementary Data. Source data are provided with the manuscript. Additional information and reagents are available from the corresponding author upon reasonable request. Source data are provided with this paper.
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Acknowledgements
We thank members of the Tsvetanova Lab and R. Irannejad (UCSF) for valuable discussions of the project and feedback on the manuscript. Immunofluorescence microscopy imaging was performed using resources from the Duke Light Microscopy Core Facility, with specific training under L. Cameron, Y. Gao and B. Carlson. PKARegIIB-mCherry and EGFP-SNX27 were gifts from R. Irannejad (UCSF). SSF-β2-AR, RAB11a-GFP, DynK44E-mCherry, pcDNA3.0, eGFP-C1 and Endo-bPAC were gifts from M. von Zastrow (UCSF). MK1200 and dCas9-BFP-KRAB were gifts from M. Kampmann (UCSF). pBa.Kif1a 1-396.GFP was a gift from G. Banker and M. Bentley (Addgene plasmid, 45058; http://n2t.net/addgene:45058; RRID:Addgene_45058). pBa-KIF5C 559-tdTomato-FKBP was a gift from G. Banker and M. Bentley (Addgene plasmid, 64211; http://n2t.net/addgene:64211; RRID:Addgene_64211). pEGFP-FRB was a gift from K. Hahn (Addgene plasmid, 25919; http://n2t.net/addgene:25919; RRID:Addgene_25919). GFP-EEA1 wt was a gift from S. Corvera (Addgene plasmid, 42307; http://n2t.net/addgene:42307; RRID:Addgene_42307). pmCherry-N1-GalT was a gift from L. Lu (Addgene plasmid, 87327; http://n2t.net/addgene:87327; RRID:Addgene_87327). Flamindo2 and nlsFlamindo2 were gifts from T. Kitaguchi (Addgene plasmid, 73938; http://n2t.net/addgene:73938; RRID:Addgene_73938 and Addgene plasmid, 73939; http://n2t.net/addgene:73939; RRID:Addgene_73939). Figures 1a and 6f were created using BioRender. Research reported in this publication was supported by the National Institutes of Health (R01NS127847 and R35GM142640 to N.G.T., R01DK073368 to J.Z. and F31NS120567 to B.K.A.W.) and the American Heart Association (Predoctoral Fellowship 834472 to J.F.Z.).
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N.G.T. supervised the project. N.G.T. and B.K.A.W. conceived the project and designed experiments. B.K.A.W. and J.F.Z. performed and analyzed all experiments. J.Z. supervised and coordinated experiments involving the generation and characterization of nuclear ExRai-AKAR2 sensor. N.G.T., B.K.A.W. and J.F.Z. interpreted results. N.G.T. and B.K.A.W. wrote the manuscript. All authors edited the manuscript.
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Nature Chemical Biology thanks Davide Calebiro and the other, anonymous, reviewers for their contribution to the peer review of this work.
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Supplementary Figs. 1–14 and uncropped western blot for Supplementary Fig. 8c.
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Supplementary Video 1
Live-cell imaging of HEK293 cells expressing CID components. The video shows endosome distribution after 5 min of AP21967 (rapalog) treatment.
Supplementary Video 2
Live-cell imaging of HEK293 cells expressing Flamindo2-FRB-EEA1 and Kif1a-tdTomato-FKBP. Cells were pretreated with AP21967 (rapalog) for 30 min.
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Willette, B.K.A., Zhang, JF., Zhang, J. et al. Endosome positioning coordinates spatially selective GPCR signaling. Nat Chem Biol 20, 151–161 (2024). https://doi.org/10.1038/s41589-023-01390-7
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DOI: https://doi.org/10.1038/s41589-023-01390-7