Abstract
The GLP-1 receptor, one of the most successful drug targets for the treatment of type 2 diabetes and obesity, is known to engage multiple intracellular signaling proteins. However, it remains less explored how the receptor interacts with proteins on the cell membrane. Here, we present a ligand-based proximity labeling approach to interrogate the native cell membrane interactome for the GLP-1 receptor after agonist simulation. Our study identified several unreported putative cell membrane interactors for the endogenous receptor in either a pancreatic β cell line or a neuronal cell line. We further uncovered new regulators of GLP-1 receptor-mediated signaling and insulinotropic responses in β cells. Additionally, we obtained a time-resolved cell membrane interactome map for the receptor in β cells. Therefore, our study provides a new approach that is generalizable to map endogenous cell membrane interactomes for G-protein-coupled receptors to decipher the molecular basis of their cell-type-specific functional regulation.
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Data availability
The raw LC–MS/MS data generated in this study have been deposited to the ProteomeXchange Consortium55 via the iProX partner repository56 with the dataset identifier IPX0007296000 or PXD046204. Protein identification and quantification results related to Figs. 4 and 6 are provided in Supplementary Tables 1–4. Source data are provided with this paper.
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Acknowledgements
We are grateful to Q. Wang from ShanghaiTech University for the generous gifts of His-SUMO and ULP1 plasmids and Y. Liu for help with the insulin secretion assay. We also thank T. Mao from Structure Therapeutics, X. Liu, C. Tian and other staff members of the Assay, Mammalian, Cloning, and Imaging Core Facilities of iHuman Institute for their great help or technical support. This work was funded by the National Key R&D Program of China (2022YFA1302902 to W.S.; 2021YFA0804700 to M.Z.), National Natural Science Foundation of China (32171439 to W.S.; 32301250 to B.Z.), ShanghaiTech University, Shanghai Frontiers Science Center for Biomacromolecules and Precision Medicine at ShanghaiTech University (to W.S. and M.Z.) and the Innovative Research Team of High-Level Local Universities in Shanghai (to M.Z.).
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W.S. and M.Z. conceived and supervised the project. T.D. developed the method and performed proximity labeling, proteomic analysis and functional assays in INS-1E cells. J.Y. performed proximity labeling and proteomic analyses in SK-N-SH cells. Z.C. prepared the labeling probes and assisted in labeling experiments. B.Z., S.L., Y.X., L.Y. and R.L. assisted in functional assays, proteomic experiments or data processing. W.S. and T.D. wrote the manuscript with input from all other authors.
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Supplementary Figs. 1–9 and Note.
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Supplementary Data 1
Unprocessed western blots for Supplementary Figs. 1, 3 and 7.
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Statistical source data for Supplementary Figs. 1, 4, 7 and 8.
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Source Data Fig. 5
Statistical source data.
Source Data Fig. 5
Unprocessed western blots.
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Dang, T., Yu, J., Cao, Z. et al. Endogenous cell membrane interactome mapping for the GLP-1 receptor in different cell types. Nat Chem Biol (2024). https://doi.org/10.1038/s41589-024-01714-1
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DOI: https://doi.org/10.1038/s41589-024-01714-1