Download MendeleyApo-state structure of the metabotropic glutamate receptor 5 transmembrane domain obtained using a photoswitchable ligand.
Kondo, Y., Hatton, C., Cheng, R., Trabuco, M., Glover, H., Bertrand, Q., Stierli, F., Seidel, H.P., Mason, T., Sarma, S., Tellkamp, F., Kepa, M., Dworkowski, F., Mehrabi, P., Hennig, M., Standfuss, J.(2025) Protein Sci 34: e70104-e70104
- PubMed: 40521617
- DOI: https://doi.org/10.1002/pro.70104
- Primary Citation of Related Structures:
9HC0, 9HC3 - PubMed Abstract:
Metabotropic glutamate receptor 5 (mGlu5) is implicated in various neurodegenerative disorders, making it an attractive drug target. Although several ligand-bound crystal structures of mGlu5 exist, their apo-state crystal structure remains unknown. Here, we study mGlu5 structural changes using the photochemical affinity switch, alloswitch-1, in combination with time-resolved freeze-trapping methods. By X-ray crystallography, we demonstrated that isomerizing alloswitch-1 leads to its release from the binding pocket within a few seconds. The apo structure, determined at a resolution of 2.9 Å, is more comparable to the inactive state than to the active state. Our approach presents an accessible alternative to time-resolved serial crystallography for capturing thermodynamically stable transient intermediates. The mGlu5 apo-structure provides molecular insights into the ligand-free allosteric pocket, which can guide the design of new allosteric modulators.
- PSI Center for Life Sciences, Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen PSI, Switzerland.
Organizational Affiliation:
