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Title | Large library docking identifies positive allosteric modulators of the calcium-sensing receptor. |
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Journal, issue, pages | Science, Vol. 385, Issue 6715, Page eado1868, Year 2024 |
Publish date | Sep 20, 2024 |
Authors | Fangyu Liu / Cheng-Guo Wu / Chia-Ling Tu / Isabella Glenn / Justin Meyerowitz / Anat Levit Kaplan / Jiankun Lyu / Zhiqiang Cheng / Olga O Tarkhanova / Yurii S Moroz / John J Irwin / Wenhan Chang / Brian K Shoichet / Georgios Skiniotis / |
PubMed Abstract | Positive allosteric modulator (PAM) drugs enhance the activation of the calcium-sensing receptor (CaSR) and suppress parathyroid hormone (PTH) secretion. Unfortunately, these hyperparathyroidism- ...Positive allosteric modulator (PAM) drugs enhance the activation of the calcium-sensing receptor (CaSR) and suppress parathyroid hormone (PTH) secretion. Unfortunately, these hyperparathyroidism-treating drugs can induce hypocalcemia and arrhythmias. Seeking improved modulators, we docked libraries of 2.7 million and 1.2 billion molecules against the CaSR structure. The billion-molecule docking found PAMs with a 2.7-fold higher hit rate than the million-molecule library, with hits up to 37-fold more potent. Structure-based optimization led to nanomolar leads. In ex vivo organ assays, one of these PAMs was 100-fold more potent than the standard of care, cinacalcet, and reduced serum PTH levels in mice without the hypocalcemia typical of CaSR drugs. As determined from cryo-electron microscopy structures, the PAMs identified here promote CaSR conformations that more closely resemble the activated state than those induced by the established drugs. |
External links | Science / PubMed:39298584 |
Methods | EM (single particle) |
Resolution | 2.6 - 3.5 Å |
Structure data | EMDB-45127, PDB-9c1p: EMDB-45156, PDB-9c2f: EMDB-45792: Constituent EM map: focused refinement of the Venus flytrap (VFT) and cysteine-rich (CRD) domains of the calcium-sensing receptor. EMDB-45795: Focused refinement of the Heptahelical transmembrane (7TM) domain of the calcium-sensing receptor EMDB-45804: Raw Consensus map of the Calcium-Sensing Receptor in complex with positive allosteric modulator '6218 EMDB-45882: Raw Consensus map of the Calcium-Sensing Receptor in complex with positive allosteric modulator '54149 EMDB-45901: Focused refinement of the Heptahelical transmembrane (7TM) domain of the calcium-sensing receptor bound to positive modulator '54149 EMDB-45902: Focused refinement of the Venus flytrap domain of the calcium-sensing receptor bound to positive modulator '54149 |
Chemicals | ChemComp-NAG: ChemComp-CA: ChemComp-TRP: ChemComp-PO4: PDB-1atp: PDB-1atx: |
Source |
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Keywords | MEMBRANE PROTEIN / G-protein coupled receptor / calcium-sensing |