Movie
Controller
Structure viewers
About Yorodumi Papers
+Search query
-Structure paper
| Title | Structure of CFTR bound to (R)-BPO-27 unveils a pore-blockage mechanism. |
|---|---|
| Journal, issue, pages | Nat Commun, Vol. 16, Issue 1, Page 7059, Year 2025 |
| Publish date | Aug 1, 2025 |
 Authors | Paul G Young / Karol Fiedorczuk / Jue Chen /  |
| PubMed Abstract | Hyperactivation of the cystic fibrosis transmembrane conductance regulator (CFTR) contributes to secretory diarrhea, a major cause of pediatric mortality worldwide, and autosomal dominant polycystic ...Hyperactivation of the cystic fibrosis transmembrane conductance regulator (CFTR) contributes to secretory diarrhea, a major cause of pediatric mortality worldwide, and autosomal dominant polycystic kidney disease (ADPKD), the most common inherited cause of end-stage renal disease. Selective CFTR inhibition is a potential therapeutic strategy, with (R)-BPO-27 emerging as a promising candidate. Here, we present a cryo-EM structure of CFTR bound to (R)-BPO-27 at an overall resolution of 2.1 Å. Contrary to the previous hypothesis that it inhibits CFTR current by competition with ATP, we demonstrate that (R)-BPO-27 instead directly occludes the chloride-conducting pore while permitting ATP hydrolysis, thus uncoupling the two activities. Furthermore, we find that inhibitor binding requires some degree of NBD separation, as the inhibition rate inversely correlates with the probability NBD dimerization. These findings clarify the compound's mechanism and provide a molecular basis for optimizing its clinical potential. |
 External links | Nat Commun / PubMed:40750590 / PubMed Central |
| Methods | EM (single particle) |
| Resolution | 2.1 Å |
| Structure data | EMDB-48717, PDB-9mxl: |
| Chemicals |  PDB-1buj:  ChemComp-MG:  ChemComp-ATP:  ChemComp-CL:  ChemComp-HOH: |
| Source |
|
 Keywords | MEMBRANE PROTEIN / Inhibitor / CFTR |
homo sapiens (human)