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-Structure paper
タイトル | CFTR function, pathology and pharmacology at single-molecule resolution. |
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ジャーナル・号・ページ | Nature, Vol. 616, Issue 7957, Page 606-614, Year 2023 |
掲載日 | 2023年3月22日 |
著者 | Jesper Levring / Daniel S Terry / Zeliha Kilic / Gabriel Fitzgerald / Scott C Blanchard / Jue Chen / |
PubMed 要旨 | The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel that regulates salt and fluid homeostasis across epithelial membranes. Alterations in CFTR cause cystic fibrosis, a ...The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel that regulates salt and fluid homeostasis across epithelial membranes. Alterations in CFTR cause cystic fibrosis, a fatal disease without a cure. Electrophysiological properties of CFTR have been analysed for decades. The structure of CFTR, determined in two globally distinct conformations, underscores its evolutionary relationship with other ATP-binding cassette transporters. However, direct correlations between the essential functions of CFTR and extant structures are lacking at present. Here we combine ensemble functional measurements, single-molecule fluorescence resonance energy transfer, electrophysiology and kinetic simulations to show that the two nucleotide-binding domains (NBDs) of human CFTR dimerize before channel opening. CFTR exhibits an allosteric gating mechanism in which conformational changes within the NBD-dimerized channel, governed by ATP hydrolysis, regulate chloride conductance. The potentiators ivacaftor and GLPG1837 enhance channel activity by increasing pore opening while NBDs are dimerized. Disease-causing substitutions proximal (G551D) or distal (L927P) to the ATPase site both reduce the efficiency of NBD dimerization. These findings collectively enable the framing of a gating mechanism that informs on the search for more efficacious clinical therapies. |
リンク | Nature / PubMed:36949202 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.3 Å |
構造データ | EMDB-29637, PDB-8fzq: |
化合物 | ChemComp-MG: ChemComp-ATP: |
由来 |
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キーワード | MEMBRANE PROTEIN (膜タンパク質) / Ion Channel (イオンチャネル) |