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-Structure paper
タイトル | Conformational Changes of CFTR upon Phosphorylation and ATP Binding. |
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ジャーナル・号・ページ | Cell, Vol. 170, Issue 3, Page 483-491.e8, Year 2017 |
掲載日 | 2017年7月27日 |
著者 | Zhe Zhang / Fangyu Liu / Jue Chen / |
PubMed 要旨 | The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel evolved from an ATP-binding cassette transporter. CFTR channel gating is strictly coupled to phosphorylation and ATP ...The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel evolved from an ATP-binding cassette transporter. CFTR channel gating is strictly coupled to phosphorylation and ATP hydrolysis. Previously, we reported essentially identical structures of zebrafish and human CFTR in the dephosphorylated, ATP-free form. Here, we present the structure of zebrafish CFTR in the phosphorylated, ATP-bound conformation, determined by cryoelectron microscopy to 3.4 Å resolution. Comparison of the two conformations shows major structural rearrangements leading to channel opening. The phosphorylated regulatory domain is disengaged from its inhibitory position; the nucleotide-binding domains (NBDs) form a "head-to-tail" dimer upon binding ATP; and the cytoplasmic pathway, found closed off in other ATP-binding cassette transporters, is cracked open, consistent with CFTR's unique channel function. Unexpectedly, the extracellular mouth of the ion pore remains closed, indicating that local movements of the transmembrane helices can control ion access to the pore even in the NBD-dimerized conformation. |
リンク | Cell / PubMed:28735752 |
手法 | EM (単粒子) |
解像度 | 3.37 Å |
構造データ | |
化合物 | ChemComp-ATP: ChemComp-MG: |
由来 |
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キーワード | HYDROLASE / CFTR / anion channel / ABC transporter / ATP-bound. |