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-Structure paper
タイトル | Structure of a volume-regulated anion channel of the LRRC8 family. |
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ジャーナル・号・ページ | Nature, Vol. 558, Issue 7709, Page 254-259, Year 2018 |
掲載日 | 2018年5月16日 |
著者 | Dawid Deneka / Marta Sawicka / Andy K M Lam / Cristina Paulino / Raimund Dutzler / |
PubMed 要旨 | Volume-regulated anion channels are activated in response to hypotonic stress. These channels are composed of closely related paralogues of the leucine-rich repeat-containing protein 8 (LRRC8) family ...Volume-regulated anion channels are activated in response to hypotonic stress. These channels are composed of closely related paralogues of the leucine-rich repeat-containing protein 8 (LRRC8) family that co-assemble to form hexameric complexes. Here, using cryo-electron microscopy and X-ray crystallography, we determine the structure of a homomeric channel of the obligatory subunit LRRC8A. This protein conducts ions and has properties in common with endogenous heteromeric channels. Its modular structure consists of a transmembrane pore domain followed by a cytoplasmic leucine-rich repeat domain. The transmembrane domain, which is structurally related to connexin proteins, is wide towards the cytoplasm but constricted on the outside by a structural unit that acts as a selectivity filter. An excess of basic residues in the filter and throughout the pore attracts anions by electrostatic interaction. Our work reveals the previously unknown architecture of volume-regulated anion channels and their mechanism of selective anion conduction. |
リンク | Nature / PubMed:29769723 |
手法 | EM (単粒子) / X線回折 |
解像度 | 1.8 - 7.94 Å |
構造データ | EMDB-4361: EMDB-4362: Cryo-EM density of the pore domain of homomeric mLRRC8A volume-regulated anion channel at 3.66 A resolution EMDB-4366: Cryo-EM density of homomeric mLRRC8A volume-regulated anion channel at 5.01 A resolution EMDB-4367: Cryo-EM density of full-length homomeric mLRRC8A volume-regulated anion channel at 4.25 A resolution PDB-6fnw: |
化合物 | ChemComp-EDO: ChemComp-HOH: |
由来 |
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キーワード | MEMBRANE PROTEIN / ion channel / leucine-rich repeat domain / Chloride channel / Swelling-activated / VSOAC / Leucine-rich repeat |