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-Structure paper
タイトル | The structural basis of lipid scrambling and inactivation in the endoplasmic reticulum scramblase TMEM16K. |
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ジャーナル・号・ページ | Nat Commun, Vol. 10, Issue 1, Page 3956, Year 2019 |
掲載日 | 2019年9月2日 |
著者 | Simon R Bushell / Ashley C W Pike / Maria E Falzone / Nils J G Rorsman / Chau M Ta / Robin A Corey / Thomas D Newport / John C Christianson / Lara F Scofano / Chitra A Shintre / Annamaria Tessitore / Amy Chu / Qinrui Wang / Leela Shrestha / Shubhashish M M Mukhopadhyay / James D Love / Nicola A Burgess-Brown / Rebecca Sitsapesan / Phillip J Stansfeld / Juha T Huiskonen / Paolo Tammaro / Alessio Accardi / Elisabeth P Carpenter / |
PubMed 要旨 | Membranes in cells have defined distributions of lipids in each leaflet, controlled by lipid scramblases and flip/floppases. However, for some intracellular membranes such as the endoplasmic ...Membranes in cells have defined distributions of lipids in each leaflet, controlled by lipid scramblases and flip/floppases. However, for some intracellular membranes such as the endoplasmic reticulum (ER) the scramblases have not been identified. Members of the TMEM16 family have either lipid scramblase or chloride channel activity. Although TMEM16K is widely distributed and associated with the neurological disorder autosomal recessive spinocerebellar ataxia type 10 (SCAR10), its location in cells, function and structure are largely uncharacterised. Here we show that TMEM16K is an ER-resident lipid scramblase with a requirement for short chain lipids and calcium for robust activity. Crystal structures of TMEM16K show a scramblase fold, with an open lipid transporting groove. Additional cryo-EM structures reveal extensive conformational changes from the cytoplasmic to the ER side of the membrane, giving a state with a closed lipid permeation pathway. Molecular dynamics simulations showed that the open-groove conformation is necessary for scramblase activity. |
リンク | Nat Commun / PubMed:31477691 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 3.2 - 5.14 Å |
構造データ | EMDB-4746, PDB-6r7x: EMDB-4747, PDB-6r7y: EMDB-4748, PDB-6r7z: PDB-5oc9: PDB-6r65: |
化合物 | ChemComp-CA: ChemComp-79M: ChemComp-HOH: ChemComp-PC1: ChemComp-UMQ: |
由来 |
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キーワード | LIPID TRANSPORT / MEMBRANE PROTEIN / CALCIUM ACTIVATION / TRANSPORT PROTEIN / Structural Genomics / Structural Genomics Consortium / SGC |