ジャーナル: Nat Struct Mol Biol / 年: 2017 タイトル: Structure of the polycystic kidney disease TRP channel Polycystin-2 (PC2). 著者: Mariana Grieben / Ashley C W Pike / Chitra A Shintre / Elisa Venturi / Sam El-Ajouz / Annamaria Tessitore / Leela Shrestha / Shubhashish Mukhopadhyay / Pravin Mahajan / Rod Chalk / Nicola A ...著者: Mariana Grieben / Ashley C W Pike / Chitra A Shintre / Elisa Venturi / Sam El-Ajouz / Annamaria Tessitore / Leela Shrestha / Shubhashish Mukhopadhyay / Pravin Mahajan / Rod Chalk / Nicola A Burgess-Brown / Rebecca Sitsapesan / Juha T Huiskonen / Elisabeth P Carpenter / 要旨: Mutations in either polycystin-1 (PC1 or PKD1) or polycystin-2 (PC2, PKD2 or TRPP1) cause autosomal-dominant polycystic kidney disease (ADPKD) through unknown mechanisms. Here we present the ...Mutations in either polycystin-1 (PC1 or PKD1) or polycystin-2 (PC2, PKD2 or TRPP1) cause autosomal-dominant polycystic kidney disease (ADPKD) through unknown mechanisms. Here we present the structure of human PC2 in a closed conformation, solved by electron cryomicroscopy at 4.2-Å resolution. The structure reveals a novel polycystin-specific 'tetragonal opening for polycystins' (TOP) domain tightly bound to the top of a classic transient receptor potential (TRP) channel structure. The TOP domain is formed from two extensions to the voltage-sensor-like domain (VSLD); it covers the channel's endoplasmic reticulum lumen or extracellular surface and encloses an upper vestibule, above the pore filter, without blocking the ion-conduction pathway. The TOP-domain fold is conserved among the polycystins, including the homologous channel-like region of PC1, and is the site of a cluster of ADPKD-associated missense variants. Extensive contacts among the TOP-domain subunits, the pore and the VSLD provide ample scope for regulation through physical and chemical stimuli.
凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 85 K / 装置: FEI VITROBOT MARK IV 詳細: 3 microlitres were applied to the grid and blotted for 3secs prior to plunge in liquid ethane.
詳細
Sample was monodisperse after size exclusion chromatography
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電子顕微鏡法
顕微鏡
FEI POLARA 300
特殊光学系
エネルギーフィルター - 名称: GIF Quantum エネルギーフィルター - エネルギー下限: 0 eV エネルギーフィルター - エネルギー上限: 20 eV
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 検出モード: COUNTING / デジタル化 - 画像ごとのフレーム数: 1-22 / 撮影したグリッド数: 1 / 実像数: 758 / 平均露光時間: 8.8 sec. / 平均電子線量: 45.1 e/Å2 詳細: Images were collected in movie-mode at 2.5 frames per second for a duration of 8.8secs
試料ホルダーモデル: SIDE ENTRY, EUCENTRIC / ホルダー冷却材: NITROGEN
実験機器
モデル: Tecnai Polara / 画像提供: FEI Company
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画像解析
粒子像選択
選択した数: 161965 詳細: Particles were autopicked using CTF-corrected template based picking algorithm in RELION using selected 2D class averages based on manually picked particles.
初期モデル
モデルのタイプ: OTHER 詳細: Initial model generated from a projection of a side view 2D class average
最終 再構成
使用したクラス数: 1 / 想定した対称性 - 点群: C4 (4回回転対称) / 解像度のタイプ: BY AUTHOR / 解像度: 4.22 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 1.3) 詳細: Resolution determined by gold-standard FSC procedure as implemented in RELION 使用した粒子像数: 19546