ジャーナル: Structure / 年: 2020 タイトル: Lipid Interactions of a Ciliary Membrane TRP Channel: Simulation and Structural Studies of Polycystin-2. 著者: Qinrui Wang / Robin A Corey / George Hedger / Prafulla Aryal / Mariana Grieben / Chady Nasrallah / Agnese Baronina / Ashley C W Pike / Jiye Shi / Elisabeth P Carpenter / Mark S P Sansom / 要旨: Polycystin-2 (PC2) is a transient receptor potential (TRP) channel present in ciliary membranes of the kidney. PC2 shares a transmembrane fold with other TRP channels, in addition to an extracellular ...Polycystin-2 (PC2) is a transient receptor potential (TRP) channel present in ciliary membranes of the kidney. PC2 shares a transmembrane fold with other TRP channels, in addition to an extracellular domain found in TRPP and TRPML channels. Using molecular dynamics (MD) simulations and cryoelectron microscopy we identify and characterize PIP and cholesterol interactions with PC2. PC2 is revealed to have a PIP binding site close to the equivalent vanilloid/lipid binding site in the TRPV1 channel. A 3.0-Å structure reveals a binding site for cholesterol on PC2. Cholesterol interactions with the channel at this site are characterized by MD simulations. The two classes of lipid binding sites are compared with sites observed in other TRPs and in Kv channels. These findings suggest PC2, in common with other ion channels, may be modulated by both PIPs and cholesterol, and position PC2 within an emerging model of the roles of lipids in the regulation and organization of ciliary membranes.
モデルのタイプ: OTHER / 詳細: ab-initio model generated in RELION
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: 3.39 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3) 詳細: Final autorefinement was carried out in RELION without masking giving an unmasked (FSC 0.143) resolution of 3.82. Masking to remove the detergent micelle gave a final resolution of 3.39A 使用した粒子像数: 37297
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3)
最終 3次元分類
クラス数: 10 / 平均メンバー数/クラス: 8200 / ソフトウェア - 名称: RELION (ver. 3) 詳細: Final 3D classification carried out in 10 classes with no image alignment after 3D autorefinement with C4 symmetry
FSC曲線 (解像度の算出)
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原子モデル構築 1
精密化
空間: REAL / プロトコル: AB INITIO MODEL / 温度因子: 109
得られたモデル
PDB-6t9o: CryoEM structure of human polycystin-2/PKD2 in UDM supplemented with PI(3,5)P2