National Institutes of Health/National Cancer Institute (NIH/NCI)
R21 AG061697 01
米国
引用
ジャーナル: Mol Cell / 年: 2019 タイトル: Unique Structural Features of the Mitochondrial AAA+ Protease AFG3L2 Reveal the Molecular Basis for Activity in Health and Disease. 著者: Cristina Puchades / Bojian Ding / Albert Song / R Luke Wiseman / Gabriel C Lander / Steven E Glynn / 要旨: Mitochondrial AAA+ quality-control proteases regulate diverse aspects of mitochondrial biology through specialized protein degradation, but the underlying mechanisms of these enzymes remain poorly ...Mitochondrial AAA+ quality-control proteases regulate diverse aspects of mitochondrial biology through specialized protein degradation, but the underlying mechanisms of these enzymes remain poorly defined. The mitochondrial AAA+ protease AFG3L2 is of particular interest, as genetic mutations localized throughout AFG3L2 are linked to diverse neurodegenerative disorders. However, a lack of structural data has limited our understanding of how mutations impact enzymatic function. Here, we used cryoelectron microscopy (cryo-EM) to determine a substrate-bound structure of the catalytic core of human AFG3L2. This structure identifies multiple specialized structural features that integrate with conserved motifs required for ATP-dependent translocation to unfold and degrade targeted proteins. Many disease-relevant mutations localize to these unique structural features of AFG3L2 and distinctly influence its activity and stability. Our results provide a molecular basis for neurological phenotypes associated with different AFG3L2 mutations and establish a structural framework to understand how different members of the AAA+ superfamily achieve specialized biological functions.
詳細: DTT and ATP were added fresh before sample preparation
グリッド
モデル: Quantifoil, UltrAuFoil, R1.2/1.3 / 材質: GOLD / メッシュ: 300 / 前処理 - タイプ: PLASMA CLEANING / 前処理 - 時間: 6 sec. / 前処理 - 雰囲気: OTHER 詳細: Grids were plasma cleaned using a Solarus plasma cleaner (Gatan, Inc.).
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 278 K / 装置: FEI VITROBOT MARK III 詳細: Sample was blotted for 3 seconds using Whatman No. 1 filter paper immediately prio to plunge-freezing..
想定した対称性 - 点群: C1 (非対称) / アルゴリズム: BACK PROJECTION / 解像度のタイプ: BY AUTHOR / 解像度: 3.0 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.0) 詳細: Multi-body refinement was used to generate 3 different reconstructions that were stitched together 使用した粒子像数: 1129437
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: RELION (ver. 3.0)