ジャーナル: Nat Commun / 年: 2025 タイトル: Structural basis of apoptosis induction by the mitochondrial voltage-dependent anion channel. 著者: Melina Daniilidis / Umut Günsel / Georgios Broutzakis / Kira D Leitl / Robert Janowski / Kai Fredriksson / Dierk Niessing / Christos Gatsogiannis / Franz Hagn / 要旨: The voltage-dependent anion channel (VDAC) is the main gateway for metabolites across the mitochondrial outer membrane. VDAC oligomers are connected to apoptosis induced by various stimuli. However, ...The voltage-dependent anion channel (VDAC) is the main gateway for metabolites across the mitochondrial outer membrane. VDAC oligomers are connected to apoptosis induced by various stimuli. However, the mechanistic and structural basis of apoptosis induction by VDAC remains poorly understood. Here, using cryo-EM and NMR we show that VDAC1 oligomerization or confinement in small lipid nanodiscs triggers the exposure of its N-terminal α-helix (VDAC1-N) which becomes available for partner protein binding. NMR and X-ray crystallography data show that VDAC1-N forms a complex with the BH3 binding groove of the anti-apoptotic Bcl2 protein BclxL. Biochemical assays demonstrate that VDAC1-N exhibits a pro-apoptotic function by promoting pore formation of the executor Bcl2 protein Bak via neutralization of BclxL. This mechanism is reminiscent of BH3-only sensitizer Bcl2 proteins that are efficient inducers of Bax/Bak-mediated mitochondrial outer membrane permeabilization and ultimately apoptosis. The VDAC pathway most likely responds to mitochondrial stress or damage.
プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray
放射波長
波長: 0.99999 Å / 相対比: 1
反射
解像度: 1.95→50 Å / Num. obs: 12735 / % possible obs: 98.7 % / 冗長度: 4.1 % / CC1/2: 0.997 / Net I/σ(I): 12.6
反射 シェル
解像度: 1.95→2 Å / Mean I/σ(I) obs: 2.3 / Num. unique obs: 1012 / CC1/2: 0.802
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解析
ソフトウェア
名称
バージョン
分類
REFMAC
5.8.0425
精密化
XDS
データ削減
SCALA
データスケーリング
PHASER
位相決定
精密化
構造決定の手法: 分子置換 / 解像度: 1.95→44.64 Å / Cor.coef. Fo:Fc: 0.963 / Cor.coef. Fo:Fc free: 0.947 / SU B: 3.551 / SU ML: 0.099 / 交差検証法: THROUGHOUT / ESU R: 0.153 / ESU R Free: 0.134 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.20055
677
5 %
RANDOM
Rwork
0.16972
-
-
-
obs
0.17135
12735
98.65 %
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溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK