BAX activation is initiated at a novel interaction site.

BAX activation is initiated at a novel interaction site.
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DOI:
10.1038/nature07396
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发表时间:
2008-10-23
期刊:
影响因子:
64.8
通讯作者:
Walensky, Loren D.
Walensky, Loren D.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gavathiotis, Evripidis;Suzuki, Motoshi;Davis, Marguerite L.;Pitter, Kenneth;Bird, Gregory H.;Katz, Samuel G.;Tu, Ho-Chou;Kim, Hyungjin;Cheng, Emily H. -Y.;Tjandra, Nico;Walensky, Loren D.

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BAX 是 BCL-2 家族的一种促凋亡蛋白,驻留在细胞质中,直到被多种应激刺激激活以诱导细胞死亡。 BCL-2 等抗凋亡蛋白可抵消 BAX 介导的细胞死亡。尽管已经为抗凋亡蛋白定义了赋予生存功能的相互作用位点,但尚未确定 BAX 的激活位点,导致其明确的触发机制未知。我们之前开发了 BCL-2 结构域的稳定 Alpha 螺旋 (SAHB),可直接启动 BAX 介导的线粒体凋亡。在这里,我们通过 NMR 分析证明 BIM SAHB 与 BAX 结合的相互作用位点不同于抗凋亡蛋白的典型结合槽。 BIM SAHB-BAX 相互作用的特异性通过消除功能活性的点突变得到强调,证实 BAX 激活是在这个新的结构位置启动的。因此,我们现在已经定义了用于直接激活的 BAX 相互作用位点,为细胞凋亡的治疗调节建立了新的靶点。
BAX is a pro-apoptotic protein of the BCL-2 family stationed in the cytosol until activated by a diversity of stress stimuli to induce cell death. Anti-apoptotic proteins such as BCL-2 counteract BAX-mediated cell death. Although an interaction site that confers survival functionality has been defined for anti-apoptotic proteins, an activation site has not been identified for BAX, rendering its explicit trigger mechanism unknown. We previously developed Stabilized Alpha-Helix of BCL-2 domains (SAHBs) that directly initiate BAX-mediated mitochondrial apoptosis. Here we demonstrate by NMR analysis that BIM SAHB binds BAX at an interaction site that is distinct from the canonical binding groove characterized for anti-apoptotic proteins. The specificity of the BIM SAHB-BAX interaction is highlighted by point mutagenesis that abrogates functional activity, confirming that BAX activation is initiated at this novel structural location. Thus, we have now defined a BAX interaction site for direct activation, establishing a new target for therapeutic modulation of apoptosis.
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