A redox switch regulates the structure and function of anti-apoptotic BFL-1.
A redox switch regulates the structure and function of anti-apoptotic BFL-1.
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DOI:
10.1038/s41594-020-0458-9
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发表时间:
2020-09
影响因子:
16.8
通讯作者:
Walensky LD
中科院分区:
文献类型:
--
作者:
Korshavn KJ;Wales TE;Bird GH;Engen JR;Walensky LD
Apoptosis is regulated by BCL-2 family proteins. Anti-apoptotic members suppress cell death by deploying a surface groove to capture the critical BH3 α-helix of pro-apoptotic members. Cancer cells hijack this mechanism by overexpressing anti-apoptotic BCL-2 family proteins to enforce cellular immortality. We previously identified and harnessed a unique cysteine (C55) in the groove of anti-apoptotic BFL-1 to selectively neutralize its oncogenic activity using a covalent stapled-peptide inhibitor. Here, we find that disulfide-bonding between a native cysteine pair at the groove (C55) and C-terminal α9 helix (C175) of BFL-1 operates as a redox switch to control the accessibility of the anti-apoptotic pocket. Reducing the C55-C175 disulfide triggers α9 release, which promotes mitochondrial translocation, groove exposure for BH3 interaction, and inhibition of mitochondrial permeabilization by pro-apoptotic BAX. C55-C175 disulfide-formation in an oxidative cellular environment abrogates the ability of BFL-1 to bind BH3 domains. Thus, we identify a mechanism of conformational control of BFL-1 by an intramolecular redox switch.
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通讯作者:
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通讯作者:
Walensky, Loren D.