Photocatalytic proximity labelling of MCL-1 by a BH3 ligand.

Photocatalytic proximity labelling of MCL-1 by a BH3 ligand.
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DOI:
10.1038/s42004-019-0235-z
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发表时间:
2019-11-21
影响因子:
5.9
通讯作者:
Bon RS
Bon RS
中科院分区:
化学2区
文献类型:
--
作者:
Beard HA;Hauser JR;Walko M;George RM;Wilson AJ;Bon RS

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配体导向的蛋白质标记允许在不需要遗传编码标签的情况下将多种化学功能引入蛋白质。在这里,我们报告了一种快速标记蛋白质的方法,使用钌-联吡啶基(Ru(II)(bpy)3)修饰肽来模拟BCL-2家族蛋白-蛋白相互作用中的BH3配体。使用亚化学计量量的(Ru(II)(bpy)3)修饰的NOXA-B,并在可见光照射下照射1分钟,抗凋亡蛋白MCL-1可以被各种功能标签光标记。与之前关于Ru(II)(bpy)3介导的光标记的报道相反,串联质谱实验显示标记位点是MCL-1的半胱氨酸残基。MCL-1可以选择性地与其他蛋白(包括结构相关的BCL-2成员BCL-xL)混合标记。这些结果表明,邻近诱导的光标记适用于介导蛋白质-蛋白质相互作用的界面,并为未来使用配体导向的邻近标记来动态分析BCL-2家族蛋白的相互作用组铺平了道路。
Ligand-directed protein labelling allows the introduction of diverse chemical functionalities onto proteins without the need for genetically encoded tags. Here we report a method for the rapid labelling of a protein using a ruthenium-bipyridyl (Ru(II)(bpy)3)-modified peptide designed to mimic an interacting BH3 ligand within a BCL-2 family protein-protein interactions. Using sub-stoichiometric quantities of (Ru(II)(bpy)3)-modified NOXA-B and irradiation with visible light for 1 min, the anti-apoptotic protein MCL-1 can be photolabelled with a variety of functional tags. In contrast with previous reports on Ru(II)(bpy)3-mediated photolabelling, tandem mass spectrometry experiments reveal that the labelling site is a cysteine residue of MCL-1. MCL-1 can be labelled selectively in mixtures with other proteins, including the structurally related BCL-2 member, BCL-xL. These results demonstrate that proximity-induced photolabelling is applicable to interfaces that mediate protein-protein interactions, and pave the way towards future use of ligand-directed proximity labelling for dynamic analysis of the interactome of BCL-2 family proteins.
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