A versatile platform to analyze low-affinity and transient protein-protein interactions in living cells in real time.

A versatile platform to analyze low-affinity and transient protein-protein interactions in living cells in real time.
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DOI:
10.1016/j.celrep.2014.10.058
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发表时间:
2014-12-11
期刊:
影响因子:
8.8
通讯作者:
Wahl GM
Wahl GM
中科院分区:
生物学1区
文献类型:
--
作者:
Li YC;Rodewald LW;Hoppmann C;Wong ET;Lebreton S;Safar P;Patek M;Wang L;Wertman KF;Wahl GM

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蛋白质-蛋白质相互作用(PPI)在协调生物过程中发挥着核心作用。虽然有些PPI是稳定的,但许多重要的PPI是暂时的,很难用传统方法检测到。我们开发了ReBiL,一个重组酶增强的双分子荧光素酶互补平台,能够在活细胞中检测微弱的PPI。ReBiL很容易发现E3泛素连接酶和E2泛素结合酶之间具有挑战性的瞬时相互作用。ReBiL在不同条件下快速检测PPI的能力表明,一些装订的α-螺旋多肽是一类新的PPI拮抗剂,可以诱导靶点非依赖性的胞浆渗漏和细胞毒作用,这种作用可以被血清拮抗。这些结果解释了无血清条件下检测装订多肽活性的要求,并定义了评估多肽拮抗剂方法所需的参数。ReBiL能够加快PPI分析、评估靶点特异性和细胞渗透性,并揭示PPI修饰剂的非靶点效应,这应该有助于开发有效的、细胞渗透性的PPI疗法,并阐述不同的生物学机制。
Protein-protein interactions (PPIs) play central roles in orchestrating biological processes. While some PPIs are stable, many important ones are transient and hard to detect with conventional approaches. We developed ReBiL, a recombinase enhanced bimolecular luciferase complementation platform, to enable weak PPI detection in living cells. ReBiL readily identified challenging transient interactions between an E3 ubiquitin ligase and an E2 ubiquitin-conjugating enzyme. ReBiL’s ability to rapidly interrogate PPIs in diverse conditions revealed that some stapled α-helical peptides, a new class of PPI antagonists, induce target-independent cytosolic leakage and cytotoxicity that is antagonized by serum. These results explain the requirement for serum-free conditions to detect stapled peptide activity, and define a required parameter to evaluate for peptide antagonist approaches. ReBiL’s ability to expedite PPI analysis, assess target specificity and cell permeability, and to reveal off-target effects of PPI modifiers should facilitate development of effective, cell permeable PPI therapeutics and elaboration of diverse biological mechanisms.
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