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Redox-Inactive Peptide Disrupting Trx1–Ask1 Interaction for Selective Activation of Stress Signaling
Biochemistry ( IF 2.9 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acs.biochem.7b01083
Dilini N. Kekulandara 1 , Shima Nagi 1 , Hyosuk Seo 1 , Christine S. Chow 1 , Young-Hoon Ahn 1
Affiliation  

Thioredoxin 1 (Trx1) and glutaredoxin 1 (Grx1) are two ubiquitous redox enzymes that are central for redox homeostasis but also are implicated in many other processes, including stress sensing, inflammation, and apoptosis. In addition to their enzymatic redox activity, a growing body of evidence shows that Trx1 and Grx1 play regulatory roles via protein–protein interactions with specific proteins, including Ask1. The currently available inhibitors of Trx1 and Grx1 are thiol-reactive electrophiles or disulfides that may suffer from low selectivity because of their thiol reactivity. In this report, we used a phage peptide library to identify a 7-mer peptide, 2GTP1, that binds to both Trx1 and Grx1. We further showed that a cell-permeable derivative of 2GTP1, TAT-2GTP1, disrupts the Trx1–Ask1 interaction, which induces Ask1 phosphorylation with subsequent activation of JNK, stabilization of p53, and reduced viability of cancer cells. Notably, as opposed to a disulfide-derived Trx1 inhibitor (PX-12), TAT-2GTP1 was selective for activating the Ask1 pathway without affecting other stress signaling pathways, such as endoplasmic reticulum stress and AMPK activation. Overall, 2GTP1 will serve as a useful probe for investigating protein interactions of Trx1.

中文翻译:

氧化还原非活性肽破坏Trx1-Ask1相互作用的应力信号的选择性激活。

硫氧还蛋白1(Trx1)和戊二醛还原酶1(Grx1)是两种普遍存在的氧化还原酶,它们是氧化还原稳态的核心,但也涉及许多其他过程,包括压力感测,炎症和细胞凋亡。除了它们的酶氧化还原活性外,越来越多的证据表明,Trx1和Grx1通过蛋白质与特定蛋白质(包括Ask1)的蛋白质相互作用来发挥调节作用。目前可用的Trx1和Grx1抑制剂是硫醇反应性亲电试剂或二硫化物,由于它们的硫醇反应性而可能具有较低的选择性。在本报告中,我们使用噬菌体肽库来鉴定与Trx1和Grx1都结合的7-mer肽2GTP1。我们进一步证明2GTP1的细胞可渗透衍生物TAT-2GTP1破坏了Trx1–Ask1的相互作用,它会诱导Ask1磷酸化,并随后激活JNK,稳定p53并降低癌细胞的生存能力。值得注意的是,与二硫化物衍生的Trx1抑制剂(PX-12)相反,TAT-2GTP1具有选择性激活Ask1途径的功能,而不会影响其他应激信号传导途径,例如内质网应激和AMPK激活。总体而言,2GTP1将作为研究Trx1蛋白质相互作用的有用探针。
更新日期:2018-01-05
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