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The redox-active site of thioredoxin is directly involved in apoptosis signal-regulating kinase 1 binding that is modulated by oxidative stress
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SYSNO ASEP 0524243 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The redox-active site of thioredoxin is directly involved in apoptosis signal-regulating kinase 1 binding that is modulated by oxidative stress Author(s) Pšenáková, Katarína (FGU-C) RID, ORCID
Hexnerová, Rozálie (UOCHB-X) ORCID, RID
Srb, Pavel (UOCHB-X) RID, ORCID
Obšilová, Veronika (FGU-C) RID, ORCID, SAI
Veverka, Václav (UOCHB-X) RID, ORCID
Obšil, Tomáš (FGU-C) RID, ORCIDSource Title FEBS Journal - ISSN 1742-464X
Roč. 287, č. 8 (2020), s. 1626-1644Number of pages 19 s. Language eng - English Country GB - United Kingdom Keywords apoptosis signal-regulating kinase 1 ; mitogen‐activated protein kinase kinase kinase ; oxidative stress ; protein–protein interaction ; thioredoxin Subject RIV CE - Biochemistry OECD category Biochemistry and molecular biology Subject RIV - cooperation Institute of Organic Chemistry and Biochemistry - Biochemistry R&D Projects GA19-00121S GA ČR - Czech Science Foundation (CSF) EF16_019/0000729 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support FGU-C - RVO:67985823 ; UOCHB-X - RVO:61388963 UT WOS 000493743600001 EID SCOPUS 85074781563 DOI 10.1111/febs.15101 Annotation Apoptosis signal‐regulating kinase 1 (ASK1) is a ubiquitously expressed mitogen‐activated protein kinase kinase kinase 5, which mediates various stress signals including oxidative stress. The catalytic activity of ASK1 is tightly controlled by oligomerization and binding of several cofactors. Among these cofactors, thioredoxin stands out as the most important ASK1 inhibitor, but only the reduced form of thioredoxin inhibits ASK1 by direct binding to its N‐terminal domain. In addition, oxidation‐driven thioredoxin dissociation is the key event in oxidative stress‐mediated ASK1 activation. However, the structural mechanism of ASK1 regulation by thioredoxin remains unknown. Here, we report the characterization of the ASK1 domain responsible for thioredoxin binding and its complex using NMR spectroscopy and chemical cross‐linking, thus providing the molecular basis for ASK1: thioredoxin complex dissociation under oxidative stress conditions. Our data reveal that the N‐terminal domain of ASK1 adopts a fold resembling the thioredoxin structure while retaining substantial conformational plasticity at the thioredoxin‐binding interface. Although oxidative stress induces relatively moderate structural changes in thioredoxin, the formation of intramolecular disulfide bridges leads to a considerable conformational rearrangement of the thioredoxin‐binding interface on ASK1. Moreover, the cysteine residue at position 250 of ASK1 is the key element of this molecular switch. Finally, our results show that the redox‐active site of thioredoxin is directly involved in ASK1 binding that is modulated by oxidative stress, thereby identifying a key target for the structure‐based drug design. Workplace Institute of Physiology Contact Lucie Trajhanová, lucie.trajhanova@fgu.cas.cz, Tel.: 241 062 400 Year of Publishing 2021 Electronic address https://doi.org/10.1111/febs.15101
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