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Alpha-tocopheryl succinate induces apoptosis by targeting ubiquinone-binding sites in mitochondrial respiratory complex II

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027162%3A_____%2F08%3A%230000328" target="_blank" >RIV/00027162:_____/08:#0000328 - isvavai.cz</a>

  • Alternative codes found

    RIV/86652036:_____/08:00313507

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Alpha-tocopheryl succinate induces apoptosis by targeting ubiquinone-binding sites in mitochondrial respiratory complex II

  • Original language description

    Alpha-tocopheryl succinate is a selective inducer of apoptosis in cancer cells. The molecular target of alpha-TOS has not been identified. Here, we show that alpha-TOS inhibits succinate dehydrogenase (SDH) activity of complex II (CII) by interacting with the proximal and distal ubiquinone (UbQ)-binding site (Q(P) and Q(D), respectively). This is based on biochemical analyses and molecular modelling, revealing similar or stronger interaction energy of alpha-TOS compared to that of UbQ for the Q(P) and Q(D) sites, respectively. CybL-mutant cells with dysfunctional CII failed to accumulate ROS and underwent apoptosis in the presence of alpha-TOS. Reconstitution of functional CII rendered CybL-mutant cells susceptible to alpha-TOS. We propose that alpha-TOS displaces UbQ in CII causing electrons generated by SDH to recombine with molecular oxygen to yield ROS. Our data highlight CII, a known tumour suppressor, as a novel target for cancer therapy.

  • Czech name

    Alfa-tokoferyl sukcinát indukuje apoptózu interakcí s mitochondriálním repiračním komplexem II v oblasti vazných míst pro ubichinon

  • Czech description

    Alfa-tokoferyl sukcinát je selektivní induktor apoptózy nádorových buněk. Alfa-tokoferyl sukcinát (alfa-TOS) je selektivní induktor apoptózy nádorových buněk, což zahrnuje akumulaci kyslíkových radikálů (ROS). Ukazujeme, že alfa-TOS inhibuje aktivitu SDHkomplexu II (CII) interakcí s proximálním Q(P) a distálním Q(D) vazným místem pro ubichinon (UbQ). Buňky nesoucí mutaci na genu pro komplex II, nejsou citlivé na alfa -TOS a neprodukují ROS. Zavedení funkčního CII do těchto buněk, jim způsobilo citlivost na alfa -TOS. Navrhujeme, že alfa -TOS vytěsňuje UbQ z CII a způsobuje tvorbu kyslíkových radikálů. Naše data poukazují na CII jako na nový cíl v protinádorové terapii.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CE - Biochemistry

  • OECD FORD branch

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2008

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Oncogene

  • ISSN

    0950-9232

  • e-ISSN

  • Volume of the periodical

    27

  • Issue of the periodical within the volume

    31

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    12

  • Pages from-to

  • UT code for WoS article

    000257691100007

  • EID of the result in the Scopus database