α-Tocopheryl succinate induces apoptosis by targeting ubiquinone-binding sites in mitochondrial respiratory complex II

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Title α-Tocopheryl succinate induces apoptosis by targeting ubiquinone-binding sites in mitochondrial respiratory complex II
Author Dong, Lan-feng; Low, Pauline; Dyason, Jeffrey Clifford; Wang, Xiufang; Prochazka, L; Witting, PK; Freeman, Ruth; Swettenham, E; Valis, K; Liu, James; Zobalova, Renata; Turanek, J; Spitz, DR; Domann, FE; Scheffler, IE; Ralph, Stephen John; Neuzil, Jiri
Journal Name Oncogene
Editor Dr. E Premkumar Reddy, Dr. John Jenkins
Year Published 2008
Place of publication United Kingdom
Publisher Macmillan Publishers Limited
Abstract α-Tocopheryl succinate (α-TOS) is a selective inducer of apoptosis in cancer cells, which involves the accumulation of reactive oxygen species (ROS). The molecular target of α-TOS has not been identified. Here, we show that α-TOS inhibits succinate dehydrogenase (SDH) activity of complex II (CII) by interacting with the proximal and distal ubiquinone (UbQ)-binding site (QP and QD, respectively). This is based on biochemical analyses and molecular modelling, revealing similar or stronger interaction energy of α-TOS compared to that of UbQ for the QP and QD sites, respectively. CybL-mutant cells with dysfunctional CII failed to accumulate ROS and underwent apoptosis in the presence of α-TOS. Similar resistance was observed when CybL was knocked down with siRNA. Reconstitution of functional CII rendered CybL-mutant cells susceptible to α-TOS. We propose that α-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. © 2008 Macmillan Publishers Limited All rights reserved.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.nature.com/onc/index.html
Alternative URI http://dx.doi.org/10.1038/onc.2008.69
Copyright Statement Copyright 2008 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
Volume 27
Issue Number 31
Page from 4324
Page to 4335
ISSN 0950-9232
Date Accessioned 2009-05-12
Date Available 2010-03-03T06:41:13Z
Language en_AU
Research Centre Griffith Health Institute; Molecular Basis of Disease
Faculty Griffith Health Faculty
Subject Biochemistry and Cell Biology
URI http://hdl.handle.net/10072/23242
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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