Abstract
Ubiquinone derivatives modulate the mammalian mitochondrial Permeability Transition Pore (PTP). Yeast mitochondria harbor a similar structure: the respiration- and ATP-induced Saccharomyces cerevisiae Mitochondrial Unselective Channel ( Sc MUC). Here we show that decylubiquinone, a well-characterized inhibitor of the PTP, suppresses Sc MUC opening in diverse strains and independently of respiratory chain modulation or redox-state. We also found that naturally occurring derivatives such as hexaprenyl and decaprenyl ubiquinones lacked effects on the Sc MUC. The PTP-inactive ubiquinone 5 (Ub5) promoted the Sc MUC-independent activation of the respiratory chain in most strains tested. In an industrial strain however, Ub5 blocked the protection elicited by dUb. The results indicate the presence of a ubiquinone-binding site in the Sc MUC.
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Abbreviations
- dUb:
-
Decylubiquinone
- dVO4 :
-
Decavanadate
- Δψ:
-
Mitochondrial transmembrane potential
- FCCP:
-
Carbonyl cyanide p-trifluoro-methoxyphenyl-hydrazone
- Cyclosporine A:
-
CsA
- PTP:
-
Mitochondrial permeability transition pore
- Sc MUC:
-
Saccharomyces cerevisiae mitochondrial unselective channel
- Ub5 :
-
Ubiquinone 5
- Ub30 :
-
Hexaprenylquinone
- Ub50 :
-
Decaprenylquinone
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Acknowledgments
M.G.-A. is currently supported by an American Heart Association Midwest Affiliate Postdoctoral Fellowship (13POST14060013). HLC is a CONACyT fellow enrolled in the Ms. Sc. Biochemistry program at UNAM. CUA, EGS and MRL are CONACyT fellows enrolled in the Ph. D. Biochemistry program at UNAM. Partially funded by DGAPA/PAPIIT Project IN202612. We acknowledge the technical assistance of Ramón Mendez. Mariana Valenzuela kindly helped to build the figures.
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Gutiérrez-Aguilar, M., López-Carbajal, H.M., Uribe-Alvarez, C. et al. Effects of ubiquinone derivatives on the mitochondrial unselective channel of Saccharomyces cerevisiae . J Bioenerg Biomembr 46, 519–527 (2014). https://doi.org/10.1007/s10863-014-9595-3
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DOI: https://doi.org/10.1007/s10863-014-9595-3