Abstract
The yeast mitochondrial unspecific channel (YMUC) sensitivity to inorganic (Ca2+ or Mg2+) or organic (hexyl or octyl-guanidine) cations was measured. The rate of oxygen consumption in State 3 and State 4, the transmembrane potential (Δψ), mitochondrial swelling, and the polyethylene-glycol mediated recontraction were used to follow opening of the YMUC. Addition of 0.4 mM PO4 did not close the YMUC, although it did enhance the sensitivity to Ca2+ (I50 decreased from 50 to 0.3 mM) and Mg2+ (I50 decreased from 5 to 0.83 mM Mg2+). The Ca2+ concentration needed to close the YMUC was higher than the concentrations usually observed in the cell. Nonetheless, Mg2+, Ca2+, and PO4 exhibited additive effects. These cations did not inhibit contraction of preswollen mitochondria, suggesting that the YMUC/cation interaction was labile. Octyl-guanidine (OG-I50 7.5 μM) was the only cation which inhibited mitochondrial recontraction, probably as a result of membrane binding stabilization through its hydrophobic tail. The PO4-dependent, Ca2+/Mg2+-mediated closure of the YMUC may be a means to control the proportion of oxidative energy producing ATP or being lost as heat.
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Pérez-Vázquez, V., Saavedra-Molina, A. & Uribe, S. In Saccharomyces cerevisiae, Cations Control the Fate of the Energy Derived from Oxidative Metabolism Through the Opening and Closing of the Yeast Mitochondrial Unselective Channel. J Bioenerg Biomembr 35, 231–241 (2003). https://doi.org/10.1023/A:1024659615022
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DOI: https://doi.org/10.1023/A:1024659615022