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- W1553447712 abstract "Abstract A reversible association of magnesium with beef heart submitochondrial particles was monitored with the use of the fluorescent chelate probe, chlorotetracycline, and direct measurement of the magnesium content of the membranes under various conditions. Addition of an oxidizable substrate, such as succinate, or ATP to the submitochondrial particles caused an energization of the membranes and the release of up to 50% of the magnesium from the particles. The release of magnesium was prevented by the addition of uncoupler, antimycin A, or malonate, each of which prevented the establishment of the energized state of the mitochondrial membranes. Following the energized release of magnesium from the particles, the addition of compounds leading to deenergization caused a rapid, nearly complete reassociation of magnesium with the membranes. Although energization of the submitochondrial particles was not dependent upon either a high level of membrane-associated magnesium or the actual release of magnesium from the membrane, the rapid release of magnesium was dependent upon the establishment of the high energy state. It was also apparent that the magnesium content of the membranes determined the amount of chlorotetracycline which was bound to the membrane, i.e. the greater the magnesium content, the greater the amount of chelate probe which was bound to the particles. The membrane-associated magnesium which was capable of being released from the particles upon energization was not accessible to polar chelators such as ethylenediaminetetraacetate, but was accessible to the lipophilic chelator, o-phenanthroline. These studies suggest that the ratio of bound to free magnesium within the mitochondrion may be regulated by an energy-dependent, reversible association of magnesium with the mitochondrial membranes." @default.
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- W1553447712 date "1973-12-01" @default.
- W1553447712 modified "2023-10-14" @default.
- W1553447712 title "Energy-dependent Release of Magnesium from Beef Heart Submitochondrial Particles" @default.
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- W1553447712 doi "https://doi.org/10.1016/s0021-9258(19)43143-8" @default.
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