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- W1979483669 abstract "Rat liver mitochondria accumulate iron partly by an energy-dependent and partly by an energy-independent mechanism [ 11. The energy-dependent accumulation has several features in common with the uncoupler-sensitive high-affinity binding of Ca* [2,3] , and the iron thus accumulated is partitioned between the matrix and inner membrane [4]. Thus, the ability of rat liver mitochondria to carry out energy-dependent accumulation of iron seems hardly less remarkable than their capacity for energy-dependent accumulation of other cations (for review, see ref. [ 151). Nevertheless the iron accumulation process reveals some. peculiarities related to the strong complex-binding properties of the iron ions, e.g. the energy-dependent accumulation is inhibited by addition of substrates, ATP ( > 50 PM) or inorganic phosphate [6]. On the other hand, the energy-dependent accumulation can be increased by approx. 50% when coupled to valinomycin-induced K+-efflux [6] . Furthermore in a recent paper it was shown that energy-dependent accumulation of iron by mitochondria isolated from rabbit reticulocytes amounts to 2-3 times that taken up by rat liver mitochondria [7]. This observation is of considerable importance in view of the specialized function of reticulocytes in iron metabolism and heme synthesis [8,9] . In the present paper these studies have been extended to mitochondria isolated from other tissues and species to determined whether differences exist that might be relevant to the biological role of mitochondria in iron metabolism [7-l 0] , and it is concluded that whereas no species differences exist, there are" @default.
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- W1979483669 date "1974-07-15" @default.
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- W1979483669 title "Energy-dependent accumulation of iron by mitochondria isolated from different tissues and species" @default.
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- W1979483669 doi "https://doi.org/10.1016/0014-5793(74)80987-7" @default.
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