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- W2023006253 abstract "Abstract 1. Rabbit reticulocyte mitochondria isolated in a medium of sucrose, N -2-hydroxyethylpiperazine- N ′-2-ethanesulfonic acid and bovine serum albumin rapidly accumulate iron from the suspending medium when 59 Fe(III)-sucrose is used as a soluble and stable model complex. 2. As in liver mitochondria (Romslo, I. and Flatmark, T. (1973) Biochim. Biophys. Acta 305, 29–40) the accumulation proceeds by two different mechanisms, i.e. by an energy-independent and an energy-dependent (uncoupler-sensitive) mechanism. The energy-dependent accumulation is inhibited to approx. 80 % by cyanide. 3. The reticulocyte mitochondria possess high- and low-affinity binding sites of iron as recently reported for rat liver mitochondria (Romslo, I. and Flatmark, T. (1973) Biochim. Biophys. Acta 325, 38–46). At pH 7.4 the low-affinity sites bind about 110 nmoles of iron per mg of protein with K ′ m ≈ 0.3 mM. The high-affinity sites bind about 28 nmoles of iron per mg of protein with K ′ m ≈ 50 μ M, and the binding is completely inhibited by the uncoupler carbonyl cyanide m -chlorophenylhydrazone. 4. By comparing the energy-dependent accumulation of iron and calcium in mitochondria from reticulocytes and different organs, it is found that iron accumulation (in State 1) relative to calcium (in State 4) is favoured in reticulocytes by a factor of 5 (relative to liver) to 40 (relative to heart)." @default.
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- W2023006253 date "1974-07-01" @default.
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- W2023006253 title "Energy-dependent accumulation of iron by isolated rabbit reticulocyte mitochondria" @default.
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- W2023006253 doi "https://doi.org/10.1016/0005-2728(74)90109-1" @default.
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