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- W2000235408 abstract "Cytochromes b 553, b 557, and b 562 of mung bean (Phaseolus aureus) mitochondria become partially reduced with endogenous substrate on addition of antimycin A to the aerobic mitochondrial suspension. Addition of ATP causes partial reoxidation of the three cytochromes. This partial oxidation by ATP is inhibited by oligomycin and reversed by uncoupler. Ubiquinone does not appear to act as electron acceptor for the oxidation reaction, but a nonfluorescent flavoprotein, or possibly ironsulfur protein, component does appear to act as acceptor. This is consistent with reverse electron transport driven by ATP across the first site of energy conservation of the respiratory chain. Endogenous pyridine nucleotide and the fluorescent flavoprotein with Em7.2 = −155mv (midpoint potential at pH 7.2, referred to normal hydrogen electrode) in uncoupled mitochondria become reduced in anaerobiosis attained by oxidation of succinate in the absence of respiratory inhibitors of the cytochrome chain, provided that Pi and ATP are present. Under these same conditions, cytochrome b 557 is completely reduced but cytochrome b 562 remains nearly completely oxidized. There is no equilibration across the first site of energy conservation between the carriers on the low potential side and cytochrome b 562 with Em7.2 = −77mv on the high potential side. It is concluded that cytochrome b 562 is not a part of the main sequence of electron transport carriers of the mitochondrial respiratory chain of plants; it can participate in redox reactions with the respiratory chain in coupled mitochondria but not in uncoupled mitochondria unless antimycin A is present." @default.
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- W2000235408 date "1974-06-01" @default.
- W2000235408 modified "2023-09-24" @default.
- W2000235408 title "The Respiratory Chain of Plant Mitochondria" @default.
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- W2000235408 doi "https://doi.org/10.1104/pp.53.6.840" @default.
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