Apr 25, 1976

Reconstitution and characterization of the adenine nucleotide transporter derived from bovine heart mitochondria

The Journal of Biological Chemistry
H G Shertzer, E Racker


1. Adenine nucleotide exchange-transport was reconstituted in vesicles prepared from phospholipids and protein fractions derived from bovine heart submitochondrial particles. The transport, which was specific for ATP and ADP was measured either as ADP/ADP, ATP/ATP, or ADP/ATP exchange. The highest specific activity (370 nanomoles of ADP/ADP exchange/min/mg of protein at room temperature) was obtained with a protein fraction prepared by cholate extraction of partly resolved submitochondrial particles followed by ammonium sulfate fractionation. 2. At 200 muM external nucleotide, the exchange reactions were inhibited by low concentrations of bongkrekate, atractyloside, and palmitoyl-CoA, with Ki values of 1.8, 3.0, and 7.5 muM, respectively. The ADP/ADP nucleotide exchange was stimulated about 5-fold by 500 muM MgCl2 or MnCl2(km of 40 muM) and about 3-fold by 500 muM CaCl2(Km of 90 muM). It was optimal between pH 6.0 and 7.0 and decreased rapidly above pH 7.5. Arrhenius plots between 0 degrees and 40 degrees showed a break point at 15 degrees with soybean phospholipids and an activation energy of 29.5 kcal/mole from 0 degrees-15 degrees and 9.0 kcal/mole from 15 degrees-40 degrees. With mitochondrial phospholipids the break point ...Continue Reading

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Mentioned in this Paper

Uncoupling Agents
Mitochondrial ADP, ATP Translocases
Mitochondria, Muscle
Bos indicus
Hydrogen-Ion Concentration

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