Spontaneous modification of the oxoglutarate translocator in vivo.

in European Journal of Biochemistry (1984), 142

Oxoglutarate translocator of rat-heart mitochondria: regulation by aspartate.

in FEBS Letters (1980), 120

Relations between oxoglutarate transport function and variations of space in rat heart mitochondria (proceedings)]

in Archives Internationales de Physiologie et de Biochimie (1979), 87

The kinetics of oxoglutarate transport in rat heart mitochondria (proceedings)

in Archives Internationales de Physiologie et de Biochimie (1978), 86

Evidence for cooperative effects in the exchange reaction catalysed by the oxoglutarate translocator of rat-heart mitochondria.

in European Journal of Biochemistry (1975), 56(1), 1-14

The initial rates of the exchange external oxoglutarate/internal malate through the inner membrane of rat-heart mitochondria, for various concentrations of the two substrates, have been reinvestigated for ... [more ▼]

The initial rates of the exchange external oxoglutarate/internal malate through the inner membrane of rat-heart mitochondria, for various concentrations of the two substrates, have been reinvestigated for an extended range of concentrations of the external oxoglutarate. This has been made possible by use of the inhibitor-stop technique that allows 100 times smaller incubation times than the centrifugation-stop technique used previously. Under the experimental conditions the uptake of the external-labelled oxoglutarate into the mitochondrial-matrix space is mediated by the oxoglutarate translocator performing a ono-to-one exchange of the anions oxoglutarate (external) and malate (internal). Two intermediary-plateau regions are observed in the kinetic saturation curve of the translocator by the external oxoglutarate, revealing a complex rate equation which is found to be the product of two one-substrate functions. Analysing these features it is shown that the model, proposed earlier, of a "double carrier" as catalyst in a rapid-equilibrium random bi-bi mechanism, is still applicable but that several external binding sites have to be considered. As already noticed the external and the internal substrates bind to their respective sites independently of each other. Furthermore, some additional requirements imposed by the observed kinetics suggest that the exchange reaction is performed by only one translocator species made of identical interacting subunits. The anion exchange is tentatively viewed as a rotation of a subunit around an axis situated in the plane of the membrane after two independent local configuration changes induced by the binding of the two substrates on this subunit. [less ▲]

Kinetics and mechanism of the exchange reactions catalysed by the oxoglutarate translocator of rat-heart mitochondria.

in Biochimie (1973), 55

Mechanism of the exchanges catalysed by the oxoglutarate translocator of rat-heart mitochondria. Kinetics of the external-product inhibition.

in Archives Internationales de Physiologie et de Biochimie (1973), 81