Interdependence between chloroplasts and mitochondria in the light and the dark
Differential Expression of the Multigene Family Encoding the Soybean Mitochondrial Alternative Oxidase
The alternative oxidase (AOX) of the soybean (Glycine max L.) inner mitochondrial membrane is encoded by a multigene family (Aox) with three known members. Here, the Aox2 and Aox3 primary translation…
Alternative Oxidase Activity in Tobacco Leaf Mitochondria (Dependence on Tricarboxylic Acid Cycle-Mediated Redox Regulation and Pyruvate Activation)
- G. Vanlerberghe, D. Day, J. Wiskich, A. Vanlerberghe, L. Mcintosh
- BiologyPlant Physiology
- 1 October 1995
The authors' evidence suggests that NADPH may be specifically required for AOX reduction, and under conditions in which respiratory carbon metabolism is restricted by the capacity of mitochondrial electron transport, feed-forward activation of AOX by mitochondrial reducing power and pyruvate may act to prevent redirection of carbon metabolism, such as to fermentative pathways.
Organic acid activation of the alterNatlve oxidase of plant mitochondria
Regulation of alternative pathway activity in plant mitochondria: nonlinear relationship between electron flux and the redox poise of the quinone pool.
Regulation of alternative oxidase kinetics by pyruvate and intermolecular disulfide bond redox status in soybean seedling mitochondria
Cytochrome and alternative respiratory pathways compete for electrons in the presence of pyruvate in soybean mitochondria.
- M. Hoefnagel, A. Millar, J. Wiskich, D. Day
- Biology, Computer ScienceArchives of Biochemistry and Biophysics
- 20 April 1995
The results indicate that when the alternative oxidase is activated by pyruvate, it can compete for electrons with the cytochrome chain and does not act as an overflow pathway and the significance of these observations for in vivo respiration is discussed.
Regulation of nonphosphorylating electron transport pathways in soybean cotyledon mitochondria and its implications for fat metabolism.
It is suggested that these properties of soybean cotyledon mitochondria would enable succinate received from the glyoxysome during lipid metabolism to be rapidly oxidized, even under a high cytosolic energy charge.
Ubiquinone redox behavior in plant mitochondria during electron transport.
- M. Ribas-Carbó, J. Wiskich, J. Berry, J. Siedow
- BiologyArchives of Biochemistry and Biophysics
- 20 February 1995
The results indicate that ubiquinone can be a limiting component of electron transfer through the cyanide-resistant pathway, particularly in roots where its concentration is much lower than in cotyledons.
Specificity of the Organic Acid Activation of Alternative Oxidase in Plant Mitochondria
It is suggested that malate and succinate do not directly stimulate alternative oxidase, and that reports to the contrary reflect intra-mitochondrial generation of pyruvate via malic enzyme.