Bakken, Inger J. and Sonnewald, Ursula and Clark, John B. and Bates, Timothy E. (1997) [U-13C]glutamate metabolism in rat brain mitochondria reveals malic enzyme activity. Neuroreport, 8 (7). pp. 1567-1570. ISSN 0959-4965
Full text not available from this repository.Abstract
13C nuclear magnetic resonance spectroscopy was used to study the activity of malic enzyme in isolated brain mitochondria from rat in the presence of unlabelled malate and [U-13C]glutamate. ADP, inorganic phosphate, malate and [U-13C]glutamate were added to a suspension of oxygenated mitochondria. Typical tricarboxylic acid (TCA) cycle constituents (malate, 2-oxoglutarate and succinate) were labelled from [U-13C]glutamate and detected in the superfusion medium. The labelling patterns in the different atom positions of glutamate revealed entry of both unlabelled and labelled acetyl-CoA into the TCA cycle. Unlabelled acetyl-CoA was derived via pyruvate from exogenously applied malate by the action of mitochondrial malic enzyme, while labelled acetyl-CoA was derived from TCA cycle intermediates, most likely by the action of mitochondrial malic enzyme on malate produced from [U-13C]glutamate. The results demonstrate malic enzyme activity and pyruvate recycling in isolated rat brain mitochondria.
| Item Type: | Article |
|---|---|
| Additional Information: | 13C nuclear magnetic resonance spectroscopy was used to study the activity of malic enzyme in isolated brain mitochondria from rat in the presence of unlabelled malate and [U-13C]glutamate. ADP, inorganic phosphate, malate and [U-13C]glutamate were added to a suspension of oxygenated mitochondria. Typical tricarboxylic acid (TCA) cycle constituents (malate, 2-oxoglutarate and succinate) were labelled from [U-13C]glutamate and detected in the superfusion medium. The labelling patterns in the different atom positions of glutamate revealed entry of both unlabelled and labelled acetyl-CoA into the TCA cycle. Unlabelled acetyl-CoA was derived via pyruvate from exogenously applied malate by the action of mitochondrial malic enzyme, while labelled acetyl-CoA was derived from TCA cycle intermediates, most likely by the action of mitochondrial malic enzyme on malate produced from [U-13C]glutamate. The results demonstrate malic enzyme activity and pyruvate recycling in isolated rat brain mitochondria. |
| Keywords: | mitochondria, Brain, malic enzyme, 13C, NMR Spectroscopy |
| Subjects: | C Biological Sciences > C730 Metabolic Biochemistry A Medicine and Dentistry > A100 Pre-clinical Medicine B Subjects allied to Medicine > B140 Neuroscience |
| Divisions: | College of Sciences > Faculty of Science > School of Life Sciences |
| Depositing User: | Timothy Bates |
| Date Deposited: | 11 Jun 2012 09:54 |
| Last Modified: | 11 Jun 2012 09:54 |
| URI: | http://eprints.lincoln.ac.uk/id/eprint/5317 |
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