Abstract
α-Ketoglutarate dehydrogenase (α-KGDH), a key enzyme in the Krebs' cycle, is a crucial early target of oxidative stress (Tretter and Adam-Vizi, 2000). The present study demonstrates that α-KGDH is able to generate H2O2and, thus, could also be a source of reactive oxygen species (ROS) in mitochondria. Isolated α-KGDH with coenzyme A (HS-CoA) and thiamine pyrophosphate started to produce H2O2after addition of α-ketoglutarate in the absence of nicotinamide adenine dinucleotide-oxidized (NAD+). NAD+, which proved to be a powerful inhibitor of α-KGDH-mediated H2O2formation, switched the H2O2forming mode of the enzyme to the catalytic [nicotinamide adenine dinucleotide-reduced (NADH) forming] mode. In contrast, NADH stimulated H2O2formation by α-KGDH, and for this, neither α-ketoglutarate nor HS-CoA were required. When all of the substrates and cofactors of the enzyme were present, the NADH/NAD+ratio determined the rate of H2O2production. The higher the NADH/NAD+ratio the higher the rate of H2O2production. H2O2production as well as the catalytic function of the enzyme was activated by Ca2+. In synaptosomes, using α-ketoglutarate as respiratory substrate, the rate of H2O2production increased by 2.5-fold, and aconitase activity decreased, indicating that α-KGDH can generate H2O2inin situmitochondria. Given the NADH/NAD+ratio as a key regulator of H2O2production by α-KGDH, it is suggested that production of ROS could be significant not only in the respiratory chain but also in the Krebs' cycle when oxidation of NADH is impaired. Thus α-KGDH is not only a target of ROS but could significantly contribute to generation of oxidative stress in the mitochondria.
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Dates
Type | When |
---|---|
Created | 20 years, 11 months ago (Sept. 8, 2004, 3:13 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 14, 2024, 4:35 a.m.) |
Indexed | 6 days, 23 hours ago (Aug. 24, 2025, 7:02 p.m.) |
Issued | 20 years, 11 months ago (Sept. 8, 2004) |
Published | 20 years, 11 months ago (Sept. 8, 2004) |
Published Online | 20 years, 11 months ago (Sept. 8, 2004) |
Published Print | 20 years, 11 months ago (Sept. 8, 2004) |
@article{Tretter_2004, title={Generation of Reactive Oxygen Species in the Reaction Catalyzed by α-Ketoglutarate Dehydrogenase}, volume={24}, ISSN={1529-2401}, url={http://dx.doi.org/10.1523/jneurosci.1842-04.2004}, DOI={10.1523/jneurosci.1842-04.2004}, number={36}, journal={The Journal of Neuroscience}, publisher={Society for Neuroscience}, author={Tretter, Laszlo and Adam-Vizi, Vera}, year={2004}, month=sep, pages={7771–7778} }