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The mitochondrial thioredoxin system
Department of Biosciences at Novum, Center for Biotechnology, Karolinska Institutet, Huddinge, Sweden.
Department of Biosciences at Novum, Center for Biotechnology, Karolinska Institutet, Huddinge, Sweden.
Department of Biosciences at Novum, Center for Biotechnology, Karolinska Institutet, Huddinge, Sweden.
2000 (English)In: Antioxidants and Redox Signaling, ISSN 1523-0864, E-ISSN 1557-7716, Vol. 2, no 4, 801-810 p.Article in journal (Refereed) Published
Abstract [en]

Eukaryotic organisms from yeast to human possess a mitochondrial thioredoxin system composed of thioredoxin and thioredoxin reductase, similar to the cytosolic thioredoxin system that exists in the same cells. Yeast and mammalian mitochondrial thioredoxins are monomers of approximately 12 kDa and contain the typical conserved active site WCGPC. However, there are important differences between yeast and mammalian mitochondrial thioredoxin reductases that resemble the differences between their cytosolic counterparts. Mammalian mitochondrial thioredoxin reductase is a selenoprotein that forms a homodimer of 55 kDa/subunit; while yeast mitochondrial thioredoxin reductase is a homodimer of 37 kDa/subunit and does not contain selenocysteine. A function of the mitochondrial thioredoxin system is as electron donor for a mitochondrial peroxiredoxin, an enzyme that detoxifies the hydrogen peroxide generated by the mitochondrial metabolism. Experiments with yeast mutants lacking both the mitochondrial thioredoxin system as well as the mitochondrial peroxiredoxin system suggest an important role for mitochondrial thioredoxin, thioredoxin reductase, and peroxiredoxin in the protection against oxidative stress.

Place, publisher, year, edition, pages
Mary Ann Liebert, 2000. Vol. 2, no 4, 801-810 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-98820DOI: 10.1089/ars.2000.2.4-801PubMedID: 11213484OAI: oai:DiVA.org:liu-98820DiVA: diva2:655961
Available from: 2013-10-14 Created: 2013-10-14 Last updated: 2017-12-06Bibliographically approved

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Spyrou, Giannis

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