Cited by 86Mitochondrial Function and PathologyMetabolism and Genetic DisordersEnzyme Structure and Function

Cytopathies involving mitochondrial complex II

Ackrell, Brian A.C·2002·Molecular Aspects of Medicine

Abstract

Complex II (succinate-ubiquinone oxidoreductase) is the smallest complex in the respiratory chain and contains four nuclear-encoded subunits SdhA, SdhB, SdhC, and SdhD. It functions both as a respiratory chain component and an essential enzyme of the TCA cycle. Electrons derived from succinate can thus be directly transferred to the ubiquinone pool. Major insights into the workings of complex II have been provided by crystal structures of closely related bacterial enzymes, which have also been genetically manipulated to answer questions of structure-function not approachable using the mammalian system. This information, together with that accrued over the years on bovine complex II and by recent advances in understanding in vivo synthesis of the non-heme iron co-factors of the enzyme, is allowing better recognition of improper functioning of human complex II in diseased states. The discussion in this review is thus limited to cytopathies arising because the enzyme itself is defective or depleted by lack of iron-sulfur clusters. There is a clear dichotomy of effects. Enzyme depletion and mutations in SDHA compromise TCA activity and energy production, whereas mutations in SDHB, SDHC, and SDHD induce paraganglioma. SDHC and SDHD are the first tumor suppressor genes of mitochondrial proteins.

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Crossref · 10.1016/s0098-2997(02)00012-2

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  • Mutations in complex II subunits C and D near the Qp site are associated with hereditary paragangliomas and pheochromocytomas, and SdhA mutations can cause Leigh syndrome.

    “This seems to be especially the case for mutations in complex II subunits C and D located in the vicinity of the Qp site that have been associated with specific forms of cancer such as hereditary paragangliomas and pheochromocytomas (overview in [13,14,36]) and in SdhA that can cause Leigh syndrome, a progressive neurodegenerative disease [14,94].”

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Authors
Ackrell, B. A. C.
Affiliations
San Francisco VA Medical Center (US)
Corresponding author
Ackrell, Brian A.C
Venue
Molecular Aspects of Medicine
Publisher
Elsevier BV
Published
2002-10
Volume
23
Issue
5
Pages
369-384
ISSN
0098-2997 (ISSN-L)
OpenAlex
W1968604357
Cited by
86
References
90
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 3 · 2022: 1 · 2021: 6 · 2020: 2 · 2019: 5 · 2018: 1 · 2017: 1 · 2016: 6 · 2014: 2 · 2013: 4 · 2012: 3
FWCI
0.53
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Aspects of Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • National Institutes of Health (5p01hl016251-25)
  • National Heart, Lung, and Blood Institute (HL 16251)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
succinate dehydrogenase, succinate-ubiquinone oxidoreductase, SDHA, SDHB, SDHC, SDHD, TCA cycle, iron-sulfur clusters, paraganglioma, tumor suppressor, electron transport chain, succinate dehydrogenase mutations, energy production
MeSH terms
Animals, Humans, Multienzyme Complexes, Mutation, Oxidoreductases, Succinate Dehydrogenase, Electron Transport Complex II

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