Cited by 420Mitochondrial Function and PathologyEnzyme Structure and FunctionCoenzyme Q10 studies and effects

Understanding mitochondrial complex I assembly in health and disease

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Mimaki, Masakazu, Wang, Xiaonan, McKenzie, Matthew, Thorburn, David R., Ryan, Michael T.·2012·Biochimica et Biophysica Acta (BBA) - Bioenergetics

Abstract

Complex I (NADH:ubiquinone oxidoreductase) is the largest multimeric enzyme complex of the mitochondrial respiratory chain, which is responsible for electron transport and the generation of a proton gradient across the mitochondrial inner membrane to drive ATP production. Eukaryotic complex I consists of 14 conserved subunits, which are homologous to the bacterial subunits, and more than 26 accessory subunits. In mammals, complex I consists of 45 subunits, which must be assembled correctly to form the properly functioning mature complex. Complex I dysfunction is the most common oxidative phosphorylation (OXPHOS) disorder in humans and defects in the complex I assembly process are often observed. This assembly process has been difficult to characterize because of its large size, the lack of a high resolution structure for complex I, and its dual control by nuclear and mitochondrial DNA. However, in recent years, some of the atomic structure of the complex has been resolved and new insights into complex I assembly have been generated. Furthermore, a number of proteins have been identified as assembly factors for complex I biogenesis and many patients carrying mutations in genes associated with complex I deficiency and mitochondrial diseases have been discovered. Here, we review the current knowledge of the eukaryotic complex I assembly process and new insights from the identification of novel assembly factors. This article is part of a Special Issue entitled: Biogenesis/Assembly of Respiratory Enzyme Complexes.

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  • Proper ETC component assembly relies on coordinated activity between nuclear and mitochondrial encoded subunit genes.

    “Proper ETC component assembly relies on coordinated activity between nuclear and mitochondrial encoded subunit genes.81”

    From Uncovering the signatures of aging and senescence in the human dorsolateral prefrontal cortex (2026) · cites this paper as [81]

    Section 2, “Complex I assembly” (page unavailable), says nuclear-DNA-encoded subunits must assemble in coordination with mitochondrial-DNA-encoded subunits to form a functioning complex I. Complex I is an ETC component, but the paper does not establish this requirement for ETC components generally. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Variants in NDUFAF1 and ACAD9 are associated with complex I deficiency in humans.

    “Variants in both assembly factors are associated with complex I deficiency in humans.39”
  • NDUFAF1-targeted RNAi decreased NDUFAF1 protein amounts by 80% and lowered complex I activity while leaving complex II amount unaffected.

    “We selectively knocked down expression of the complex I assembly factor NDUFAF1 (ref. 36) by RNAi, which decreased protein amounts by 80% (Supplementary Fig. 16a–c) and lowered complex I activity (Supplementary Fig. 16d) while leaving the amount of complex II unaffected (Supplementary Fig. 16a,e).”

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Authors
Mimaki, M., Wang, X., McKenzie, M., Thorburn, D. R., & Ryan, M. T.
Affiliations
  • La Trobe University (AU)
  • Monash Institute of Medical Research (AU)
  • Royal Children's Hospital (AU)
Corresponding author
Ryan, Michael T.
Venue
Biochimica et Biophysica Acta (BBA) - Bioenergetics
Publisher
Elsevier BV
Published
2012-06
Volume
1817
Issue
6
Pages
851-862
ISSN
0005-2728 (ISSN-L)
OpenAlex
W2016680661
Cited by
420
References
145
Citations by year
2026: 12 · 2025: 25 · 2024: 36 · 2023: 21 · 2022: 28 · 2021: 40 · 2020: 32 · 2019: 27 · 2018: 43 · 2017: 25 · 2016: 43 · 2015: 35 · 2014: 17 · 2013: 21 · 2012: 15
FWCI
1.54
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - Bioenergetics (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by-nc-nd)
Funders
  • Australian Research Council
  • Australian National Health and Medical Research Council (NHMRC)
  • Victorian Government's Operational Infrastructure Support Program
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
Keywords
mitochondrial complex I, complex I, complex I assembly, assembly factors, mitochondrial respiratory chain, oxidative phosphorylation disorders, mitochondrial disease, complex I deficiency, electron transport, ATP production
MeSH terms
Animals, Humans, Mitochondria, NADH Dehydrogenase, Oxidative Phosphorylation, Protein Structure, Quaternary, Protein Subunits, Mitochondrial Proteins, Mitochondrial Diseases, Electron Transport Complex I, Acyl-CoA Dehydrogenases, Protein Multimerization

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