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Mitochondrial complex II is traditionally studied for its participation in two key respiratory processes: the electron transport chain and the Krebs cycle. There is now a rich body of literature explaining how complex II contributes to respiration. However, more recent research shows that not all of the pathologies associated with altered complex II activity clearly correlate with this respiratory role. Complex II activity has now been shown to be necessary for a range of biological processes peripherally related to respiration, including metabolic control, inflammation, and cell fate. Integration of findings from multiple types of studies suggests that complex II both participates in respiration and controls multiple succinate-dependent signal transduction pathways. Thus, the emerging view is that the true biological function of complex II is well beyond respiration. This review uses a semichronological approach to highlight major paradigm shifts that occurred over time. Special emphasis is given to the more recently identified functions of complex II and its subunits because these findings have infused new directions into an established field. Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.

Citation

T M Iverson, Prashant K Singh, Gary Cecchini. An evolving view of complex II-noncanonical complexes, megacomplexes, respiration, signaling, and beyond. The Journal of biological chemistry. 2023 Jun;299(6):104761

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PMID: 37119852

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