Arnold 2023 J Biol Chem: Difference between revisions

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{{Publication
{{Publication
|title=Arnold PK, Finley LWS (2022) Regulation and function of the mammalian tricarboxylic acid cycle. J Biol Chem 299:102838. doi: 10.1016/j.jbc.2022.102838
|title=Arnold PK, Finley LWS (2023) Regulation and function of the mammalian tricarboxylic acid cycle. J Biol Chem 299:102838. https://doi.org/10.1016/j.jbc.2022.102838
|info=[https://pubmed.ncbi.nlm.nih.gov/36581208/ PMID: 36581208 Open Access]
|info=[https://pubmed.ncbi.nlm.nih.gov/36581208/ PMID: 36581208 Open Access]
|authors=Arnold PK, Finley LWS
|authors=Arnold PK, Finley LWS
|year=2022
|year=2023
|journal=J Biol Chem
|journal=J Biol Chem
|abstract=The tricarboxylic acid (TCA) cycle, otherwise known as the Krebs cycle, is a central metabolic pathway that performs the essential function of oxidizing nutrients to support cellular bioenergetics. More recently, it has become evident that TCA cycle behavior is dynamic, and products of the TCA cycle can be co-opted in cancer and other pathologic states. In this review, we revisit the TCA cycle, including its potential origins and the history of its discovery. We provide a detailed accounting of the requirements for sustained TCA cycle function and the critical regulatory nodes that can stimulate or constrain TCA cycle activity. We also discuss recent advances in our understanding of the flexibility of TCA cycle wiring and the increasingly appreciated heterogeneity in TCA cycle activity exhibited by mammalian cells. Deeper insight into how the TCA cycle can be differentially regulated and, consequently, configured in different contexts will shed light on how this pathway is primed to meet the requirements of distinct mammalian cell states.
|abstract=The tricarboxylic acid (TCA) cycle, otherwise known as the Krebs cycle, is a central metabolic pathway that performs the essential function of oxidizing nutrients to support cellular bioenergetics. More recently, it has become evident that TCA cycle behavior is dynamic, and products of the TCA cycle can be co-opted in cancer and other pathologic states. In this review, we revisit the TCA cycle, including its potential origins and the history of its discovery. We provide a detailed accounting of the requirements for sustained TCA cycle function and the critical regulatory nodes that can stimulate or constrain TCA cycle activity. We also discuss recent advances in our understanding of the flexibility of TCA cycle wiring and the increasingly appreciated heterogeneity in TCA cycle activity exhibited by mammalian cells. Deeper insight into how the TCA cycle can be differentially regulated and, consequently, configured in different contexts will shed light on how this pathway is primed to meet the requirements of distinct mammalian cell states.
|editor=Gnaiger E
|editor=Gnaiger E
}}
}}
== Correction: FADH<sub>2</sub> and S-pathway ==
[[File:Arnold, Finley 2022 CORRECTION.png|right|400px]]
::::* [[Complex II ambiguities]]
{{Template:Correction FADH2 and S-pathway}}
Β 
{{Labeling
:::: [[File:Arnold, Finley 2022 CORRECTION.png|800px]]
|enzymes=Complex II;succinate dehydrogenase
Β 
}}
:::: A commonly found error on FADH<sub>2</sub> in the S-pathway requires correction. For clarification, see page 48 in [[Gnaiger_2020_BEC_MitoPathways |Gnaiger (2020)]]
::::* Quote (p 48): "TheΒ  substrateΒ  ofΒ  CIIΒ  isΒ  succinate,Β  whichΒ  isΒ  oxidizedΒ  formingΒ  fumarateΒ  while reducing flavin adenine dinucleotide FAD to FADH<sub>2</sub>, with further electron transfer to the quinone pool. Whereas reduced NADH is a substrate of Complex I linked to dehydrogenases of the TCA cycle and mt-matrix upstream of CI,Β  reducedΒ  FADH<sub>2</sub> is a product of Complex II with downstream electron flow from CII to Q."
Β 
:::::: Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2. https://doi.org/10.26124/bec:2020-0002
<br>

Latest revision as of 21:54, 28 August 2023

Publications in the MiPMap
Arnold PK, Finley LWS (2023) Regulation and function of the mammalian tricarboxylic acid cycle. J Biol Chem 299:102838. https://doi.org/10.1016/j.jbc.2022.102838

Β» PMID: 36581208 Open Access

Arnold PK, Finley LWS (2023) J Biol Chem

Abstract: The tricarboxylic acid (TCA) cycle, otherwise known as the Krebs cycle, is a central metabolic pathway that performs the essential function of oxidizing nutrients to support cellular bioenergetics. More recently, it has become evident that TCA cycle behavior is dynamic, and products of the TCA cycle can be co-opted in cancer and other pathologic states. In this review, we revisit the TCA cycle, including its potential origins and the history of its discovery. We provide a detailed accounting of the requirements for sustained TCA cycle function and the critical regulatory nodes that can stimulate or constrain TCA cycle activity. We also discuss recent advances in our understanding of the flexibility of TCA cycle wiring and the increasingly appreciated heterogeneity in TCA cycle activity exhibited by mammalian cells. Deeper insight into how the TCA cycle can be differentially regulated and, consequently, configured in different contexts will shed light on how this pathway is primed to meet the requirements of distinct mammalian cell states.

β€’ Bioblast editor: Gnaiger E

Arnold, Finley 2022 CORRECTION.png

Correction: FADH2 and Complex II

Ambiguity alert.png
FADH2 is shown as the substrate feeding electrons into Complex II (CII). This is wrong and requires correction - for details see Gnaiger (2024).
Gnaiger E (2024) Complex II ambiguities ― FADH2 in the electron transfer system. J Biol Chem 300:105470. https://doi.org/10.1016/j.jbc.2023.105470 - Β»Bioblast linkΒ«

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Enzyme: Complex II;succinate dehydrogenase 




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