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  Thioredoxin-mediated regulation of (photo)respiration and central metabolism

da Fonseca-Pereira, P., Souza, P. V. L., Fernie, A. R., Timm, S., Daloso, D. M., & Araújo, W. L. (2021). Thioredoxin-mediated regulation of (photo)respiration and central metabolism. Journal of Experimental Botany, 72(17), 5987-6002. doi:10.1093/jxb/erab098.

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da Fonseca-Pereira, Paula1, Author
Souza, Paulo V L1, Author
Fernie, A. R.2, Author              
Timm, Stefan1, Author
Daloso, Danilo M1, Author
Araújo, Wagner L1, Author
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1External Organizations, ou_persistent22              
2Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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 Abstract: Thioredoxins (TRXs) are ubiquitous proteins engaged in the redox regulation of plant metabolism. Whilst the light-dependent TRX-mediated activation of Calvin-Benson cycle enzymes is well-documented, the role of extraplastidial TRXs in the control of the mitochondrial (photo)respiratory metabolism has been revealed relatively recently. Mitochondrially located TRX o1 has been identified as regulator of alternative oxidase, enzymes of, or associated to, the tricarboxylic acid (TCA) cycle and the mitochondrial dihydrolipoamide dehydrogenase (mtLPD) involved in photorespiration, the TCA cycle and the degradation of branched chain amino acids. TRXs are seemingly a major point of metabolic regulation responsible to activate photosynthesis and adjust mitochondrial photorespiratory metabolism according to the prevailing cellular redox status. Furthermore, TRX-mediated (de)activation of TCA cycle enzymes contributes to explain the non-cyclic flux mode of operation of this cycle in illuminated leaves. Here we provide an overview on the decisive role of TRXs in the coordination of mitochondrial metabolism in the light and provide in silico evidence for other redox-regulated photorespiratory enzymes. We further discuss the consequences of mtLPD regulation beyond photorespiration and provide outstanding questions that should be addressed in future studies to improve our understanding concerning the role of TRXs in the regulation of central metabolism.

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Language(s): eng - English
 Dates: 2021-02-21
 Publication Status: Published in print
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 Identifiers: DOI: 10.1093/jxb/erab098
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Title: Journal of Experimental Botany
  Other : J. Exp. Bot
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press [etc.]
Pages: - Volume / Issue: 72 (17) Sequence Number: - Start / End Page: 5987 - 6002 Identifier: ISSN: 0022-0957
CoNE: https://pure.mpg.de/cone/journals/resource/954925413883