NADPH Thioredoxin Reductase C and Thioredoxins Act Concertedly in Seedling Development

Plant Physiology
Valle OjedaFrancisco Javier Cejudo

Abstract

Thiol-dependent redox regulation of enzyme activity plays a central role in the rapid acclimation of chloroplast metabolism to ever-fluctuating light availability. This regulatory mechanism relies on ferredoxin reduced by the photosynthetic electron transport chain, which fuels reducing power to thioredoxins (Trxs) via a ferredoxin-dependent Trx reductase. In addition, chloroplasts harbor an NADPH-dependent Trx reductase, which has a joint Trx domain at the carboxyl terminus, termed NTRC. Thus, a relevant issue concerning chloroplast function is to establish the relationship between these two redox systems and its impact on plant development. To address this issue, we generated Arabidopsis (Arabidopsis thaliana) mutants combining the deficiency of NTRC with those of Trxs f, which participate in metabolic redox regulation, and that of Trx x, which has antioxidant function. The ntrc-trxf1f2 and, to a lower extent, ntrc-trxx mutants showed severe growth-retarded phenotypes, decreased photosynthesis performance, and almost abolished light-dependent reduction of fructose-1,6-bisphosphatase. Moreover, the combined deficiency of both redox systems provokes aberrant chloroplast ultrastructure. Remarkably, both the ntrc-trxf1f2 and ntrc...Continue Reading

Citations

Oct 29, 2017·Proceedings of the National Academy of Sciences of the United States of America·Juan Manuel Pérez-RuizFrancisco Javier Cejudo
Dec 1, 2018·Antioxidants & Redox Signaling·Mirko ZaffagniniPaolo Trost
Jul 12, 2019·Journal of Experimental Botany·Maricruz GonzálezFrancisco Javier Cejudo
Aug 11, 2020·The Plant Journal : for Cell and Molecular Biology·Manuel Guinea DiazEevi Rintamäki
Apr 26, 2019·Frontiers in Plant Science·Francisco Javier CejudoJuan Manuel Pérez-Ruiz
Oct 10, 2018·Frontiers in Plant Science·Katsiaryna SkryhanAndreas Blennow
Oct 20, 2020·Frontiers in Plant Science·María Carmen MartíFrancisca Sevilla
Dec 29, 2020·The Plant Journal : for Cell and Molecular Biology·Tatjana KleineDario Leister
Apr 2, 2021·Plant Physiology·Francisco Javier CejudoJuan Manuel Pérez-Ruiz
May 8, 2021·Journal of Experimental Botany·Fernando Domínguez, Francisco Javier Cejudo
Jul 3, 2021·Antioxidants·Belen NaranjoDario Leister
Jul 22, 2021·The Plant Journal : for Cell and Molecular Biology·Antonio J SerratoMariam Sahrawy
Aug 24, 2021·Frontiers in Plant Science·M Luisa Hernández, Francisco Javier Cejudo

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