M-type thioredoxins are involved in the xanthophyll cycle and proton motive force to alter NPQ under low-light conditions in Arabidopsis

Plant Cell Reports
Qingen DaBing Liu

Abstract

M-type thioredoxins are required to regulate zeaxanthin epoxidase activity and to maintain the steady-state level of the proton motive force, thereby influencing NPQ properties under low-light conditions in Arabidopsis. Non-photochemical quenching (NPQ) helps protect photosynthetic organisms from photooxidative damage via the non-radiative dissipation of energy as heat. Energy-dependent quenching (qE) is a major constituent of NPQ. However, the mechanism underlying the regulation of qE is not well understood. In this study, we demonstrate that the m-type thioredoxins TRX-m1, TRX-m2, and TRX-m4 (TRX-ms) interact with the xanthophyll cycle enzyme zeaxanthin epoxidase (ZE) and are required for maintaining the redox-dependent stabilization of ZE by regulating its intermolecular disulfide bridges. Reduced ZE activity and accumulated zeaxanthin levels were observed under TRX-ms deficiency. Furthermore, concurrent deficiency of TRX-ms resulted in a significant increase in proton motive force (pmf) and acidification of the thylakoid lumen under low irradiance, perhaps due to the significantly reduced ATP synthase activity under TRX-ms deficiency. The increased pmf, combined with acidification of the thylakoid lumen and the accumulation...Continue Reading

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Citations

Aug 11, 2020·The Plant Journal : for Cell and Molecular Biology·Manuel Guinea DiazEevi Rintamäki
Jun 28, 2019·Plant Direct·Lauri NikkanenEevi Rintamäki
Apr 17, 2019·The Biochemical Journal·Lauri Nikkanen, Eevi Rintamäki
Feb 6, 2021·International Journal of Molecular Sciences·Fiaz RasulBernd Mueller-Roeber
Mar 6, 2021·Frontiers in Plant Science·Ryota MuraiKen Motohashi
Apr 2, 2021·Plant Physiology·Patrick WillemsJingjing Huang
May 9, 2021·Journal of Experimental Botany·María AncínInmaculada Farran
Jul 22, 2021·The Plant Journal : for Cell and Molecular Biology·Antonio J SerratoMariam Sahrawy

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Methods Mentioned

BETA
reversed phase chromatography
transgenic
reverse-transcription PCR
confocal microscopy
pull-down
chemical treatments

Software Mentioned

Tanon Gis

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