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Arsenite provides a selective signal that coordinates arsenate uptake and detoxification through the regulation of PHR1 stability in Arabidopsis

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Molecular Plant 2021年第9期14卷 1489-1507页

作者： Cristina Navarro Cristian Mateo-Elizalde Thotegowdanapalya C.Mohan Eduardo Sanchez-Bermejo Oscar Urrutia Maria Nieves Fernandez-Muniz Jose M.Garcia-Mina Riansares Munoz Javier Paz-Ares Gabriel Castrillo Antonio Leyva Department of Plant Molecular Genetics Centro Nacional de Biotecnología-Consejo Superior de Investigaciones CientíficasMadrid 28049Spain Department of Environmental Biology Sciences SchoolUniversity of NavarraPamplona 31008Spain Department of Analytical Chemistry School of Chemical SciencesUniversidad Complutense de MadridMadrid 28040Spain Present address:Department of Biotechnology and Bioinformatics Faculty of Life SciencesJSS Academy of Higher Education and ResearchMysuruKarnataka 570015India Present address:S&A Fresh Produce.Brook Farm MardenHereford HR13ETUK Future Food Beacon of Excellence&School of Biosciences University of NottinghamNottingham LE125RDUK

In nature,plants acquire nutrients from soils to sustain growth,and at the same time,they need to avoid the uptake of toxic compounds and/or possess tolerance systems to cope with them.This is particularly challenging when the toxic compound and the nutrient are chemically similar,as in the case of phosphate and arsenate.In this study,we demonstrated that regulatory elements of the phosphate starvation response(PSR)coordinate the arsenate detoxification machinery in the cell.We showed that arsenate repression of the phosphate transporter PHT1;1 is associated with the degradation of the PSR master regulator PHR1.Once arsenic is sequestered into the vacuole,PHR1 stability is restored and PHT1;1 expression is recovered.Furthermore,we identified an arsenite responsive SKP1-like protein and a PHR1 interactor F-box(PHIF1)as constituents of the SCF complex responsible for PHR1 degradation.We found that arsenite,the form to which arsenate is reduced for compartmentalization in vacuoles,represses PHT1;1 expression,providing a highly selective signal versus phosphate to control PHT1;1 expression in response to arsenate.Collectively,our results provide molecular insights into a sensing mechanism that regulates arsenate/phosphate uptake depending on the plant’s detoxification capacity.

关键词： arsenic signaling F-box protein arsenate uptake arsenic detoxification phosphate starvation phytoremediation

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