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• W2958675692 abstract "Abstract Arabidopsis thaliana contains the putative K + efflux transporters KEA1-KEA6, similar to KefB and KefC of Escherichia coli . KEA1-KEA3 are involved in the regulation of photosynthetic electron transport and chloroplast development. KEA4-KEA6 mediate pH regulation of the endomembrane network during salinity stress. However, the ion transport activities of KEA1-KEA6 have not been directly characterized. In this study, we used an E . coli expression system to examine KEA activity. KEA1-KEA3 and KEA5 showed bi-directional K + transport activity, whereas KEA4 and KEA6 functioned as a K + uptake system. The thylakoid membrane-localized Na + /H + antiporter NhaS3 from the model cyanobacterium Synechocystis is the closest homolog of KEA3. Changing the putative Na + /H + selective site of KEA3 (Gln-Asp) to that of NhaS3 (Asp-Asp) did not alter the ion selectivity without loss of K + transport activity. The first residue in the conserved motif was not a determinant for K + or Na + selectivity. Deletion of the possible nucleotide-binding KTN domain from KEA3 lowered K + transport activity, indicating that the KTN domain was important for this function. The KEA3-G422R mutation discovered in the Arabidopsis dpgr mutant increased K + transport activity, consistent with the mutant phenotype. These results indicate that Arabidopsis KEA1-KEA6 act as K + transport systems, and support the interpretation that KEA3 promotes dissipation of ΔpH in the thylakoid membrane." @default.
• W2958675692 created "2019-07-23" @default.
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• W2958675692 date "2019-07-11" @default.
• W2958675692 modified "2023-09-30" @default.
• W2958675692 title "Evidence for potassium transport activity of Arabidopsis KEA1-KEA6" @default.
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• W2958675692 doi "https://doi.org/10.1038/s41598-019-46463-7" @default.
• W2958675692 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6624313" @default.
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