A novel extended family of stromal thioredoxins
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Thioredoxins play key regulatory roles in chloroplasts by linking photosynthetic light reactions to a series of plastid functions. In addition to the established groups of thioredoxins, f, m, x, and y, novel plant thioredoxins were also considered to include WCRKC motif proteins, CDSP32, the APR proteins, the lilium proteins and HCF164. Despite their important roles, the subcellular locations of many novel thioredoxins has remained unknown. Here, we report a study of their subcellular location using the cDNA clone resources of TAIR. In addition to filling all gaps in the subcellular map of the established chloroplast thioredoxins f, m, x and y, we show that the members of the WCRKC family are targeted to the stroma and provide evidence for a stromal location of the lilium proteins. The combined data from this and related studies indicate a consistent stromal location of the known Arabidopsis chloroplast thioredoxins except for thylakoid-bound HCF164.
KeywordsArabidopsis thaliana Chloroplast Protein targeting Subcellular location Thioredoxin
This study was supported by grants from the J. C. Kempe Memorial Fund Foundation (M. H.), the Carl-Trygger Foundation (T. K.) and the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS, to W. P. S).
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