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Chloroplast f and m Thioredoxins Discovered in Nonphotosynthetic Tissues
Date:10/16/2007

in the nucleus. The f and m types were isolated from chloroplasts and function there in light-regulated reactions related to photosynthesis. h-type TRXs are localized in the cytosol and are thought to function in seeds in maturation and germination, in plant reproduction, and in other signaling pathways. Thioredoxin h is also thought to be a mobile element in plants transported through the phloem or directly from cell to cell through plasmodesmata and thus may act as a messenger molecule in signaling. Several other types of TRXs have also been found in plants.

The scientists identified regions in the control sequences of the two TRX genes, which specify whether the genes will be regulated by light, where they will be expressed, and the metabolic pathway in which they may function. Different metabolic pathways that were identified as TRX regulated include embryo and seed formation, protein storage, the circadian clock, pollen localization, and hormonal regulation.

Dr.Sahrawy and her collaborators Juan de Dios Barajas-Lopez, Antonio Jesus Serrato, Adela Olmedilla and Ana Chueca found that the f and m type TRX genes were expressed in early development of seedlings and in stems, leaves, roots, and flowers, and identified potential new functions in cell division, germination, and plant reproduction. Whereas the light regulated expression of these genes in the chloroplast is well known, the discovery by Sahrawy and her team that their expression in nonphotosynthetic tissues is also regulated by light, albeit indirectly, is a new and potentially far reaching insight into the regulation of plant metabolism. In addition, their finding that f and m TRXs occur in the vascular tissues of both leaves and roots, suggests that these TRX types may function as messengers or in the regulation of transporter molecules. The proteins were also found in pea seeds and in the ovules and pollen grains of flowers in regions of active cell division, where the f
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Contact: Beatrice Grabowski
bgrabowski@earthlink.net
American Society of Plant Biologists
Source:Eurekalert

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