Roland Cazalis

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Plants contain several genes encoding thioredoxin h. In cereals, type-h thioredoxins are abundant in developing and germinating grains, but the mechanism regulating the expression of these genes and their specific function is poorly known. The cloning of three full-length cDNAs encoding thioredoxin h, stated Trxh1, Trxh2 and Trxh3, from wheat (Triticum(More)
Chloroplastic thioredoxins f and m (TRX f and TRX m) mediate light regulation of carbon metabolism through the activation of Calvin cycle enzymes. The role of TRX f and m in the activation of Calvin cycle enzymes is best known among the TRX family. However, the discoveries of new potential targets extend the functions of chloroplastic TRXs to other(More)
In order to transform cytosolic fructose-1,6-bisphosphatases (FBPase)(EC 3.1.3.11) into potential reductively-modulated chloroplast-type enzymes, we have constructed four chimeric FBPases, which display structural viability as deduced by previous modelling. In the X1-type BV1 and HL1 chimera the N-half of cytosolic sugar beet (Beta vulgaris L.) and human(More)
Glutathione status and its relationship to molecular weight distribution (MWD) of wheat polymeric protein (PP) during the grain development have been examined. Changes in reduced glutathione (GSH), glutathione disulfide (GSSG), and protein-glutathione mixed disulfide (PSSG) levels were followed through reversed phase high performance liquid chromatography(More)
Cereal seed cells contain different mechanisms for protection against the oxidative stress that occurs during maturation and germination. One such mechanism is based on the antioxidant activity of a 1-Cys peroxiredoxin (1-Cys Prx) localized in the nuclei of aleurone and scutellum cells. However, nothing is known about the mechanism of activation of this(More)
Plants are the organisms containing the most complex multigenic family for thioredoxins (TRX). Several types of TRXs are targeted to chloroplasts, which have been classified into four subgroups: m, f, x, and y. Among them, TRXs f and m were the first plastidial TRXs characterized, and their function as redox modulators of enzymes involved in carbon(More)
Thioredoxins (TRXs) are small ubiquitous oxidoreductases involved in disulfide bond reduction of a large panel of target proteins. The most complex cluster in the family of plant TRXs is formed by h-type TRXs. In Arabidopsis (Arabidopsis thaliana), nine members of this subgroup were described, which are less well known than their plastidial counterparts.(More)
The individual is certainly the most complex entity that we know until now. Current research converges on a triad-like understanding of the biological individual as an interface of a mechanism and an ecosystem. The present article wants to propose a more generic concept of individual by integrating the functional role of its qualitative characteristics.(More)
We may be at the cusp of a next generation framework for science which can be facilitated by understanding current limitations in the context of a divergence of 'scientific' tradition from the Axial Age (800-200 BCE) to the present. A powerful advance may come from fusing certain elements from Western and Eastern traditions, synthesizing the framework with(More)
The phenomenologist Renaud Barbaras defends an alternative conception of life against the well-known proposals that view life as self-preserving or seeking to replicate its own means of replication in the form of repetition instead of creation or accomplishment as Barbaras proposes. Indeed, he criticizes the reductive nature of scientific inquiry which(More)