By Sir Daniel Hall
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Additional resources for The genus tulipa
1995). The physiological significance of the weak bin ding of GSTs to auxins and cytokinins remains to be defined, though it is perhaps significant that GSTUs are frequently induced by these hormones, or by the physiological conditions that favour their accumulation, such as during cell division (Marrs 1996). The most compelling evidence that GSTs play roles in ligand bin ding in planta have come from defining the biochemical basis of the bronze 11 (bz2) mutation in maize, which maps to a tau dass GST gene (Marrs et al.
Similarly, yeast Ure2, a prion protein with structural similarity to GSTs, is involved in the regulation of nitrogen metabolism (Bousset et al. 2001). GSTs can also influence signalling in a less direct way, by influeneing levels of its substrates and their products; a number of such compounds are known to modulate gene expression. For example, mouse GSTA4-4 efficiently metabolises lipid peroxides, which have roles as signalling molecules (Singh et al. 2002). Similarly, GSH is important in maintaining the redox state of cells, and any perturbation of redox status, due to excess ROS formation, for exampIe, initiates signalling events to induce antioxidant protective systems (Noctor and Foyer 1998).
In another model the parent safeners are recognised by a receptor protein. In support of this, structure activity studies with dichloroacetamide safeners in maize have demonstrated that these compounds interact with specific receptors (Walton and Casida 1995), and subsequently a safener binding protein (Saf BP) was isolated and cloned (Scott-Craig et al. 1998). The SafBP protein resembled an 0methyltransferase in sequence, though no functional catalytic or signalling activity was reported. 40 R.
The genus tulipa by Sir Daniel Hall