Allosteric regulation of the enzyme 3-deoxy-d-arabino-heptulosonate 7-phosphate synthase (DAH7PS) controls the entry into aromatic amino acid biosynthesis in plants and microorganisms. DAH7PS has acquired a diverse range of allosteric machinery to enable this functionality. This review provides an overview of the current knowledge of the structural basis of allostery in this enzyme family and the evolutionary relationships between the different solutions to allosteric control of aromatic metabolite biosynthesis.
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