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Genes yiaP and yiaR of the yiaKLMNOPQRS cluster of Escherichia coli are required for the metabolism of the endogenously formed L-xylulose, whereas yiaS is required for this metabolism only in araD mutants. Like AraD, YiaS was shown to have L-ribulose-5-phosphate 4-epimerase activity. Similarity of YiaR to several 3-epimerases suggested that this protein(More)
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