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Riboflavin synthase catalyzes the disproportionation of 6,7-dimethyl-8-ribityllumazine affording riboflavin and 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione. We have determined the structure of riboflavin synthase from Schizosaccharomyces pombe in complex with the substrate analog, 6-carboxyethyl-7-oxo-8-ribityllumazine at 2.1 A resolution. In contrast to the homotrimeric solution state of native...
The lumazine synthase/riboflavin synthase ofBacillus subtilisis a bifunctional enzyme complex catalysing the formation of riboflavin from 5-amino-6-(d-ribitylamino)-2,4(1H,3H)-pyrimidinedione andl-3,4-dihydroxy-2-butanone-4-phosphatevia6,7-dimethyl-8-ribityllumazine. The complex is composed of 3α (riboflavin synthase) subunits and 60 β (lumazine synthase) subunits and has a relative mass of 1 MDa...
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