Figure 1.

Schematic representation of the metabolic pathway of the riboflavin biosynthesis. Gene names are following the nomenclature of the Saccharomyces Genome Database (SGD). RIB1: GTP cyclohydrolase II, RIB7: 2,5-Diamino-6-ribosylamino-4-(3H)-pyrimidinone-5'-phosphate reductase, RIB2: 2,5-Diamino-6-ribitylamino-4-(3H)-pyrimidinone-5'-phosphate deaminase, RIB3: 3,4-dihydroxy-2-butanone-4-phosphate synthase, RIB4: 6,7-dimethyl-8-ribityllumazine synthase, RIB5: riboflavine synthetase