Swm_01432 K00762 pyrE R01870Orotidine 5'-phosphate + Diphosphate <=> Orotate + 5-Phospho-alpha-D-ribose 1-diphosphate
orotidine-5'-phosphate:diphosphate phospho-alpha-D-ribosyl-transferase Swm_01433 K01591 pyrF R00965Orotidine 5'-phosphate <=> UMP + CO2
orotidine-5'-phosphate carboxy-lyase (UMP-forming) Swm_01434 K17828 pyrDI R01869(S)-Dihydroorotate + NAD+ <=> Orotate + H+ + NADH
(S)-dihydroorotate:NAD+ oxidoreductase