4paw is a 2 chain structure with sequence from Atcc 43504. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
[PYRE_HELPY] Catalyzes the transfer of a ribosyl phosphate group from 5-phosphoribose 1-diphosphate to orotate, leading to the formation of orotidine monophosphate (OMP).