the following results provided additional evidence to support the view that all three phosphoribosyltransferase activities may be catalyzed by the same enzyme : ( a ) the apparent km for 5-phosphoribosyl 1-pyrophosphate ( pp-ribose-p ) did not change significantly when enzyme activity was measured with either 5-fluorouracil , uracil , or orotate ;
C0016360
fluorouracil
C0041917
uracil