These redundant systems of propionyl-CoA synthesis are needed because the prpE gene is part of the prpBCDE operon under the control of the PrpR regulatory protein .
the PrpR regulatory protein controls the expression of the prpBCDE operon
the PrpR regulatory protein controls the expression of the prpBCDE operon
PrpR protein bound to the DNA region between the prpBCDE operon and prpR .