Dihydropteroate synthase: purification by affinity chromatography and mechanism of action

Abstract
The purification of dihydropteroate synthase by affinity chromatography on a sulphonamide bound to agarose is described. The discovery that binding to the affinity column occurs only in the presence of the co-substrate, the pteridine diphosphate (2), or the corresponding monophosphate (3), is discussed in relation to an ordered kinetic mechanism of action of the enzyme.