You can find more information about dihydrofolate synthase/folylpolyglutamate synthase using the following links:

Affecting Drugs
Drug Name	PubMed Articles (year of publication)
Cycloguanil	dCTP levels are maintained in Plasmodium falciparum subjected to pyrimidine deficiency or excess(1997) A bifunctional dihydrofolate synthetase--folylpolyglutamate synthetase in Plasmodium falciparum identified by functional complementation in yeast and bacteria(2001)
Phosphinate	Characterisation of the bifunctional dihydrofolate synthase-folylpolyglutamate synthase from Plasmodium falciparum; a potential novel target for antimalarial antifolate inhibition(2010)
Proguanil	A bifunctional dihydrofolate synthetase--folylpolyglutamate synthetase in Plasmodium falciparum identified by functional complementation in yeast and bacteria(2001)
Pyrimethamine	A bifunctional dihydrofolate synthetase--folylpolyglutamate synthetase in Plasmodium falciparum identified by functional complementation in yeast and bacteria(2001)
Sulfadoxine	A bifunctional dihydrofolate synthetase--folylpolyglutamate synthetase in Plasmodium falciparum identified by functional complementation in yeast and bacteria(2001)
Wr99210	dCTP levels are maintained in Plasmodium falciparum subjected to pyrimidine deficiency or excess(1997)