DHPS subgroup of Pterin binding enzymes. DHPS (dihydropteroate synthase), a functional homodimer, catalyzes the condensation of p-aminobenzoic acid (pABA) in the de novo biosynthesis of folate, which is an essential cofactor in both nucleic acid and protein biosynthesis. Prokaryotes (and some lower eukaryotes) must synthesize folate de novo, while higher eukaryotes are able to utilize dietary folate and therefore lack DHPS. Sulfonamide drugs, which are substrate analogs of pABA, target DHPS.
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