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Publication Abstract from PubMed

Dihydropteroate synthase (DHPS) is an enzyme of the folate biosynthesis pathway which catalyzes the formation of 7,8-dihydropteroate (DHPt) from 6-hydroxymethyl-7,8-dihydropterin pyrophosphate (DHPPP) and para-aminobenzoic acid (pABA). DHPS is the long-standing target of the sulfonamide class of antibiotics that compete with pABA. In the wake of sulfa drug resistance, targeting the structurally rigid (and more conserved) pterin site has been proposed as an alternate strategy to inhibit DHPS in wild-type and sulfa drug resistant strains. Following work developing pterin-site inhibitors of the adjacent enzyme 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK), we now present derivatives of 8-mercaptoguanine, a fragment that binds weakly within both enzymes, and quantify sub-muM binding using Surface Plasmon Resonance (SPR) to Escherichia coli DHPS (EcDHPS). Eleven ligand-bound EcDHPS crystal structures delineate the structure-activity relationship observed providing a structural framework for the rational development of novel, substrate envelope-compliant DHPS inhibitors.

8-Mercaptoguanine derivatives as inhibitors of dihydropteroate synthase.,Swarbrick J, Dennis M, Lee M, Harjani J, Ahmed M, Debono A, Pitcher N, Wang ZC, Chhabra S, Barlow N, Rahmani R, Cleary B, Dolezal O, Hattarki M, Aurelio L, Shonberg J, Graham B, Peat T, Baell J Chemistry. 2017 Nov 24. doi: 10.1002/chem.201704730. PMID:29171692^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.