2. Academic Validation
  3. 8-Mercaptoguanine Derivatives as Inhibitors of Dihydropteroate Synthase

8-Mercaptoguanine Derivatives as Inhibitors of Dihydropteroate Synthase

  • Chemistry. 2018 Feb 6;24(8):1922-1930. doi: 10.1002/chem.201704730.
Matthew L Dennis 1 2,  Michael D Lee 1 2,  Jitendra R Harjani 1,  Mohamed Ahmed 1 3,  Aaron J DeBono 1,  Noel P Pitcher 1,  Zhong-Chang Wang 1 4,  Sandeep Chhabra 1,  Nicholas Barlow 1,  Raphaël Rahmani 1,  Ben Cleary 1,  Olan Dolezal 2,  Meghan Hattarki 2,  Luigi Aurelio 1,  Jeremy Shonberg 1,  Bim Graham 1,  Thomas S Peat 2,  Jonathan B Baell 1 5,  James D Swarbrick 1
Affiliations

Affiliations

  • 1 Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, 3052, Victoria, Australia.
  • 2 CSIRO Biomedical Program, Manufacturing, Parkville, 3052, Victoria, Australia.
  • 3 School of Pharmacy, University College London, Bloomsbury, London, WC1N 1AX, UK.
  • 4 State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, 210093, P. R. China.
  • 5 School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, 211816, P. R. China.
PMID: 29171692 DOI: 10.1002/chem.201704730
Abstract

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 the work on 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-μm 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.

Keywords

DHPS; antibiotics; drug discovery; inhibitors; pterin; substrate-envelope hypothesis.

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