Potent Inhibitors of Plasmodial Serine Hydroxymethyltransferase (SHMT) Featuring a Spirocyclic ScaffoldSchwertz, G., Witschel, M.C., Rottmann, M., Leartsakulpanich, U., Chitnumsub, P., Jaruwat, A., Amornwatcharapong, W., Ittarat, W., Schafer, A., Aponte, R.A., Trapp, N., Chaiyen, P., Diederich, F.
(2018) ChemMedChem 13: 931-943
- PubMed: 29655285
- DOI: 10.1002/cmdc.201800053
- Primary Citation of Related Structures:
- PubMed Abstract:
With the discovery that serine hydroxymethyltransferase (SHMT) is a druggable target for antimalarials, the aim of this study was to design novel inhibitors of this key enzyme in the folate biosynthesis cycle. Herein, 19 novel spirocyclic ligands bas ...
With the discovery that serine hydroxymethyltransferase (SHMT) is a druggable target for antimalarials, the aim of this study was to design novel inhibitors of this key enzyme in the folate biosynthesis cycle. Herein, 19 novel spirocyclic ligands based on either 2-indolinone or dihydroindene scaffolds and featuring a pyrazolopyran core are reported. Strong target affinities for Plasmodium falciparum (Pf) SHMT (14-76 nm) and cellular potencies in the low nanomolar range (165-334 nm) were measured together with interesting selectivity against human cytosolic SHMT1 (hSHMT1). Four co-crystal structures with Plasmodium vivax (Pv) SHMT solved at 2.2-2.4 Å resolution revealed the key role of the vinylogous cyanamide for anchoring ligands within the active site. The spirocyclic motif in the molecules enforces the pyrazolopyran core to adopt a substantially more curved conformation than that of previous non-spirocyclic analogues. Finally, solvation of the spirocyclic lactam ring of the receptor-bound ligands is discussed.
National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Phahonyothin Road, Pathumthani, 12120, Thailand.,Department of Biochemistry and Center for Excellence in Protein and Enzyme Technology, Faculty of Science, Mahidol University, 272 Rama VI Road, Bangkok, 10400, Thailand.,Department of Biomolecular Science and Engineering, School of Biomolecular Science & Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan Valley, Rayong, 21210, Thailand.,BASF SE, Carl-Bosch-Strasse 38, 67056, Ludwigshafen, Germany.,Swiss Tropical and Public Health Institute (SwissTPH), Socinstrasse 57, 4051, Basel, Switzerland.,Universität Basel, Petersplatz 1, 4003, Basel, Switzerland.,Laboratorium für Organische Chemie, ETH Zürich, Vladimir-Prelog-Weg 3, 8093, Zürich, Switzerland.