Le Manach, C.Dam, J.Woodland, J.G.Kaur, G.Khonde, L.P.Brunschwig, C.Njoroge, M.Wicht, K.J.Horatscheck, A.Paquet, T.Boyle, G.A.Gibhard, L.Taylor, D.Lawrence, N.Yeo, T.Mok, S.Eastman, R.T.Dorjsuren, D.Talley, D.C.Guo, H.Simeonov, A.Reader, J.van der Watt, M.Erlank, E.Venter, N.Zawada, J.W.Aswat, A.Nardini, L.Coetzer, T.L.Lauterbach, S.B.Bezuidenhout, B.C.Theron, A.Mancama, D.Koekemoer, L.L.Birkholtz, L.Wittlin, S.Delves, M.Ottilie, S.Winzeler, E.A.von Geldern, T.W.Smith, D.Fidock, D.A.Street, L.J.Basarab, G.S.Duffy, J.Chibale, K.2024-03-222024-03-222021-02-12Le Manach C, Dam J, Woodland JG, Kaur G, Khonde LP, Brunschwig C, Njoroge M, Wicht KJ, Horatscheck A, Paquet T, Boyle GA, Gibhard L, Taylor D, Lawrence N, Yeo T, Mok S, Eastman RT, Dorjsuren D, Talley DC, Guo H, Simeonov A, Reader J, van der Watt M, Erlank E, Venter N, Zawada JW, Aswat A, Nardini L, Coetzer TL, Lauterbach SB, Bezuidenhout BC, Theron A, Mancama D, Koekemoer LL, Birkholtz LM, Wittlin S, Delves M, Ottilie S, Winzeler EA, von Geldern TW, Smith D, Fidock DA, Street LJ, Basarab GS, Duffy J, Chibale K. Identification and Profiling of a Novel Diazaspiro[3.4]octane Chemical Series Active against Multiple Stages of the Human Malaria Parasite Plasmodium falciparum and Optimization Efforts. J Med Chem. 2021 Feb 25;64(4):2291-2309. doi: 10.1021/acs.jmedchem.1c00034. Epub 2021 Feb 12.10.1021/acs.jmedchem.1c00034https://pubmed.ncbi.nlm.nih.gov/33573376/https://hdl.handle.net/11288/595614A novel diazaspiro[3.4]octane series was identified from a Plasmodium falciparum whole-cell high-throughput screening campaign. Hits displayed activity against multiple stages of the parasite lifecycle, which together with a novel sp3-rich scaffold provided an attractive starting point for a hit-to-lead medicinal chemistry optimization and biological profiling program. Structure-activity-relationship studies led to the identification of compounds that showed low nanomolar asexual blood-stage activity (<50 nM) together with strong gametocyte sterilizing properties that translated to transmission-blocking activity in the standard membrane feeding assay. Mechanistic studies through resistance selection with one of the analogues followed by whole-genome sequencing implicated the P. falciparum cyclic amine resistance locus in the mode of resistance.enAttribution 3.0 United Stateshttp://creativecommons.org/licenses/by/3.0/us/AnimalsGerm cellsMolecular structureStructure-activity relationshipSDG-03 Good health and well-beingArticleJournal of Medicinal Chemistry