Abstract:
:Rhodesain (RD) is a parasitic, human cathepsin L (hCatL) like cysteine protease produced by Trypanosoma brucei ( T. b.) species and a potential drug target for the treatment of human African trypanosomiasis (HAT). A library of hCatL inhibitors was screened, and macrocyclic lactams were identified as potent RD inhibitors ( Ki < 10 nM), preventing the cell-growth of Trypanosoma brucei rhodesiense (IC50 < 400 nM). SARs addressing the S2 and S3 pockets of RD were established. Three cocrystal structures with RD revealed a noncovalent binding mode of this ligand class due to oxidation of the catalytic Cys25 to a sulfenic acid (Cys-SOH) during crystallization. The P-glycoprotein efflux ratio was measured and the in vivo brain penetration in rats determined. When tested in vivo in acute HAT model, the compounds permitted up to 16.25 (vs 13.0 for untreated controls) mean days of survival.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Giroud M,Dietzel U,Anselm L,Banner D,Kuglstatter A,Benz J,Blanc JB,Gaufreteau D,Liu H,Lin X,Stich A,Kuhn B,Schuler F,Kaiser M,Brun R,Schirmeister T,Kisker C,Diederich F,Haap Wdoi
10.1021/acs.jmedchem.7b01869subject
Has Abstractpub_date
2018-04-26 00:00:00pages
3350-3369issue
8eissn
0022-2623issn
1520-4804journal_volume
61pub_type
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