- 2H-1,2,3-Triazole-Based Dipeptidyl Nitriles: Potent, Selective, and Trypanocidal Rhodesain Inhibitors by Structure-Based Design
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Macrocyclic inhibitors of rhodesain (RD), a parasitic cysteine protease and drug target for the treatment of human African trypanosomiasis, have shown low metabolic stability at the macrocyclic ether bridge. A series of acyclic dipeptidyl nitriles was developed using structure-based design (PDB ID: 6EX8). The selectivity against the closely related cysteine protease human cathepsin L (hCatL) was substantially improved, up to 507-fold. In the S2 pocket, 3,4-dichlorophenylalanine residues provided high trypanocidal activities. In the S3 pocket, aromatic residues provided enhanced selectivity against hCatL. RD inhibition (Ki values) and in vitro cell-growth of Trypanosoma brucei rhodesiense (IC50 values) were measured in the nanomolar range. Triazole-based ligands, obtained by a safe, gram-scale flow production of ethyl 1H-1,2,3-triazole-4-carboxylate, showed excellent metabolic stability in human liver microsomes and in vivo half-lives of up to 1.53 h in mice. When orally administered to infected mice, parasitaemia was reduced but without complete removal of the parasites.
- Giroud, Maude,Kuhn, Bernd,Saint-Auret, Sarah,Kuratli, Christoph,Martin, Rainer E.,Schuler, Franz,Diederich, Fran?ois,Kaiser, Marcel,Brun, Reto,Schirmeister, Tanja,Haap, Wolfgang
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p. 3370 - 3388
(2018/05/01)
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- Discovery of pyrrolopyrimidine inhibitors of Akt
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The discovery and optimization of a series of pyrrolopyrimidine based protein kinase B (Pkb/Akt) inhibitors discovered via HTS and structure based drug design is reported. The compounds demonstrate potent inhibition of all three Akt isoforms and knockdown of phospho-PRAS40 levels in LNCaP cells and tumor xenografts.
- Blake, James F.,Kallan, Nicholas C.,Xiao, Dengming,Xu, Rui,Bencsik, Josef R.,Skelton, Nicholas J.,Spencer, Keith L.,Mitchell, Ian S.,Woessner, Richard D.,Gloor, Susan L.,Risom, Tyler,Gross, Stefan D.,Martinson, Matthew,Morales, Tony H.,Vigers, Guy P.A.,Brandhuber, Barbara J.
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scheme or table
p. 5607 - 5612
(2010/11/17)
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