were introduced, and systematic fluorine, bromine, and phenyl scans for phenylalanine in the P2 position were performed. Moreover, the N-terminal protection was varied. Kinetic investigations were carried out with cathepsin L, S, and K as well as papain. Changes in the backbone structure of the parent N-(tert-butoxycarbonyl)-phenylalanyl-glycine-nitrile (16), such as the introduction of an R-configured
Optimization of dipeptidic inhibitors of cathepsin L for improved Toxoplasma gondii selectivity and CNS permeability
作者:Jeffery D. Zwicker、Nicolas A. Diaz、Alfredo J. Guerra、Paul D. Kirchhoff、Bo Wen、Duxin Sun、Vern B. Carruthers、Scott D. Larsen
DOI:10.1016/j.bmcl.2018.03.020
日期:2018.6
cathepsin L. Starting from a known inhibitor of human cathepsin L, and guided by structure-based design, we were able to modulate the selectivity for Toxoplasma vs human CPL by nearly 50-fold while modifying physiochemical properties to be more favorable for metabolic stability and CNS penetrance. The overall potency of our inhibitors towards TgCPL was improved from 2 μM to as low as 110 nM and we successfully
Cathepsin S inhibitors having formula (I), (II), (III) or (IV) as shown in the specification. These inhibitors can be used to treat cancer and autoimmune/inflammatory diseases.
Using the example of cathepsin K, we demonstrate the design of highly potent and selective azadipeptide nitrite inhibitors A systematic scan with respect to P2 and P3 substituents was carried out Structural modifications strongly affected the enzyme-inhibitor association (but not dissociation) rate A combination of optimized P2 and P3 substituents with a methylation of the P3-P2 amide linker resulted in the picomolar cathepsin K inhibitor 19 with remarkable selectivity over cathepsins L, B, and S
Influence of azide incorporation on binding affinity by small papain inhibitors
作者:Angelique E.M. Wammes、Tom G. Hendriks、Helene I.V. Amatdjais-Groenen、Marloes A. Wijdeven、Jan C.M. van Hest、Floris L. van Delft、Tina Ritschel、Floris P.J.T. Rutjes
DOI:10.1016/j.bmc.2014.06.001
日期:2014.10
In order to develop affinity-based biosensor platforms, appropriate ligands with a functional handle for immobilization onto a biosensor surface are required. To this end, a library of papain inhibitors was designed and synthesized, containing different azide linkers for subsequent immobilization by 'click' chemistry, in this particular case by copper-free, strain-promoted azide-alkyne cycloaddition (SPAAC). Furthermore, a molecular docking study was performed to obtain a better insight as to at which position such azide handles could be tolerated without affecting binding affinity. Although the azide moiety is small, in some cases its introduction strongly influenced the binding affinity. For one class of inhibitors a swapped binding mode was proposed to explain the results. In addition, a specific site for linker introduction was identified, which did not significantly affect the binding affinity. (C) 2014 Elsevier Ltd. All rights reserved.