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Discovery of New E‐Selectin Inhibitors by Virtual Screening, Fluorescence Binding Assays, and STD NMR Experiments
Author(s) -
Barra Pabla A.,
Jiménez Verónica A.,
Gavin José A.,
Daranas Antonio H.,
Alderete Joel B.
Publication year - 2016
Publication title -
chemmedchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.817
H-Index - 100
eISSN - 1860-7187
pISSN - 1860-7179
DOI - 10.1002/cmdc.201600058
Subject(s) - virtual screening , dissociation constant , chemistry , protein data bank (rcsb pdb) , biophysics , drug discovery , biochemistry , stereochemistry , biology , receptor
E‐selectin is an endothelial protein that participates in the adhesion of metastatic cancer cells, and is therefore a relevant target for antitumor therapeutic intervention. In this work, virtual screening was used to identify new E‐selectin inhibitors from a subset of drug‐like molecules retrieved from the ZINC database, including the physiological ligand sLe x as reference structure (PDB ID: 1G1T). Four hits were chosen and subjected to molecular dynamics simulations and fluorescence binding assays, which led to the determination of experimental dissociation constants between 333 and 1012 μ m . The candidate with the highest affinity was studied by saturation transfer difference (STD) NMR experiments and complete relaxation and conformational exchange matrix analysis of saturation transfer (CORCEMA‐ST), aimed at identifying the preferable binding mode with E‐selectin. Our results revealed that this new inhibitor binds more strongly than sLe x in the E‐selectin binding site, in good agreement with simulation predictions. These properties will prove valuable for the future design of drugs that target E‐selectin.