Nanomolar E-Selectin Antagonists with Prolonged Half-Lives by a Fragment-Based Approach
摘要:
Selectins, a family of C-type lectins, play a key role in inflammatory diseases (e.g., asthma and arthritis). However, the only millimolar affinity of sialyl Lewis(x) (sLe(x)), which is the common tetrasaccharide epitope of all physiological selectin ligands, has been a major obstacle to the development of selectin antagonists for therapeutic applications. In a fragment-based approach guided by NMR, ligands binding to a second site in close proximity to a sLe(x) mimic were identified. A library of antagonists obtained by connecting the sLe(x) mimic to the best second-site ligand via triazole linkers of different lengths was evaluated by surface plasmon resonance. Detailed analysis of the five most promising candidates revealed antagonists with K-D values ranging from 30 to 89 nM. In contrast to carbohydratelectin complexes with typical half-lives (t(1/2)) in the range of one second or even less, these fragment-based selectin antagonists show t(1/2) of several minutes. They exhibit a promising starting point for the development of novel anti-inflammatory drugs.
A Fragment-Based In Situ Combinatorial Approach To Identify High-Affinity Ligands for Unknown Binding Sites
作者:Sachin V. Shelke、Brian Cutting、Xiaohua Jiang、Hendrik Koliwer-Brandl、Daniel S. Strasser、Oliver Schwardt、Soerge Kelm、Beat Ernst
DOI:10.1002/anie.200907254
日期:——
the lead: The title method for the identification of ligands is particularly useful for bindingsites where little or no structural information is available. In a fragment‐based approach, a suitable pair of first‐ and second‐siteligands is identified by NMR experiments. By applying a receptor‐mediated in situcombinatorialapproach, the two ligands are then linked to generate a new high‐affinity lead