作者:Angelica M. Bello、Lianhu Wei、Beata Majchrzak-Kita、Noruê Salum、Meena K. Purohit、Eleanor N. Fish、Lakshmi P. Kotra
DOI:10.1016/j.bmc.2013.12.049
日期:2014.2
Small molecules that mimic IFN-alpha epitopes that interact with the cell surface receptor, IFNAR, would be useful therapeutics. One such 8-amino acid region in IFN-alpha 2, designated IRRP-1, was used to derive 11 chemical compounds that belong to 5 distinct chemotypes, containing the molecular features represented by the key residues Leu30, Arg33, and Asp35 in IRRP-1. Three of these compounds exhibited potential mimicry to IRRP-1 and, in cell based assays, as predicted, effectively inhibited IFNAR activation by IFN-alpha. Of these, compound 3 did not display cell toxicity and reduced IFN-alpha-inducible STAT1 phosphorylation and STAT-DNA binding. Based on physicochemical properties' analyses, our data suggest that moieties with acidic pKa on the small molecule may be a necessary element for mimicking the carboxyl group of Asp35 in IRRP-1. Our data confirm the relevance of this strategy of molecular mimicry of ligand-receptor interaction domains of protein partners for small molecule drug discovery. (C) 2014 Elsevier Ltd. All rights reserved.