Structure-based design of α-amido aldehyde containing gluten peptide analogues as modulators of HLA-DQ2 and transglutaminase 2
作者:Matthew Siegel、Jiang Xia、Chaitan Khosla
DOI:10.1016/j.bmc.2007.06.020
日期:2007.9
Complete, life-long exclusion of gluten containing foods from the diet is the only available treatment for celiac sprue, a widespread immune disease of the small intestine. Investigations into the molecular pathogenesis of celiac sprue have identified the major histocompatibility complex protein HLA-DQ2 and the multi-functional enzyme transglutaminase 2 as potential pharmacological targets. Based upon the crystal structure of HLA-DQ2, we rationally designed an aldehyde-functionalized, gluten peptide analogue as a tight-binding HLA-DQ2 ligand. Aldehyde-bearing gluten peptide analogues were also designed as high-affinity, reversible inhibitors of transglutaminase 2. By varying the side-chain length of the aldehyde-functionalized amino acid, we found that the optimal transglutaininase 2 inhibitor was 5 methylene units in length, 2 carbon atoms longer than its natural glutamine substrate. (c) 2007 Elsevier Ltd. All rights reserved.