Prof. Dr. med. Bernd K. Fleischmann
Institut für Physiologie 1
bernd.fleischmann@uni-bonn.de View member: Prof. Dr. med. Bernd K. Fleischmann
Chemistry (Weinheim an der Bergstrasse, Germany)
The 5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine derivative BIM-46174 and its dimeric form BIM-46187 (1) are heterocyclized dipeptides that belong to the very few cell-permeable compounds known to preferentially silence Gα proteins. To explore the chemical space of Gα inhibitors of the BIM chemotype, a combinatorial approach was conducted towards a library of BIM molecules. This library was evaluated in a second messenger-based fluorescence assay to analyze the activity of Gα proteins through the determination of intracellular myo-inositol 1-phosphate. Structure-activity relationships were deduced and structural requirements for biological activity obtained, which were (i) a redox reactive thiol/disulfane substructure, (ii) an N-terminal basic amino group, (iii) a cyclohexylalanine moiety, and (iv) a bicyclic skeleton. Active compounds exhibited cellular toxicity, which was investigated in detail for the prototypical inhibitor 1. This compound affects the structural cytoskeletal dynamics in a Gα -independent manner.
© 2020 The Authors. Published by Wiley-VCH GmbH.
PMID: 32428383