Efficient Solution Phase Synthesis of PPII Helix Mimicking Ena/VASP EVH1 Inhibitors from Proline-Derived Modules (ProMs) |
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Authors: | Dr Dominik Albat Dr Slim Chiha Dr Stephan Dohmen Pascal M Engelhardt Dr Hanna Sebode Dr Arne Soicke Dr Matthias Barone Dr Matthias Müller Dr Ronald Kühne Prof Dr Hans-Günther Schmalz |
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Institution: | 1. University of Cologne, Department of Chemistry, Greinstraße 4, 50939 Cologne, Germany;2. Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Straße 10, 13125 Berlin, Germany |
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Abstract: | In the search for efficient inhibitors for the enabled/vasodilator-stimulated phosphoprotein homology 1 (EVH1) domain to reduce cell motility in metastatic cancer, we previously developed a toolkit of proline-derived modules (ProMs), which mimic the PPII helix found in the natural −FPPPP− binding motif of EVH1. In this work, we describe the modular assembly of these ProM-based pentapeptidic EVH1 ligands through liquid phase peptide synthesis. We initially used pentafluorophenyl (Pfp) active esters for amide bond formation and built up the growing peptide chain from the C- to the N-terminus. Switching to HATU/DIPEA coupling conditions and changing the directionality of the synthesis from the N- to the C-terminus afforded the target ligands with improved overall yields and purity. Employing a Fmoc-protected (instead of the N-acetylated) phenylalanine derivative as N-terminal building block significantly reduced epimerization. In contrast to the originally used solid phase peptide synthesis (SPPS), the developed solution phase method allowed for a facile alteration of the C-terminal ProM unit and the production of various pentapeptidic ligands in an efficient fashion even on a multigram scale. |
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Keywords: | coupling reagents PPII helix mimetics liquid phase peptide synthesis proline protecting groups |
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