Side-Chain-Anchored Nα-Fmoc-Tyr-OPfp for Bidirectional Solid-Phase Synthesis
摘要:
A mild resin-immobilization strategy employing a readily prepared trityl bromide resin for anchoring building blocks via a phenol group has been developed. With N-alpha-Fmoc-Tyr-OPfp as a starter building block, it was possible to prepare asymmetrically substituted hybrids of spider and wasp-type polyamine toxins using solid-phase peptide synthesis conditions.
Assessment of Structurally Diverse Philanthotoxin Analogues for Inhibitory Activity on Ionotropic Glutamate Receptor Subtypes: Discovery of Nanomolar, Nonselective, and Use-Dependent Antagonists
作者:Sidsel Frølund、Angelo Bella、Anders S. Kristensen、Hanne L. Ziegler、Matthias Witt、Christian A. Olsen、Kristian Strømgaard、Henrik Franzyk、Jerzy W. Jaroszewski
DOI:10.1021/jm100886h
日期:2010.10.28
The analogues were studied using two-electrode voltage-clamp electrophysiology employing Xenopus laevis oocytes expressing GluA1i AMPA or GluN1/2A NMDAreceptors. Several of the analogues showed significantly increased inhibition of the GluN1/2A NMDAreceptor. Thus, an analogue containing N-(1-naphtyl)acetyl group showed an IC50 value of 47 nM. For the diamino acid-based analogues, the optimal spacer
Solid-phase synthesis of neuroactive spider–wasp hybrid toxin analogues using a backbone amide linker
作者:Christian A. Olsen、Matthias Witt、Henrik Franzyk、Jerzy W. Jaroszewski
DOI:10.1016/j.tetlet.2006.11.074
日期:2007.1
Polyamine toxins isolated from the venoms of spiders and wasps and their synthetic analogues are uncompetitive antagonists of ligand-gated ionotropic receptors in the central- and peripheral nervous systems, and have proved valuable as tools for the investigation of receptor structure and function. In the present letter we describe the efficient solid-phase synthesis (SPS) of novel hybrid toxins using
A protocol for parallel solid-phase synthesis of Ï-amino acid-elongated philanthotoxins was developed for exploration of structure-activity relationships for unnatural wasp toxin analogues. Several methods for on-resin activation of N-trityl-linked Ï-amino acids were investigated, and the influence of chain length upon activation as pentafluorophenyl (Pfp) esters was examined. Comparison of Pfp-ester activation with phosphonium- and aminium/uronium-promoted coupling without pre-activation of the resin-bound carboxylic acids showed that only benzotriazol-1-yloxytris(pyrrolidino)phosphonium hexafluorophosphate (PyBOP) exhibited a comparable efficiency. The present Pfp ester protocol gave high yields and purities of the resulting philanthotoxin analogues; however, in the case of γ-aminobutyric acid (GABA), use of PyBOP was required in order to avoid lactamization to 2-pyrrolidone.
Side-Chain-Anchored <i>N</i><sup>α</sup>-Fmoc-Tyr-OPfp for Bidirectional Solid-Phase Synthesis
作者:Christian A. Olsen、Malene R. Jørgensen、Steen H. Hansen、Matthias Witt、Jerzy W. Jaroszewski、Henrik Franzyk
DOI:10.1021/ol050305o
日期:2005.4.1
A mild resin-immobilization strategy employing a readily prepared trityl bromide resin for anchoring building blocks via a phenol group has been developed. With N-alpha-Fmoc-Tyr-OPfp as a starter building block, it was possible to prepare asymmetrically substituted hybrids of spider and wasp-type polyamine toxins using solid-phase peptide synthesis conditions.