Site directed nitroxide spin labeling of oligonucleotides for NMR and EPR studies
摘要:
Nitroxide labels are useful probes of biomolecule structure that can be detected by NMR and EPR spectroscopy. Although many methods exist for labeling oligonucleotides with nitroxides, most require reagents that are expensive or laborious to prepare. A simpler approach is described herein using commercially available phosphorothioate oligonucleotides and 2-(3-iodoacetamidomethyl)-PROXYL. We describe semi-optimized conditions for labeling DNA and RNA oligonucleotides and methodology for purifying and identifying these reagents by MALDI-MS. The nitroxide label showed some propensity to hydrolyze at high temperature and over prolonged periods at room temperature. Nitroxide-labeled DNA oligonucleotides gave characteristic EPR spectra and caused the disappearance of bound protein signals in N-15 HSQC spectra consistent with the paramagnetic relaxation enhancement (PRE) effect. (C) 2015 The Authors. Published by Elsevier Ltd.
[EN] NITROXIDE CONTAINING AMYLOID BINDING AGENTS FOR IMAGING AND THERAPEUTIC USES<br/>[FR] AGENTS DE LIAISON À L'AMYLOÏDE CONTENANT DU NITROXYDE UTILISÉS EN IMAGERIE ET À DES FINS THÉRAPEUTIQUES
申请人:UNIV CALIFORNIA
公开号:WO2017031239A1
公开(公告)日:2017-02-23
The present invention provides methods of using nitroxide spin-labeled amyloid beta-binding compounds to image amyloid. The present invention also provides nitroxide spin-labeled amyloid beta-binding compounds