Reduction Resistant and Rigid Nitroxide Spin-Labels for DNA and RNA
作者:Haraldur Y. Juliusson、Snorri Th. Sigurdsson
DOI:10.1021/acs.joc.9b02988
日期:2020.3.20
paramagnetic resonance (EPR) spectroscopy, coupled with site-directed spinlabeling (SDSL), is a useful method for studying conformational changes of biomolecules in cells. To employ in-cell EPR using nitroxide-based spinlabels, the structure of the nitroxides must confer reduction resistance to withstand the reductive environment within cells. Here, we report the synthesis of two new spinlabels, EÇ and EÇm
Synthesis and Characterization of RNA Containing a Rigid and Nonperturbing Cytidine-Derived Spin Label
作者:Claudia Höbartner、Giuseppe Sicoli、Falk Wachowius、Dnyaneshwar B. Gophane、Snorri Th. Sigurdsson
DOI:10.1021/jo301227w
日期:2012.9.7
The nitroxide-containing nucleoside Cm is reported as the first rigid spin label for paramagnetic modification of RNA by solid-phase synthesis. The spin label is well accommodated in several RNA secondary structures as judged by its minor effect on the thermodynamic stability of hairpin and duplex RNA. Electron paramagnetic resonance (EPR) spectroscopic characterization of mono-, bi-, and trimolecular RNA structures shows that Cm will be applicable for advanced EPR studies to elucidate structural and dynamic aspects of folded RNA.