Abstract: Pulsed dipolar electron paramagnetic resonance (EPR) spectroscopy is a powerful tool for structural studies of biomolecules and their complexes. This method, whose applicability has been recently extended to room temperatures, requires immobilization of the studied biosystem to prevent averaging of dipolar couplings; at the same time, the modification of native conformations by immobilization must be avoided. In this work, we provide first demonstration of room-temperature EPR distance measurements in nucleic acids using saccharides trehalose, sucrose, and glucose as immobilizing media. We propose an approach that keeps structural conformation and unity of immobilized double-stranded DNA. Remarkably, room-temperature electron spin dephasing time of triarylmethyl-labeled DNA in trehalose is noticeably longer compared to previously used immobilizers, thus providing a broader range of available distances. Therefore, saccharides, and especially trehalose, can be efficiently used as immobilizers of nucleic acids, mimicking native conditions and allowing wide range of structural EPR studies at room temperatures.

Cite: Kuzhelev A.A. , Shevelev G.Y. , Krumkacheva O.A. , Tormyshev V.M. , Pyshnyi D.V. , Fedin M.V. , Bagryanskaya E.G.
Saccharides as Prospective Immobilizers of Nucleic Acids for Room-Temperature Structural EPR Studies
The Journal of Physical Chemistry Letters. 2016. V.7. N13. P.2544-2548. DOI: 10.1021/acs.jpclett.6b01024 WOS Scopus РИНЦ

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Dates:

Published online:	Jun 22, 2016
Published print:	Jul 7, 2016

Identifiers:

Web of science	WOS:000379457400043
Scopus	2-s2.0-84978148913
Elibrary	27016596
OpenAlex	W2426989173

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