Saccharides as Prospective Immobilizers of Nucleic Acids for Room-Temperature Structural EPR Studies.
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.
N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Andrey A
AA
Kuzhelev
Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Georgiy Yu
GY
Shevelev
International Tomography Center SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Olesya A
OA
Krumkacheva
N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Victor M
VM
Tormyshev
Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Dmitrii V
DV
Pyshnyi
International Tomography Center SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Matvey V
MV
Fedin
N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Novosibirsk 630090, Russia.|Novosibirsk State University , Novosibirsk 630090, Russia.
Elena G
EG
Bagryanskaya