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• W4328103246 startingPage "101861" @default.
• W4328103246 abstract "A novel deuterium-excited and proton-detected quadruple-resonance three-dimensional (3D) 2HαcαNH MAS nuclear magnetic resonance (NMR) method is presented to obtain site-specific 2Hα deuterium quadrupolar couplings from protein backbone, as an extension to the 2D version of the experiment reported earlier. Proton-detection results in high sensitivity compared to the heteronuclei detection methods. Utilizing four independent radiofrequency (RF) channels (quadruple-resonance), we managed to excite the 2Hα, then transfer deuterium polarization to its attached Cα, followed by polarization transfers to the neighboring backbone nitrogen and then to the amide proton for detection. This experiment results in an easy to interpret HSQC-like 2D 1H-15N fingerprint NMR spectrum, which contains site-specific deuterium quadrupolar patterns in the indirect third dimension. Provided that four-channel NMR probe technology is available, the setup of the 2HαcαNH experiment is relatively straightforward, by using low power deuterium excitation and polarization transfer schemes we have been developing. To our knowledge, this is the first demonstration of a quadruple-resonance MAS NMR experiment to link 2Hα quadrupolar couplings to proton-detection, extending our previous triple-resonance demonstrations. Distortion-free excitation and polarization transfer of ∼160-170 kHz 2Hα quadrupolar coupling were presented by using a deuterium RF strength of ∼20 kHz. From these 2Hα patterns, an average backbone order parameter of S = 0.92 was determined on a deuterated SH3 sample, with an average η = 0.22. These indicate that SH3 backbone represents sizable dynamics in the microsecond timescale where the 2Hα lineshape is sensitive. Moreover, site-specific 2Hα T1 relaxation times were obtained for a proof of concept. This 3D 2HαcαNH NMR experiment has the potential to determine structure and dynamics of perdeuterated proteins by utilizing deuterium as a novel reporter." @default.
• W4328103246 created "2023-03-22" @default.
• W4328103246 creator A5017241340 @default.
• W4328103246 date "2023-06-01" @default.
• W4328103246 modified "2023-09-30" @default.
• W4328103246 title "Site-specific protein backbone deuterium 2Hα quadrupolar patterns by proton-detected quadruple-resonance 3D 2HαcαNH MAS NMR spectroscopy" @default.
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• W4328103246 doi "https://doi.org/10.1016/j.ssnmr.2023.101861" @default.
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