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- W2017665087 abstract "One of the main applications of solid-state NMR is to study the structure and dynamics of biopolymers, such as membrane proteins, under physiological conditions where the polypeptides undergo global motions as they do in biological membranes. The effects of NMR radiofrequency irradiations on nuclear spins are strongly influenced by these motions. For example, we previously showed that the MSHOT-Pi4 pulse sequence yields spectra with resonance line widths about half of those observed using the conventional pulse sequence when applied to membrane proteins undergoing rapid uniaxial rotational diffusion in phospholipid bilayers. In contrast, the line widths were not changed in microcrystalline samples where the molecules did not undergo global motions. Here, we demonstrate experimentally and describe analytically how some Hamiltonian terms are susceptible to sample motions, and it is their removal through the critical π/2 Z-rotational symmetry that confers the motion adapted property to the MSHOT-Pi4 pulse sequence. This leads to the design of separated local field pulse sequence Motion-adapted SAMPI4 and is generalized to an approach for the design of decoupling sequences whose performance is superior in the presence of molecular motions. It works by cancelling the spin interaction by explicitly averaging the reduced Wigner matrix to zero, rather than utilizing the 2π nutation to average spin interactions. This approach is applicable to both stationary and magic angle spinning solid-state NMR experiments." @default.
- W2017665087 created "2016-06-24" @default.
- W2017665087 creator A5046677875 @default.
- W2017665087 creator A5068241296 @default.
- W2017665087 date "2013-08-28" @default.
- W2017665087 modified "2023-09-23" @default.
- W2017665087 title "Motion-adapted pulse sequences for oriented sample (OS) solid-state NMR of biopolymers" @default.
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- W2017665087 doi "https://doi.org/10.1063/1.4819331" @default.
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