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- W2024779504 abstract "Spin-lattice relaxation of 13C multiplet spectra and [1H]-13C nuclear Overhauser enhancement (NOE) coefficients of selectively 13C-enriched glycines in a collagen GXX-repeat motif hexadecapeptide, G1VKG4DKG7NPG10WPG13APY, has been investigated. Data have been collected at two 13C Larmor frequencies (90 and 150 MHz) over the temperature range from 5 to 70 degrees C. Relaxation data indicate that the most restricted internal rotations are at G7 and G10. Mobility of other glycine residues can be arranged in the order G4, G13, and G1. G1 glycine shows that least change in motional anisotropy with temperature. Several motional models have been used to explain the experimental data. While any one model is not completely satisfactory in describing all experimental parameters, only the model of restricted internal diffusion yields the observed positive sign for the cross-correlated spectral densities. Energetic and angular limits of psi, phi bond rotational motions derived from relaxation data and the restricted diffusion model are in good agreement with those calculated as Ramachandran potentional energy profiles. G1 rotational energy barriers for overall tumbling and internal rotation are approximately equal, suggesting strong interaction between the N-terminus and water. Internal rotational parameters for GV and GG dipeptides confirm this view. Nonterminal glycine internal motions are apparently less dependent on water-peptide interactions." @default.
- W2024779504 created "2016-06-24" @default.
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- W2024779504 date "1993-10-12" @default.
- W2024779504 modified "2023-10-01" @default.
- W2024779504 title "Carbon-13 nuclear magnetic resonance relaxation-derived .psi., .PHI. bond rotational energy barriers and rotational restrictions for glycine 13C.alpha.-methylenes in a GXX-repeat hexadecapeptide" @default.
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- W2024779504 doi "https://doi.org/10.1021/bi00091a007" @default.
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