Correlation between 15N NMR chemical shifts in proteins and secondary structure |
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Authors: | Hongbiao Le Eric Oldfield |
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Institution: | (1) Department of Chemistry, University of Illinois at Urbana-Champaign, 505 South Mathews Avenue, 61801 Urbana, IL, USA |
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Abstract: | Summary An empirical correlation between the peptide 15N chemical shift, 15Ni, and the backbone torsion angles i, i–1 is reported. By using two-dimensional shielding surfaces ( i 1–1), it is possible in many cases to make reasonably accurate predictions of 15N chemical shifts for a given structure. On average, the rms error between experiment and prediction is about 3.5 ppm. Results for threonine, valine and isoleucine are worse ( 4.8 ppm), due presumably to 1-distribution/ -gauche effects. The rms errors for the other amino acids are 3 ppm, for a typical maximal chemical shift range of 15–20 ppm. Thus, there is a significant correlation between 15N chemical shift and secondary structure. |
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Keywords: | Secondary structure Shielding surface 15N shielding Torsion angle |
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