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- W2800044186 abstract "Abstract The beta (β)‐sheet structures of oligopeptides and polypeptides can be formed in anti‐parallel (AP) and parallel (P) forms, which is an important feature to understand such structures. In principle, P‐ and AP‐β‐sheet structures can be identified by the presence (AP) or absence (P) of inter‐strand 1 H NH / 1 H NH correlations on a diagonal in the corresponding 2D 1 H double quantum (DQ)/ 1 H single quantum (SQ) spectrum due to the different inter‐strand 1 H NH / 1 H NH distances between the two arrangements. However, the 1 H NH / 1 H NH peaks overlap with the 1 H NH3 + / 1 H NH3 + peaks, which always give cross‐peaks regardless of the β‐sheet arrangement. The 1 H NH3 + / 1 H NH3 + peaks disturb the observation of the presence/absence of 1 H NH / 1 H NH correlations and the assignment of 1 H NH and 1 H NH3 + is not always available. Here, 3D 14 N/ 1 H DQ/ 1 H SQ correlation solid‐state NMR experiments at fast magic angle spinning (70 kHz) are introduced to distinguish AP‐ and P‐β‐sheet structures. The 14 N dimension allows the distinction of 1 H NH / 1 H NH peaks from 1 H NH3 + / 1 H NH3 + peaks with clear assignments of 1 H NH and 1 H NH3 + . In addition, the high natural abundance of 1 H and 14 N enables 3D 14 N/ 1 H DQ/ 1 H SQ experiments of oligo‐alanines (Ala 3‐6 ) in four hours without isotope labelling." @default.
- W2800044186 created "2018-05-17" @default.
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- W2800044186 date "2018-06-08" @default.
- W2800044186 modified "2023-09-26" @default.
- W2800044186 title "3D <sup>14</sup> N/<sup>1</sup> H Double Quantum/<sup>1</sup> H Single Quantum Correlation Solid-State NMR for Probing the Parallel and Anti-Parallel Beta-Sheet Arrangement of Oligo-Peptides at Natural Abundance" @default.
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- W2800044186 doi "https://doi.org/10.1002/cphc.201800392" @default.
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