Determination of the solid-state conformations of polyalanine using magic-angle spinning NMR spectroscopy

Article Abstract:

Research was conducted to determine the solid-state conformations of polyalanine using magic-angle spinning NMR spectroscopy. The characterization of the backbone conformations of the powder samples of poly-L-alanine was performed by 13C cross-polarization magic-angle spinning and 1H combined rotation and multiple pulse solid-state NMR spectroscopy. Results indicate that high-resolution solid-state NMR spectroscopy, at higher external magnetic fields with higher spinning speeds, would be useful in the structure determination of homopolypeptides.

Conformational analysis, Polypeptides, Solid state chemistry

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How does an amide-(sub 15)N chemical shift tensor vary in peptides?

Article Abstract:

A study that addresses a void in the existing literature of the amide-(sub 15)N chemical shift anisotropy (CSA) tensor of peptides, which draws a systematic investigation of how the tensor varies in different peptides, is presented. The results revealed that the amide-(sub 15)N CSA tensor of a given tripeptide could be extrapolated to the same sequence in any other polypeptide, provided that the backbone conformations and intermolecular environment are equivalent.

Science & research, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Nitrogen Compounds, Peptides, Chemistry, Physical and theoretical, Physical chemistry, Amides, Chemical properties

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