Vibrational analysis of peptides, polypeptides, and proteins. XXX. Normal mode analyses of gamma-turns
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Updated: Aug 16, 2026

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
Abstract:
The normal modes have been calculated for three kinds of low energy gamma-turn structures resulting from recent conformational energy calculations by Némethy. Frequencies have been computed for a gamma-turn, a mirror-related gamma-turn, and an inverse gamma-turn of CH3-CO-(L-Ala)n-NH-CH3, with n = 3 and n = 5, and for certain 14C and 15N derivatives of the n = 3 molecule. Correlations are evident between amide frequencies and gamma-turn structures, and it is found that only amide I modes of peptide groups in the turn are relatively insensitive to the lengths of attached chains.
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