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Updated: Jun 12, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction
Published on: November 3, 2011
omega-Helices in proteins
Purevjav Enkhbayar1, Bazartseren Boldgiv, Norio Matsushima
1Department of Biophysics and Bioinformatics, National University of Mongolia, Ulaanbaatar, Mongolia.
Abstract:
A modification of the alpha-helix, termed the omega-helix, has four residues in one turn of a helix. We searched the omega-helix in proteins by the HELFIT program which determines the helical parameters-pitch, residues per turn, radius, and handedness-and p = rmsd/(N - 1)(1/2) estimating helical regularity, where "rmsd" is the root mean square deviation from the best fit helix and "N" is helix length. A total of 1,496 regular alpha-helices 6-9 residues long with p < or = 0.10 A were identified from 866 protein chains. The statistical analysis provides a strong evidence that the frequency distribution of helices versus n indicates the bimodality of typical alpha-helix and omega-helix. Sixty-two right handed omega-helices identified (7.2% of proteins) show non-planarity of the peptide groups. There is amino acid preference of Asp and Cys. These observations and analyses insist that the omega-helices occur really in proteins.
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