alpha helix

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Related to Alpha helices: alpha helix, Beta sheets

alpha helix

[′al·fə ′hē·liks]
(cell and molecular biology)
A spatial configuration of the polypeptide chains of proteins in which the chain assumes a helical form, 0.54 nanometer in pitch, 3.6 amino acids per turn, presenting the appearance of a hollow cylinder with radiating side groups.
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1995) Intrinsic stability of individual alpha helices modulates structure and stability of the apomyoglobin molten globule form.
Formation of alpha helices and beta sheets is more difficult when its sequence contains large number of proline.
The most common secondary structures are alpha helices and beta sheets.