alpha helix

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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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References in periodicals archive ?
Tossi, "Amphipathic alpha helical antimicrobial peptides," European Journal of Biochemistry, vol.268, no.3, pp.5589-5600,2001.
At 3 [degrees] C, most of the protein is in its alpha helical shape, and the crystals grow in only one direction, forming long columns.
So far, there's no evidence that the proteins that guide shell growth in mollusks have an alpha helical structure like the fish antifreeze proteins.