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 ?
This fraction is reduced to approximately 60% for a helix angle in the range of 50-60 [degrees].
There, parallel strands that would normally lie in a flat sheet instead curl into a helix.
and VistaMed, a Helix Medical joint venture partner in Carrick-on-Shannon, Ireland.