alpha helix

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Related to Alpha-helix: Beta-sheet

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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5,440,013 and 5,446,128, issued on August 8 and August 29, provide protection for the more efficient, reproducible construction of conformationally restricted beta-turn, beta-bulge and alpha-helix mimics.
Studying the configuration of how calpastatin bound to the active site of the calpain complex, "we found that there was a small alpha-helix that fit into the active site of the calpain enzyme," Greenbaum said.
Whereas a single alpha-helix consists of an elegant spiral of 15 to 20 amino acids, the beta sheet requires 60 to 70 amino acids.