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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The transmembrane prediction analysis indicated the nature and location of TlyA as a trans-membrane protein containing three stretches of seven, 13 and 21 amino-acids or trans-membrane alpha helices.
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.