Definition: the helical form (commonly right-handed) present in many proteins, deduced by Pauling and Corey from x-ray diffraction studies of proteins such as a-keratin; the helix is stabilized by hydrogen bonds between, differet eupeptide bonds, R1R2C = O and HN(R3)R4' groups, symbolized by the center dot in R1R2C = O · HN(R3)R4. In a true a helix, there are 3.6 amino acid residues per turn of the helix and an increase of 1.5 ? per residue.
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