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Regular Ways to Fold the Polypeptide Chain
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Description
a) In the a-helix the hydrogen bonds are within a single polypeptide chain and are almost parallel to the helix axis.

   The alignment of amide bonds in the helix gives rise to a macrodipole moment.

   The N-terminal end of the helix has a d+ charge and the C-terminal end has a d- charge.

(b) In the b-sheet, the hydrogen bonds are between adjacent chains and are nearly perpendicular to the chains.

(c) The 310 helix is found in proteins; but, is less common than the a-helix.
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