There is an important difference between the extent of Hydrogen bonding in the m

Question

There is an important difference between the extent of Hydrogen bonding in the middle of a stretch of alpha helix and that at the 4 amino-terminal and carboxyl terminal residues of the alpha helix. What is this difference? There is an important difference between the extent of Hydrogen bonding in the middle of a stretch of alpha helix and that at the 4 amino-terminal and carboxyl terminal residues of the alpha helix. What is this difference? There is an important difference between the extent of Hydrogen bonding in the middle of a stretch of alpha helix and that at the 4 amino-terminal and carboxyl terminal residues of the alpha helix. What is this difference?

Explanation / Answer

in an alpha helix, the carbonyl oxygen atom of each residue accepts a hydrogen bond from the amide nitrogen four nitrogens furher along in the sequence, so that all of the polar amide groups in the helix ar e hydrogen bonded to one another except for the N-H group of the first residue in the helical segment. the result is a cylindrical structure wherre the wall of the cylinder is formed by the hydrogen bonded back bon, and outside is studded with side chains.

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