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The stability of alpha –helix structure is due to intramolecular of H-bonding between –NH- and –CO- groups of the same polypeptide chain. The alpha-helix is termed as 3.6 13 helix as each turn of the helix has nearly 3.6 amino acids and the hydrogen bonding leads to the formation of a 13-membered ring.

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Biomolecules

Short Answer Type

161.
Which forces are responsible for the stability of α-helix? Why is it named as 3.6 helix?

The stability of alpha –helix structure is due to intramolecular of H-bonding between –NH- and –CO- groups of the same polypeptide chain. The alpha-helix is termed as 3.6₁₃ helix as each turn of the helix has nearly 3.6 amino acids and the hydrogen bonding leads to the formation of a 13-membered ring.

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