Question
Write a note on the formation of α-helix.
✓
Answer
1. In the $\alpha$-helix substructure, the amino acids are arranged in a right-handed helical (spiral) structure and are stabilized by the hydrogen bond between the carbonyl oxygen one amino acid ( $n{ }^{\text {th }}$ residue) with amino hydrogen of the fifth residue ( $n+4^{\text {th }}$ residue).
2. The side chains of the residues protrude outside of the helix. Each turn of an $\alpha$-helix contains about 3.6 residues and is about $5.4 \AA$ long.
3. The amino acid proline produces a line in the helical structure and is often called a helical breaker due to its rigid cyclic structure.
4. Many fibrous proteins such as $\alpha$-Keratin in hair, nails, wool, skin, and myosin in muscles have $\alpha$-helix structure. The stretching property of human hair is due to the helical structure of $\alpha$-keratin in hair.
Secondary structure of proteins
2. The side chains of the residues protrude outside of the helix. Each turn of an $\alpha$-helix contains about 3.6 residues and is about $5.4 \AA$ long.
3. The amino acid proline produces a line in the helical structure and is often called a helical breaker due to its rigid cyclic structure.
4. Many fibrous proteins such as $\alpha$-Keratin in hair, nails, wool, skin, and myosin in muscles have $\alpha$-helix structure. The stretching property of human hair is due to the helical structure of $\alpha$-keratin in hair.
Secondary structure of proteins
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