The reason why pro residues can occupy N-terminal turn of an α helix. Concept introduction: Proteins are made up of one or more amino acids linked together to form a chain. The building blocks of the protein are called amino acids. The secondary structure of proteins is the formation of alpha helix and beta-pleated sheets. α helix is formed when the peptide bond (C=O) of the nth residue along the helical axis points toward the peptide N—H group of the (n+4)th residue.

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Chapter 6, Problem 25CQ

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To explain: The reason why pro residues can occupy N-terminal turn of an α helix.

Concept introduction: Proteins are made up of one or more amino acids linked together to form a chain. The building blocks of the protein are called amino acids. The secondary structure of proteins is the formation of alpha helix and beta-pleated sheets. α helix is formed when the peptide bond (C=O) of the nth residue along the helical axis points toward the peptide N—H group of the (n+4)th residue.

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