Proteins are found to have two different types of secondary...

proteins are found to have two different types of secondary structures, viz, $\alpha$-helix and $\beta$-pleated sheet structure.
$\alpha$-helix structure of protein is stabilised by
(A) Peptide bonds
(B) van der Waals forces
(C) Hydrogen bonds
(D) Dipole-dipole interactions

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Key Concepts

Protein Secondary Structure

Protein secondary structure refers to the local spatial arrangement of the polypeptide backbone, which forms motifs such as the alpha helix and beta sheet. These structures are primarily stabilized by non-covalent interactions, particularly through hydrogen bonds between the backbone amide hydrogen and carbonyl oxygen atoms, providing the framework for a protein's overall conformation.

Alpha Helix

The alpha helix is a common secondary structure in proteins characterized by a right-handed coil where each backbone carbonyl oxygen atom forms a hydrogen bond with the amide hydrogen atom of the amino acid four residues earlier. This regular pattern of hydrogen bonding tightly stabilizes the helical shape and contributes to the protein's structural integrity.

Hydrogen Bonds

Hydrogen bonds are a type of non-covalent interaction that occur when a hydrogen atom, covalently bonded to an electronegative atom like nitrogen or oxygen, interacts with another electronegative atom. In the context of protein structures, these bonds are crucial for stabilizing secondary structures by linking different parts of the polypeptide chain in a regular, repeating manner.

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