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`alpha-`helix is a secondary structure of proteins formed by twisting of polypeptide chain into right handed screw like structure. Which type of interactions are responsible for making the `alpha`-helix structure stable?

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The `alpha`-helix structure of polypeptide chain is stabilized by intramolecular H-bonding in which `gt C=O` of one amino acid residue in one turn forms a H-bond with `-NH-` group of the fourth amino acid in the adjacent turn.
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Knowledge Check

  • An alpha -helix is a structural feature of

    A
    Sucrose.
    B
    Polypeptides.
    C
    Nucleotides.
    D
    Starch.

  • Two types of secondary structures of proteins are

    A
    `alpha`- helix and `beta` -helix
    B
    `alpha ` - helix and `beta`-helix
    C
    `alpha`-helix and `beta`- pleated sheet
    D
    Helix and rod.

  • Out of the following, which type of interaction is responsible for the stabilisation ofa-helix structure of proteins?

    A
    Ionic bonding
    B
    Hydrogen bonding
    C
    Covalent bonding
    D
    vander Waals forces

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    The alpha -helical structure of protein is stabilized by

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