Question

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

Answer 1

$\alpha -$ Helix is one of the most common ways in which a polypeptide chain forms all possible hydrogen bonds by twisting into a right-handed screw (helix) like structure with the $-NH$ group of each amino acid residue hydrogen bonded to the $C=0$ of an adjacent turn of the helix. It is one of the secondary structure of protein.