BIOMOLECULES AND ENZYMES

Detailed explanation-1: -−helix is a secondary structure of proteins formed by twisting of polypeptide chain to right handed screw like structure. Hydrogen bonds formed between-NH-group of amino acids in one turn with the >C=O groups of amino acids belonging to adjacent turn is responsible for making the −helix structure stable.

Detailed explanation-2: -An -helix secondary structure is stabilized by hydrogen bonds between carbonyl oxygen and the amino group of every third residue in the helical turn with each helical turn consisting of 3.6 amino acid residues (Fig. 10.1A). The side chain of amino acids is projected outward from the outer helical surface.

Detailed explanation-3: -Secondary structure refers to regular, recurring arrangements in space of adjacent amino acid residues in a polypeptide chain. It is maintained by hydrogen bonds between amide hydrogens and carbonyl oxygens of the peptide backbone.