BIOMOLECULES AND ENZYMES

Detailed explanation-1: -In proteins the two torsion angles and describe the rotation of the polypeptide chain around the two bonds on both sides of the C atom. In a polypeptide the main chain N-C alpha and C alpha-C bonds relatively are free to rotate. These rotations are represented by the torsion angles phi and psi, respectively.

Detailed explanation-2: -Each amino acid contains two bonds that can readily rotate-this includes the phi angle and the psi angle.

Detailed explanation-3: -The Ramachandran plot is a plot of the torsional angles-phi ()and psi ()-of the residues (amino acids) contained in a peptide. In sequence order, is the C(i-1), N(i), Ca(i), C(i) torsion angle and is the N(i), Ca(i), C(i), N(i+1) torsion angle. The plot was developed in 1963 by G. N. Ramachandran, et.

Detailed explanation-4: -The phi angle is the angle around the-N-CA-bond (where ‘CA’ is the alpha-carbon) The psi angle is the angle around the-CA-C-bond. The omega angle is the angle around the-C-N-bond (i.e. the peptide bond)