Question

what is the difference and significanece between psi and phi angles? please provide a detailed description.

Answer 1

e what and in the difference and phi angles? please significance between psi provide a detailed description An: Phi ù a rotation about the Ca-N Psi is a rotation about c- Ca bonds. bond the x Carbon (Ca) in the centre of each amino acid in held in the main chain by two rotatable bonds dihedral (torsion) angle of these fonds are called Phi and Psi (in Greek letter, and 4). . In fact, most Phi and Pse angle combination are impossible because two atoms cannot occupy the same space peptide torsion angle. - Calpha) Z Omug Phi psi 1 (alpha) o Omega - The torsim angles phi R H. and psi provide the flexibility U required for the polypeptide fig: a-helix geometry backbone to adopt a certain fold, Since the third possible tossich angle within the prostein fackbone is essentially flat and fixed to 180°.