In peptides the values of dihedral angle phi (φ) is based on rotation around
(1) N-Ca bond
(2) Ca -C’ bond
(3) C’-N bond
(4) N-H bond
The phi (φ) angle in peptides is defined as the dihedral angle around the N–Cα bond. This angle is measured between the plane formed by the C’ (of the previous residue) – N – Cα and the plane formed by the N – Cα – C’ (of the current residue).
Thus, the correct answer is:
(1) N-Cα bond.
Related posts:
Which of the following statements are TRUE for hydrogen bonds? Strength of hydrogen bond is
phi, psi angles of a peptide segment adopting alpha helical conformation would be around
How many millilitres of 0.05 N HCI are required to neutralize eight grams of NaOH?
The φ and ψ values of a 310-helix is composed of all D. amino acids will mainly occupy which quadrant in the Ramachandran plot?
