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Biochemistry: For parts a - d below, state whether or not the bond angles are observed...

Biochemistry: For parts a - d below, state whether or not the bond angles are observed (circle one) for protein secondary structures, and if so, state what kind of secondary structures.

a) φ = +9 0° Observed/ Not observed; Secondary Structure: ψ = - 45°

b) φ = - 130 ° Observed/ Not observed; Secondary Structure: ψ = +130 °

c) φ = - 60 ° Observed/ Not observed; Secondary Structure: ψ = - 50 °

d) φ = - 90 ° Observed/ Not observed; Secondary Structure: ψ = - 150°

Solutions

Expert Solution

Ans. According to Ramachandran plot, the secondary structures of proteins may have only a certain set of phi and psi angles which makes them thermodynamically stable in the specified conformation.

Correct option. c. Only this set of phi and psi angles are permitted (closest) in Ramachandran plot.

Given, Phi = -600 , psi = - 500. In Ramachandran plot, the closest secondary structure to it is right-handed alpha-helix (phi = -570 , psi = -470).

Options a, b, and d are not permitted by Ramachandran plot.

queen_honey_blossom answered 2 years ago
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