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Dihedral/Dihedral angles in proteins

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Revision as of 22:49, 14 July 2016 by Angel Herraez (Talk | contribs)
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Dihedral angles in proteins: Phi and Psi

The model displayed on the right is a tripeptide (Trp34–Glu35–Ser36 within the protein lysozyme). This page illustrates the meaning of phi (ϕ) and psi (ψ) angles, both around the alpha carbon of the central residue (Glu35).

phi (ϕ) is the angle between the planes displayed as (1) and (2)

psi (ψ) is the angle between the planes displayed as (3) and (4)

(planes 2 and 3 coincide)


You can run animations that continuously rotate the model changing one of the angles. Bright magenta cylinders are displayed where neighbour atoms collide (hence there is an unfavourable conformation for those particular ϕ, ψ values).

animation, and then:

animation, and then:

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

Angel Herraez

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