Ramachandran Map — Protein Secondary Structure

Protein type Point opacity: 0.7 Jitter: 8°

α-Helix (φ≈-57°, ψ≈-47°)

β-Sheet (φ≈-120°, ψ≈130°)

Left α-Helix (φ≈+57°, ψ≈+47°)

3₁₀ Helix (φ≈-60°, ψ≈-30°)

π-Helix (φ≈-57°, ψ≈-70°)

Disallowed region

Energy: E(φ,ψ) ∝ sum of
pairwise van der Waals
& electrostatic terms

Allowed: E < threshold
favored: E << threshold

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