Ramachandran Torsion-Angle Explorer

Every protein backbone is built from the same rigid peptide unit repeated over and over, so its entire 3D shape reduces to two rotatable dihedral angles per residue — φ (phi) and ψ (psi). This simulator constructs a real peptide backbone atom-by-atom using the NeRF internal-coordinate method (the same technique structure-prediction tools use), lets you drag φ/ψ for any residue or apply a whole-chain preset (α-helix, β-strand, polyproline-II), and mirrors every change on a live Ramachandran plot that shows whether the current conformation sits in a sterically favored basin, an allowed edge region, or a disallowed zone where the 3D model itself develops a real atomic clash.