⚠ steric clash
drag to rotate • scroll to zoom
N
Cα
C=O
clashing atom
Ramachandran plot — each dot is one residue; the ring is the selected one
Ramachandran plot — each dot is one residue; the ring is the selected one
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 2D-canvas simulator constructs a real peptide backbone atom-by-atom in 3D using the NeRF internal-coordinate method (the same technique structure-prediction tools use), projects it onto the canvas so you can drag to rotate the view, 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.