Proteopedia:Featured EDU/1
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| Tutorial: The Ramachandran principle, phi (φ) and psi (ψ) angles in proteins |
| Eric Martz |
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The Ramachandran Principle says that alpha helices, beta strands, and turns are the most likely conformations for a polypeptide chain to adopt, because most other conformations are impossible due to steric collisions between atoms. Check Show Clashes to see where non-bonded atoms are overlapping, and thus in physically impossible positions. (This model simulation allows two atoms to overlap, unlike real atoms.) |