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User:Tilman Schirmer/Sandbox 100
From Proteopedia
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Secondary structure of proteins
Repetitive torsion angles
A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure.
Examples: fully extended chain: phi-psi = (180, 180), model, Ca-trace extended chain: phi-psi = (-140, 130), model, Ca-trace; this is the beta-strand conformation found in beta-sheets phi-psi = (70, -180), model, Ca-trace; note the severe clashes phi-psi = (-60, -40), model, Ca-trace; this is the alpha-helical conformation phi-psi = (-50, -26), model, Ca-trace; this is the conformation of a 310 helix
