User:Tilman Schirmer/Sandbox 110

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Repetitive torsion angles

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A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure.

phi-psi = (180o, 180o), fully extended chain: ,

phi-psi = (-110o, 130o), extended chain: , , ; this is the β-strand conformation found in beta-sheets


Note:

  • polypeptide forms a with side-chains protruding towards alternating (up, down) directions</li>
    the polypeptide main-chain is as can been seen when looking along the chain
    the point towards alternate directions

    phi-psi = (70o, 180o): , ; note that there are clashes (where?)

    phi-psi = (-60o, -40o), α-helix: ,

    phi-psi = (-50o, -26o), 310 helix: ,

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    Tilman Schirmer

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