User:Tilman Schirmer/Sandbox 110

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<li> the <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/5'>side-chains</scene> point towards alternate directions<br><br>
<li> the <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/5'>side-chains</scene> point towards alternate directions<br><br>
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Also strands with a <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/3'>left-twist</scene> are allowed, but they occur less frequent. This strand has phi-psi values of (-110<sup>o</sup>, 130<sup>o</sup>).
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Revision as of 13:31, 15 March 2010

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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
  • the polypeptide main-chain is as can been seen when looking along the chain
  • the point towards alternate directions

    Also strands with a are allowed, but they occur less frequent. This strand has phi-psi values of (-110o, 130o).

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

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

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

    Proteopedia Page Contributors and Editors (what is this?)

    Tilman Schirmer

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