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User:Tilman Schirmer/Sandbox 100

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Current revision (16:12, 16 February 2017) (edit) (undo)
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----
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see also preceding chapter [[User:Tilman_Schirmer/Sandbox_99|peptide bond]]
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----
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== Secondary structure of proteins ==
== Secondary structure of proteins ==
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====Repetitive torsion angles ====
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outline:
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<applet load='180-180.pdb' size='300' frame='true' align='right' scene='User:Tilman_Schirmer/Sandbox_100/Extended/2'/>
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A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure.
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[[User:Tilman Schirmer/Sandbox 110|Repetitive torsion angles]]
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phi-psi = (180<sup>o</sup>, 180<sup>o</sup>), fully extended chain:
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[[User:Tilman Schirmer/Sandbox 111|α-Helix]]
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<scene name='User:Tilman_Schirmer/Sandbox_100/Extended/2'>model</scene>,
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<scene name='User:Tilman_Schirmer/Sandbox_100/Extended/3'> Calpha-trace</scene><br>
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phi-psi = (-140<sup>o</sup>, 130<sup>o</sup>), extended chain,
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[[User:Tilman Schirmer/Sandbox 112|parallel β-sheet]]
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<scene name='User:Tilman_Schirmer/Sandbox_100/Beta/1'>model</scene>,
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<scene name='User:Tilman_Schirmer/Sandbox_100/Beta/2'>Calpha-trace</scene>; this is the β-strand conformation found in beta-sheets, note the <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/3'>left-twist</scene> for a polypeptide with this conformation <br>
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phi-psi = (70<sup>o</sup>, -180<sup>o</sup>),
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[[User:Tilman Schirmer/Sandbox 113|antiparallel β-sheet]]
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<scene name='User:Tilman_Schirmer/Sandbox_100/Elongated_helix/1'>model</scene>,
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<scene name='User:Tilman_Schirmer/Sandbox_100/Elongated_helix/2'>Calpha-trace</scene>; note that there are clashes (where?)<br>
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phi-psi = (-60<sup>o</sup>, -40<sup>o</sup>), α-helix:
 
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<scene name='User:Tilman_Schirmer/Sandbox_100/Helix/1'>model</scene>,
 
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<scene name='User:Tilman_Schirmer/Sandbox_100/Helix/2'>Calpha-trace</scene><br>
 
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phi-psi = (-50<sup>o</sup>, -26<sup>o</sup>),3<sub>10</sub> helix:
 
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<scene name='User:Tilman_Schirmer/Sandbox_100/310helix/1'>model</scene>,
 
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<scene name='User:Tilman_Schirmer/Sandbox_100/310helix/2'>Calpha-trace</scene> <br>
 
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==== α-Helix ====
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== Next Topic ==
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[[User:Tilman_Schirmer/Sandbox_120|anatomy of a protein]]
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== Notes ==
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==== β-sheet ====
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see also http://proteopedia.org/wiki/index.php/User:James_D_Watson/Structural_Templates, [[Secondary_structure]]

Current revision

see also preceding chapter peptide bond

Secondary structure of proteins

outline:

Repetitive torsion angles

α-Helix

parallel β-sheet

antiparallel β-sheet


Next Topic

anatomy of a protein

Notes

see also http://proteopedia.org/wiki/index.php/User:James_D_Watson/Structural_Templates, Secondary_structure

Proteopedia Page Contributors and Editors (what is this?)

Tilman Schirmer

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