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User:Tilman Schirmer/Sandbox 100
From Proteopedia
(→Repetitive torsion angles) |
(→Repetitive torsion angles) |
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A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure. | A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure. | ||
| + | |||
| + | ---- | ||
phi-psi = (180<sup>o</sup>, 180<sup>o</sup>), fully extended chain: | phi-psi = (180<sup>o</sup>, 180<sup>o</sup>), fully extended chain: | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Extended/2'>model</scene>, | <scene name='User:Tilman_Schirmer/Sandbox_100/Extended/2'>model</scene>, | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Extended/3'> Calpha-trace</scene><br> | <scene name='User:Tilman_Schirmer/Sandbox_100/Extended/3'> Calpha-trace</scene><br> | ||
| + | |||
| + | ---- | ||
phi-psi = (-140<sup>o</sup>, 130<sup>o</sup>), extended chain: | phi-psi = (-140<sup>o</sup>, 130<sup>o</sup>), extended chain: | ||
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the polypeptide main-chain is <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/3'>left-twisted</scene> as can been seen when looking along the chain <br> | the polypeptide main-chain is <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/3'>left-twisted</scene> as can been seen when looking along the chain <br> | ||
| + | |||
| + | ---- | ||
phi-psi = (70<sup>o</sup>, 180<sup>o</sup>): | phi-psi = (70<sup>o</sup>, 180<sup>o</sup>): | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Elongated_helix/1'>model</scene>, | <scene name='User:Tilman_Schirmer/Sandbox_100/Elongated_helix/1'>model</scene>, | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Elongated_helix/2'>Calpha-trace</scene>; note that there are clashes (where?)<br> | <scene name='User:Tilman_Schirmer/Sandbox_100/Elongated_helix/2'>Calpha-trace</scene>; note that there are clashes (where?)<br> | ||
| + | |||
| + | ---- | ||
phi-psi = (-60<sup>o</sup>, -40<sup>o</sup>), '''α-helix''': | phi-psi = (-60<sup>o</sup>, -40<sup>o</sup>), '''α-helix''': | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Helix/1'>model</scene>, | <scene name='User:Tilman_Schirmer/Sandbox_100/Helix/1'>model</scene>, | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Helix/2'>Calpha-trace</scene><br> | <scene name='User:Tilman_Schirmer/Sandbox_100/Helix/2'>Calpha-trace</scene><br> | ||
| + | |||
| + | ---- | ||
phi-psi = (-50<sup>o</sup>, -26<sup>o</sup>), '''3<sub>10</sub> helix''': | phi-psi = (-50<sup>o</sup>, -26<sup>o</sup>), '''3<sub>10</sub> helix''': | ||
Revision as of 13:59, 19 March 2009
Contents |
Secondary structure of proteins
Repetitive torsion angles
|
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 = (-140o, 130o), extended chain:
,
; this is the β-strand conformation found in beta-sheets
Note:
polypeptide forms a zig-zag with side-chains protruding towards alternating (up, down) directions
the polypeptide main-chain is as can been seen when looking along the chain
phi-psi = (70o, 180o):
,
; note that there are clashes (where?)
phi-psi = (-60o, -40o), α-helix:
,
phi-psi = (-50o, -26o), 310 helix:
,
