This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.
Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.
User:Tilman Schirmer/Sandbox 100
From Proteopedia
| Line 11: | Line 11: | ||
Examples: <br> | Examples: <br> | ||
| - | <applet load='180-180.pdb' size='300' frame='true' align='right' caption='...' /> | + | <applet load='180-180.pdb' size='300' frame='true' align='right' scene='User:Tilman_Schirmer/Sandbox_100/Extended/2'caption='...' /> |
fully extended chain: phi-psi = (180<sup>o</sup>, 180<sup>o</sup>), | fully extended chain: phi-psi = (180<sup>o</sup>, 180<sup>o</sup>), | ||
<scene name='User:Tilman_Schirmer/Sandbox_100/Extended/2'>model</scene>, | <scene name='User:Tilman_Schirmer/Sandbox_100/Extended/2'>model</scene>, | ||
Revision as of 13:16, 15 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.
Examples:
Drag the structure with the mouse to rotate fully extended chain: phi-psi = (180o, 180o), ,
extended chain: phi-psi = (-140o, 130o), , ; this is the beta-strand conformation found in beta-sheets, note the of the polypeptide
phi-psi = (70o, -180o), model, Cα-trace; note that there are clashes (where?)
phi-psi = (-60o, -40o), model, Cα-trace; this is the alpha-helical conformation
phi-psi = (-50o, -26o), model, Cα-trace; this is the conformation of a 310 helix
