User:Tilman Schirmer/Sandbox 110

(Difference between revisions)

Revision as of 08:31, 24 February 2010

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

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

phi-psi = (-140^o, 130^o), 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

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

phi-psi = (-60^o, -40^o), α-helix: ,

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

@@ Line 23: / Line 23: @@
 polypeptide forms a <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/4'>zig-zag</scene> with side-chains protruding towards alternating (up, down) directions<br>
-the polypeptide main-chain is <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/3'>right-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>
 the <scene name='User:Tilman_Schirmer/Sandbox_100/Beta/5'>side-chains</scene> point towards alternate directions<br>