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User:Tilman Schirmer/Sandbox 100
From Proteopedia
(→Repetitive torsion angles) |
(→α-Helix) |
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==== α-Helix ==== | ==== α-Helix ==== | ||
| + | <applet load='180-180.pdb' size='400' frame='true' align='right' scene='User:Tilman_Schirmer/Sandbox_100/Extended/2'/> | ||
| - | + | A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure. | |
==== β-sheet ==== | ==== β-sheet ==== | ||
Revision as of 23:36, 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 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:
,
α-Helix
|
A polypeptide chain with a repetition of identical phi-psi torsion angles yields a helical structure.
