User:Tilman Schirmer/Sandbox 110
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(New page: ====Repetitive torsion angles ==== <applet load='180-180.pdb' size='400' frame='true' align='right' scene='User:Tilman_Schirmer/Sandbox_100/Extended/2'/> A polypeptide chain with a repet...) |
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====Repetitive torsion angles ==== | ====Repetitive torsion angles ==== | ||
<applet load='180-180.pdb' size='400' frame='true' align='right' scene='User:Tilman_Schirmer/Sandbox_100/Extended/2'/> | <applet load='180-180.pdb' size='400' frame='true' align='right' scene='User:Tilman_Schirmer/Sandbox_100/Extended/2'/> | ||
Revision as of 08:13, 10 November 2009
Repetitive torsion angles
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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
the point towards alternate directions
phi-psi = (70o, 180o):
,
; note that there are clashes (where?)
phi-psi = (-60o, -40o), α-helix:
,
phi-psi = (-50o, -26o), 310 helix: ,
