Difference between revisions of "Torsion angle"
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(New page: A torsion angle, also known as a dihedral angle, is formed by three consecutive bonds in a molecule and defined by the angle created between the two outer bonds. The backbone of a [[pr...) |
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The ω-bond has a slightly double bond character and is therefore almost always 180 degrees. The structure of a protein is mainly formed by the φ- and ψ-angles. <br> | The ω-bond has a slightly double bond character and is therefore almost always 180 degrees. The structure of a protein is mainly formed by the φ- and ψ-angles. <br> | ||
− | The following figure shows the location of the φ, ψ and & | + | The following figure shows the location of the φ, ψ and ω-angles<br> |
[[Image:torsion_angles.jpg]] <br> | [[Image:torsion_angles.jpg]] <br> | ||
− | [[Sidechain]]s can also contain torsion angles, they are indicated as [[chi- | + | [[Sidechain]]s can also contain torsion angles, they are indicated as [[chi-angle]]s. |
Revision as of 12:01, 30 July 2007
A torsion angle, also known as a dihedral angle, is formed by three consecutive bonds in a molecule and defined by the angle created between the two outer bonds. The backbone of a protein has three different torsion angles.
- The phi-angle (φ) - around the N-Cα bond
- The psi-angle (ψ) - around the Cα-C bond
- The omega-angle (ω) - around the peptide bond between C and N.
The ω-bond has a slightly double bond character and is therefore almost always 180 degrees. The structure of a protein is mainly formed by the φ- and ψ-angles.
The following figure shows the location of the φ, ψ and ω-angles
File:Torsion angles.jpg
Sidechains can also contain torsion angles, they are indicated as chi-angles.