Dihedral/Dihedral angles in proteins
From Proteopedia
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(rotation around psi angle) |
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This page illustrates the meaning of phi (ϕ) and psi (ψ) angles, both around the alpha carbon of the central residue (Glu<sub>35</sub>). | This page illustrates the meaning of phi (ϕ) and psi (ψ) angles, both around the alpha carbon of the central residue (Glu<sub>35</sub>). | ||
| - | You can run animations that continuously rotate the model changing one of the angles, or use the slider or controls to manually progress through different values of the angles. | + | phi (ϕ) is the angle between the planes displayed as <span style="background-color:thistle; padding:0 1.5ex; margin-right:0.5ex; font-size:0.7em;"></span><span style="font-size:0.7em; color:#555;">(1)</span> and <span style="background-color:plum; padding:0 1.5ex; margin-right:0.5ex; font-size:0.7em;"></span><span style="font-size:0.7em; color:#555;">(2)</span> |
| - | Bright magenta cylinders are displayed where neighbour atoms collide (hence there is an unfavourable conformation for those ϕ, ψ values). | + | |
| + | psi (ψ) is the angle between the planes displayed as <span style="background-color:moccasin; padding:0 1.5ex; margin-right:0.5ex; font-size:0.7em;"></span><span style="font-size:0.7em; color:#555;">(3)</span> and <span style="background-color:sandybrown; padding:0 1.5ex; margin-right:0.5ex; font-size:0.7em;"></span><span style="font-size:0.7em; color:#555;">(4)</span> | ||
| + | |||
| + | (planes 2 and 3 coincide) | ||
| + | |||
| + | |||
| + | You can run animations that continuously rotate the model changing one of the angles. | ||
| + | <!--, or use the slider or controls to manually progress through different values of the angles.--> | ||
| + | Bright magenta cylinders are displayed where neighbour atoms collide (hence there is an unfavourable conformation for those particular ϕ, ψ values). | ||
<jmol> | <jmol> | ||
<jmolButton> | <jmolButton> | ||
| - | <text>Prepare</text> | + | <text>Prepare ϕ</text> |
<script>zap; set echo middle center; echo please wait...; refresh; script /wiki/images/c/ce/Phi-rot_uni.spt; </script> | <script>zap; set echo middle center; echo please wait...; refresh; script /wiki/images/c/ce/Phi-rot_uni.spt; </script> | ||
</jmolButton> | </jmolButton> | ||
</jmol> | </jmol> | ||
| - | + | animation, and then: | |
<jmol> | <jmol> | ||
<jmolButton> | <jmolButton> | ||
| - | <text>play</text> | + | <text>play/pause</text> |
| - | <script> | + | <script>if(_animating) {frame pause} else {frame play}</script> |
</jmolButton> | </jmolButton> | ||
</jmol> | </jmol> | ||
| - | <jmol> | ||
| - | <jmolButton> | ||
| - | <text>pause</text> | ||
| - | <script>anim pause; </script> | ||
| - | </jmolButton> | ||
| - | </jmol> | ||
<jmol> | <jmol> | ||
<jmolButton> | <jmolButton> | ||
| - | <text>Prepare</text> | + | <text>Prepare ψ</text> |
<script>zap; set echo middle center; echo please wait...; refresh; script /wiki/images/2/22/Psi-rot_uni.spt; </script> | <script>zap; set echo middle center; echo please wait...; refresh; script /wiki/images/2/22/Psi-rot_uni.spt; </script> | ||
</jmolButton> | </jmolButton> | ||
</jmol> | </jmol> | ||
| - | + | animation, and then: | |
<jmol> | <jmol> | ||
<jmolButton> | <jmolButton> | ||
| - | <text>play</text> | + | <text>play/pause</text> |
| - | <script> | + | <script>if(_animating) {frame pause} else {frame play}</script> |
</jmolButton> | </jmolButton> | ||
</jmol> | </jmol> | ||
| - | <jmol> | ||
| - | <jmolButton> | ||
| - | <text>pause</text> | ||
| - | <script>anim pause; </script> | ||
| - | </jmolButton> | ||
| - | </jmol> | ||
</td> | </td> | ||
Revision as of 22:49, 14 July 2016
Dihedral angles in proteins: Phi and Psi
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The model displayed on the right is a tripeptide (Trp34–Glu35–Ser36 within the protein lysozyme). This page illustrates the meaning of phi (ϕ) and psi (ψ) angles, both around the alpha carbon of the central residue (Glu35). phi (ϕ) is the angle between the planes displayed as (1) and (2) psi (ψ) is the angle between the planes displayed as (3) and (4) (planes 2 and 3 coincide)
animation, and then: animation, and then: |
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