Ramachandran Plot: Difference between revisions
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== Plots of segments of [http://en.wikipedia.org/wiki/Alpha_helix α-helix] == | == Plots of segments of [http://en.wikipedia.org/wiki/Alpha_helix α-helix] == | ||
<applet load='Ahelix_2.pdb' size='300' frame='true' align='right' scene ='User:Karl_Oberholser/Ramachandran_Plots/Opening_helix/5' caption='Segments cut from a globular protein or segment of collagen' /> | <applet load='Ahelix_2.pdb' size='300' frame='true' align='right' scene ='User:Karl_Oberholser/Ramachandran_Plots/Opening_helix/5' caption='Segments cut from a globular protein or segment of collagen' /> | ||
Planes are drawn on some of the peptide bonds (displayed in second Jmol applet) to emphasize that in an α-helix the planar peptide bonds rotate about the axis of the helix. <scene name='User:Karl_Oberholser/Ramachandran_Plots/Opening_helix/5'>(Return to initial view)</scene> If you have not viewed an &alpha:-helix end on, rotate the structure 90° so that you can view the open center of the helix. The <scene name='User:Karl_Oberholser/Ramachandran_Plots/Plot1/3'>Ramachandran plot</scene> of this peptide has points clustered about the values of ψ= -47 and φ= -57 which are the average values for α-helices. <scene name='User:Karl_Oberholser/Ramachandran_Plots/Plot2/3'>Adding the values</scene> of two other helical segments demonstrates that data from all three appear in one large cluster and that the helical segments can not be distinguished by the differences in their ψ and φ values. | Planes are drawn on some of the peptide bonds (displayed in second Jmol applet) to emphasize that in an α -helix the planar peptide bonds rotate about the axis of the helix. <scene name='User:Karl_Oberholser/Ramachandran_Plots/Opening_helix/5'>(Return to initial view)</scene> If you have not viewed an &alpha:-helix end on, rotate the structure 90° so that you can view the open center of the helix. The <scene name='User:Karl_Oberholser/Ramachandran_Plots/Plot1/3'>Ramachandran plot</scene> of this peptide has points clustered about the values of ψ= -47 and φ= -57 which are the average values for α-helices. <scene name='User:Karl_Oberholser/Ramachandran_Plots/Plot2/3'>Adding the values</scene> of two other helical segments demonstrates that data from all three appear in one large cluster and that the helical segments can not be distinguished by the differences in their ψ and φ values. | ||
== Plots of segments of [http://en.wikipedia.org/wiki/Beta_sheet β-sheets] == | == Plots of segments of [http://en.wikipedia.org/wiki/Beta_sheet β-sheets] == | ||
