+180 120 60 -60 -120 -180 -180 -120 -60 (o = 90°, =-90°) Disfavored 60 120 +180 FIGURE 2.23 A Ramachandran plot showing the values of o and w. Not all o and values are possible without collisions between atoms. The most favorable regions are shown in dark green; borderline regions are shown in light green. The structure on the right is disfavored because of steric clashes.

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Ramachandran plots for two amino acids differ significantly from that shown in Figure 2.23. Which two, and why?

+180
120
60
-60
-120
-180
-180 -120 -60
(o = 90°, =-90°)
Disfavored
60
120 +180
FIGURE 2.23 A Ramachandran plot showing the values of o and w. Not all o and
values are possible without collisions between atoms. The most favorable regions are shown
in dark green; borderline regions are shown in light green. The structure on the right is
disfavored because of steric clashes.
Transcribed Image Text:+180 120 60 -60 -120 -180 -180 -120 -60 (o = 90°, =-90°) Disfavored 60 120 +180 FIGURE 2.23 A Ramachandran plot showing the values of o and w. Not all o and values are possible without collisions between atoms. The most favorable regions are shown in dark green; borderline regions are shown in light green. The structure on the right is disfavored because of steric clashes.
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