6) Ramachandran Plot.
+180
0
-180
Gly 12
• Gly 28
Gly 37
0
+180
a) Given the Ramachandran plot above for bovine pancreatic trypsin inhibitor (BPTI),
which of the following combinations of $\psi$ and $\phi$ angles would you expect to be common
in structural models of proteins? ($\psi$, $\phi$): ($-120$, $120$), ($-120$, $-60$), and ($-120$, $-120$). Why
or why not?
b) Which region would you associate with a high-energy or generally \"disallowed\"
conformation?
c) Comment on the three apparent \"outliers\" on this plot, and why they are in fact
\"allowed\".