Chapter 6: Q31P (page 178)
Under physiological conditions, polylysine assumes a random coil conformation. Under what conditions might it form an α helix?
The side chains of Lys will be neutralised if the pH is higher than the , allowing the helix to form.
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Explain why gelatin, which is mostly collagen, is nutritionally inferior to other types of protein.
How many peptide bonds are shown in the structure drawn in Fig. 6-7?
Why would you be unlikely to see an α helix containing only the following amino acids: Arg, Lys, Met, Phe, Trp, Tyr, Val?
In some proteins, the side-chain carboxylate carbon of an N-terminal glutamate residue reacts with the free amino group to form a pentagonal lactam, a cyclic structure containing ac=0 group. Draw the resulting pyroglutamate residue.
The X-ray crystallographic analysis of a protein often fails to reveal the positions of the first few and/or the last few residues of a polypeptide chain. Explain.
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