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Chapter 21: Q28P (page 1004)

Which bonds in the backbone of a peptide can rotate freely?

Short Answer

Expert verified

The partial double-bond character prevents free rotation about the peptide bond, so the carbon and nitrogen atoms of the peptide bond and the two atoms to which each is attached are held rigidly in a plane. This regional planarity affects the way a chain of amino acids can fold.

Step by step solution

01

Step-by-step-solutionStep 1: Rotation around peptide bond

The partial double-bond character prevents free rotation about the peptide bond, so the carbon and nitrogen atoms of the peptide bond and the two atoms to which each is attached are held rigidly in a plane. This regional planarity affects the way a chain of amino acids can fold.

02

Backbone of a peptide

The alpha carbon (α-carbon or Cα) is what connects the amino group to the acid carboxyl group. The bonds on either side of the α-carbon in the backbone of a peptide can freely rotate.

Backbone of a peptide

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Most popular questions from this chapter

Draw the form of aspartate that predominates at the following pH values:

a. pH = 1.0 b. pH = 2.6 c. pH = 6.0 d. pH = 11.0

Identify the location and type of charge on the hexapeptide Lys-Ser-Asp-Cys-His-Tyr at each of the following pH values:

a. pH = 1 b. pH = 5 c. pH = 7 d. pH = 12

a. How many different octapeptides can be made from the 20 naturally occurring amino acids?

b. How many different proteins containing 100 amino acids can be made from the 20 naturally occurring amino acids?

a. Which isomer—(R)-alanine or (S)-alanine—is d-alanine?

b. Which isomer—(R)-aspartate or (S)-aspartate—is d-aspartate?

c. Can a general statement be made relating R and S to d and l?

Which would have the greatest percentage of polar amino acids, a spherical protein, a cigar-shaped protein, or a subunit of a hexamer? b. Which would have the smallest percentage of polar amino acids?
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