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

Backbone of a peptide

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Most popular questions from this chapter

In what order would histidine, serine, aspartate, and valine be eluted with a buffer of pH 4 from a columncontaining an anion-exchange resin (Dowex 1)?

Explain why the pI of lysine is the average of the pKa values of its two protonated amino groups.

What dipeptides would be formed by heating a mixture of valine and N- protected leucine?

Draw the product obtained when a lysine side chain in a polypeptide reacts with maleic anhydride.

Why are the carboxylic acid groups of the amino acids more acidic

(pKa ~ 2) than a carboxylic acid such as acetic acid (pKa = 4.76)?
See all solutions

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