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Chapter 24: Q1P (page 1262)

Draw three-dimensional representation of the following amino acids:

(a) L-alanine

(b) L-Leucine

(c) D-serine

(d) D-glutamine

Short Answer

Expert verified

(a), (b), (c) and (d) The diagrams are drawn below

Step by step solution

01

3D representation of organic compounds: 

Solid wedge:The bond that protrudes out of the plane of paper towards the viewer.

Dashed wedge: The bond that project away from the viewer or into the plane of the paper.

The bond in the plane of the paper is represented by a line.

02

Step 2(a) : 3-D representation of L-alanine:

L-Alanine

03

Step 3(b): 3-D representation of L-Leucine:

L-Leucine

04

Step 4(c): 3-D representation of D-Serine:

D-Serine

05

Step 5(d): 3-D representation of D-Glutamine:

D-Glutamine

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Most popular questions from this chapter

Show the third and fourth steps in the sequencing of oxytocin. Use figure 24-14 as a guide.

Show the steps and intermediates in the synthesis of Leu-Ala-Phe by the solid-phase process.

Lipoic acid is often found near the active sites of enzymes, usually bound to the peptide by a long, flexible amide linkage with a lysine residue.

(a) Is lipoic acid a mild oxidizing agent or a mild reducing agent? Draw it in both its oxidized and reduced forms.

(b) Show how lipoic acid might react with two Cys residues to form a disulfide bridge.

(c) Give a balanced equation for the hypothetical oxidation or reduction, as you predicted in part (a), of an aldehyde by lipoic acid.

The following structure is drawn in an unconventional manner.

(a) Label the N terminus and the C terminus.

(b) Label the peptide bonds.

(c) Identify and label each amino acid present.

(d) Give the full name and the abbreviated name

There are many methods for activating a carboxylic acid in preparation for coupling with an amine. The following method converts the acid to an N-hydroxysuccinimide (NHS) ester.

(a) Explain why an NHS ester is much more reactive than a simple alkyl ester.

(b) Propose a mechanism for the reaction shown.

(c) Propose a mechanism for the reaction of the NHS ester with an amine, R-NH2
See all solutions

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