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Chapter 29: 14P (page 1166)

Draw the structure of each peptide. Label the N-terminal and C-terminal amino acids and all amide bonds.

a. Val鈥揋lu

b. Gly鈥揌is鈥揕eu

c. M鈥揂鈥揟鈥揟

Short Answer

Expert verified

c.

Step by step solution

01

Peptide

When amino acid binds together by amide bonds, a large molecule is formed called peptide. Peptides are used as dietary supplements, to stimulate skin, and provide proteins required to the skin.

02

N-terminal and C-terminal

N-terminal amino acid are those amino acid which are free from amine group and C-terminal amino acid are those which are free from carboxyl group. N-terminal amino acid is written on the left end of the chain and C-terminal amino acid on the right.

03

Structures

a. The structure of Val-Glu peptide is drawn by joining adjacent and groups in amide bonds.

b. The structure of Gly-His-Leupeptide is drawn by joining adjacent and groups in amide bonds.

c. The structure of M-A-T-T peptide is drawn by joining adjacent and groups in amide bonds.

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Most popular questions from this chapter

Name each peptide using both the three-letter and one-letter abbreviations of the component amino acids.

a.

b.

The anti-obesity drug orlistat works by irreversibly inhibiting pancreatic lipase, an enzyme responsible for the hydrolysis of triacylglycerols in the intestines, so they are excreted without metabolism, inhibition occurs by reaction of orlistat with a serine residue of the enzyme, forming a covalently bound, inactive enzyme product. Draw the structure of the product formed during inhibition.

Draw the organic products formed in each reaction.

a.

b.

c.

d.

e.

f.

Give the amino acid sequence of an octapeptide that contains the amino acids Tyr, Ala, Leu (2 equiv), Cys, Gly, Glu and Val, and forms the following fragments when partially hydrolyzed with HCl: Val-Cys-Gly-Glu, Ala-Leu-Tyr, and Tyr-Leu-Val-Cys.

Which of the following amines can be used to resolve a racemic mixture of amino acids?

(a)

(b)

(c)

(d)
See all solutions

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