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Chapter 29: Q52. (page 1194)

Question: For the tetra peptide Asp鈥揂rg鈥揤al鈥揟yr:

a. Name the peptide using one-letter abbreviations.

b. Draw the structure.

c. Label all amide bonds.

d. Label the N-terminal and C-terminal amino acids

Short Answer

Expert verified

a.D-R-V-Y.

b.

c.

Step by step solution

01

Tetra peptide

Peptides with four amino acids linked by peptide bonds are said to be tetra peptide.The structure of tetra peptide can be linear as well as cyclic

02

Abbreviation

a. The one-letter abbreviation of Asp-Arg-Val-Tyr is D-R-V-Y.

03

Structure

b. The structure of Asp-Arg-Val-Tyr

04

Amide bonds

c. The bond that forms between amino acid and carboxyl group of other amino acid is said to be amide bonds.

05

N-terminal and C-terminal

d. N-terminal and C-terminal are those amino acids that are free from the amine and carboxyl group. They are always located at the left and right end of the chain respectively.

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Most popular questions from this chapter

Use the given experimental data to deduce the sequence of an octapeptide that contains the following amino acids: Ala, Gly (2 equiv), His (2 equiv), Ile, Leu and Phe. Edman degradation cleaves Gly from the octapeptide, and carboxypeptidase forms Leu and a heptapeptide. Partial hydrolysis forms the following fragments: Ile-His-Leu, Gly, Gly-Ala-Phe-His, and Phe-His-Ile.

(a) What products are formed when each peptide is treated with trypsin? (b) What products are formed when each peptide is treated with chymotrypsin?

[1] Gly鈥揂la鈥揚he鈥揕eu鈥揕ys鈥揂la

[2] Phe鈥揟yr鈥揋ly鈥揅ys鈥揂rg鈥揝er

[3] Thr鈥揚ro鈥揕ys鈥揋lu鈥揌is鈥揋ly鈥揚he鈥揅ys鈥揟rp鈥揤al鈥揤al鈥揚he

Draw the structure for each peptide:

(a) Phe鈥揂la;

(b) Gly鈥揋ln;

(c) Lys鈥揋ly;

(d) R-H

Deduce the sequence of a heptapeptide that contains the amino acids Ala, Arg, Glu, Gly, Leu, Phe, and Ser, from the following experimental data. Edman degradation cleaves Leu from the heptapeptide, and carboxypeptidase forms Glu and a hexapeptide. Treatment of the heptapeptide with chymotrypsin forms a hexapeptide and a single amino acid. Treatment of the heptapeptide with trypsin forms a pentapeptide and a dipeptide. Partial hydrolysis forms Glu, Leu, Phe, and the tripeptidesGly鈥揂la鈥揝er and Ala鈥揝er鈥揂rg

Tryptophan is not classified as a basic amino acid even though it has a heterocycle containing a nitrogen atom. Why is the N atom in the five-membered ring of tryptophan not readily protonated by acid?
See all solutions

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