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Chapter 29: Q53. (page 1194)

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

Short Answer

Expert verified

1.Gly-Asp-Glu and G-D-E.

2.Ala-Gly-Arg and A-G-R.

Step by step solution

01

Amino Acids

Amino acids containan amino group and carboxylate anion in their structure. When they bond together, it results in the formation of proteins.Peptides are formed by connecting amino acids with peptide bonds.

02

Naming of the peptide using three-letter and one-letter abbreviations

1.The three-letter word for this peptide is Gly-Asp-Glu, and the one-letter word is G-D-E.


1.The three-letter word for this peptide is Ala-Gly-Arg, and the one-letter word is A-G-R.


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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.

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

Histidine is classified as a basic amino acid because one of the N atoms in its five-membered ring is readily protonated by acid. Which N atom in histidine is protonated and why?

(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

Glutathione, a powerful antioxidant that destroys harmful oxidizing agents in cells, is composed of glutamic acid, cysteine, and glycine, and has the following structure:

Glutathione

a. What product is formed when glutathione reacts with an oxidizing agent?

b. What is unusual about the peptide bond between glutamic acid and cysteine?
See all solutions

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