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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

Draw the structure of leu-enkephalin, a pentapeptide that acts as an analgesic and opiate, and has the following sequence: Tyr鈥揋ly鈥揋ly鈥揚he鈥揕eu. (The structure of a related peptide, met-enkephalin,

appeared in Section 22.6B.)

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?

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

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

Which of the following amino acids are typically found in the interior of a globular protein, and which are typically found on the surface: (a)phenylalanine; (b)aspartic acid; (c) lysine; (d) isoleucine; (e) arginine; (f) glutamic acid?
See all solutions

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