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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

Consider the decapeptide angiotensin I.

  1. What products are formed when angiotensin I is treated with trypsin?
  2. What products are formed when angiotensin I is treated with chymotrypsin?
  1. Treatment of angiotensin I with ACE (the angiotensin-converting enzyme) cleaves only the amide bond with the carbonyl group derived from phenylalanine to afford two products.

The larger polypeptide is angiotensin II, a hormone that narrows blood vessels and increases blood pressure. Give the amino acid sequence of angiotensin II using threeletter abbreviations. ACE inhibitors are drugs that lower blood pressure by inhibiting the ACE enzyme (Problem 5.15).

Draw the amino acids and peptide fragments formed when the decapeptide A-P-F-L-K-W-S-G-R-G is treated with each reagent or enzyme: (a) chymotrypsin; (b) trypsin; (c) carboxypeptidase; (d)C6H5N=C=S

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?

Consider two molecules of a tetrapeptide composed of only alanine residues. Draw the hydrogen bonding interactions that result when these two peptides adopt a parallel ฮฒ-pleated sheet arrangement. Answer this same question for the antiparallel ฮฒ-pleated sheet arrangement.

Question: Identify the functional groups in each molecule. Classify each alcohol, alkyl halide, amide, and amine as 1ยฐ, 2ยฐ, or 3ยฐ

a.

b.

c.

d.

e.

f.

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