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Chapter 29: Q53P (page 1194)

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

a.

b.

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

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


Peptide (G-D-E)

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


Peptide (A-G-R)

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Most popular questions from this chapter

Devise a synthesis of each peptide from amino acid starting materials:

(a) Leu鈥揤al; (b) Ala鈥揑le鈥揋ly.

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.)

a. Draw the structure of the tripeptide A-A-A, and label the two ionizable functional groups.

b. What is the predominant form of A-A-A at pH=1?

c. The values for the two ionizable functional groups (3.39 and 8.03) differ considerably from the values of alanine (2.35 and 9.87;see table 29.1). Account for the observed differences.

What is the structure of each amino acid at its isoelectric point: (a) alanine (b) methionine; (c)aspartic acid; (d) lysine?

The fibroin proteins found in silk fibers consist of large regions of 尾-pleated sheets stacked one on top of another. (a) Explain why having a glycine at every other residue allows the 尾-pleated sheets to stack on top of each other. (b) Why are silk fibers insoluble in water?
See all solutions

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