Which of these dipeptides are hydrolyzed by trypsin? by chymotrypsin? Q.) Phe-Gly-Lys

Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter22: Proteins
Section: Chapter Questions
Problem 22.48P: 22-48 How many amino acid residues in the A chain of insulin are the same in insulin from humans,...
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Which of these dipeptides are hydrolyzed by trypsin? by chymotrypsin?

Q.) Phe-Gly-Lys

Expert Solution
Step 1

Given dipeptide:

Phen- Gly - Lys

Step 2

The given dipeptides contain 

  • Phenylalanine
  • Glycine 
  • Lysine

The structure of Phenylalanine is 

Chemistry homework question answer, step 2, image 1

The structure of glycine is

Chemistry homework question answer, step 2, image 2

The structure of lysine

Chemistry homework question answer, step 2, image 3

 

Step 3

Trypsin is an enzyme which cuts the dipeptide from C-terminal of basic amino acid. For example: lysine , arginine etc

Chymotrypsin is an enzyme which cuts the dipeptide from C-terminal of amino acid having aromatic side chain. For example: phenyl alanine, tyrosine, tryptophan etc

Chemistry homework question answer, step 3, image 1

Phen - Gly - Lys

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