Cut the following protein with the Serine Proteolytic enzyme Trypsin. How many peptide fragments are present after the protein is treated with Trypsin? Ala-Leu-Arg-Gly-Met-Val-Arg-Lys-Ala O 2 9,

Biochemistry
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ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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### Protein Fragmentation by Trypsin

**Question:**
Cut the following protein with the Serine Proteolytic enzyme *Trypsin*. How many peptide fragments are present after the protein is treated with *Trypsin*?

**Given Sequence:**
Ala-Leu-Arg-Gly-Met-Val-Arg-Lys-Ala

**Options:**
- O 2
- O 9
- O 8
- O 4

**Explanation:**
Trypsin is a serine protease that specifically cleaves peptide chains primarily at the carboxyl side of the amino acids lysine (Lys) and arginine (Arg), except when either is followed by proline.

**Analysis of the Given Sequence:**
- Sequence: Ala-Leu-Arg-Gly-Met-Val-Arg-Lys-Ala

Cleavage points:
1. After the first "Arg" (Arginine)
2. After the second "Arg" (Arginine)
3. After the "Lys" (Lysine)

This results in the following fragments:
1. Ala-Leu-Arg
2. Gly-Met-Val-Arg
3. Lys
4. Ala

**Answer: 4 Peptide Fragments**

When the given protein sequence is treated with the enzyme Trypsin, a total of four peptide fragments (Ala-Leu-Arg, Gly-Met-Val-Arg, Lys, and Ala) are formed. Therefore, the correct option is:
- O 4

This example illustrates how cleavage sites in a protein sequence can be identified using specific enzymes, aiding in understanding the structure and function of proteins in biological processes.
Transcribed Image Text:### Protein Fragmentation by Trypsin **Question:** Cut the following protein with the Serine Proteolytic enzyme *Trypsin*. How many peptide fragments are present after the protein is treated with *Trypsin*? **Given Sequence:** Ala-Leu-Arg-Gly-Met-Val-Arg-Lys-Ala **Options:** - O 2 - O 9 - O 8 - O 4 **Explanation:** Trypsin is a serine protease that specifically cleaves peptide chains primarily at the carboxyl side of the amino acids lysine (Lys) and arginine (Arg), except when either is followed by proline. **Analysis of the Given Sequence:** - Sequence: Ala-Leu-Arg-Gly-Met-Val-Arg-Lys-Ala Cleavage points: 1. After the first "Arg" (Arginine) 2. After the second "Arg" (Arginine) 3. After the "Lys" (Lysine) This results in the following fragments: 1. Ala-Leu-Arg 2. Gly-Met-Val-Arg 3. Lys 4. Ala **Answer: 4 Peptide Fragments** When the given protein sequence is treated with the enzyme Trypsin, a total of four peptide fragments (Ala-Leu-Arg, Gly-Met-Val-Arg, Lys, and Ala) are formed. Therefore, the correct option is: - O 4 This example illustrates how cleavage sites in a protein sequence can be identified using specific enzymes, aiding in understanding the structure and function of proteins in biological processes.
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