I’m reviewing Enzyme Inhibition and am having issues wrapping my head around non-competitive and uncompetitive inhibition (and their consequent effect on Vmax / Km.)
I’m reviewing Enzyme Inhibition and am having issues wrapping my head around non-competitive and uncompetitive inhibition (and their consequent effect on Vmax / Km.)
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
Related questions
Question
I’m reviewing Enzyme Inhibition and am having issues wrapping my head around non-competitive and uncompetitive inhibition (and their consequent effect on Vmax / Km.)
![## Enzyme Inhibition Overview
### Graph: Enzyme Inhibition Types
**Graph Explanation:**
- The graph illustrates different types of enzyme inhibition by showing reaction velocity (V) against substrate concentration ([S]).
- **Uninhibited Reaction:** The black curve represents an uninhibited enzyme reaction, reaching a maximum velocity (Vmax). The substrate concentration at half the maximum velocity is denoted as Km.
- **Competitive Inhibition (Red Curve):** This curve shows an increase in Km with no change in Vmax, indicating the need for higher substrate concentration to reach the same velocity.
- **Non-Competitive Inhibition (Green Curve):** Here, Vmax is decreased while Km remains the same. This indicates that the inhibitor impacts Vmax but does not affect substrate binding.
- **Uncompetitive Inhibition (Purple Curve):** Both Vmax and Km are decreased. This reflects the binding of inhibitor only after the substrate is bound.
### Types of Enzyme Inhibition
1. **Competitive Inhibition**
- **Binding Site:** Active site.
- **Effect on Vmax:** Remains the same.
- **Effect on Km:** Increases.
- **Notes:** Inhibition can be overcome by increasing substrate concentration.
2. **Non-Competitive Inhibition**
- **Binding Site:** Allosteric site.
- **Effect on Vmax:** Decreases.
- **Effect on Km:** Remains the same.
- **Notes:** Does not affect substrate binding; it turns the enzyme off.
3. **Uncompetitive Inhibition**
- **Binding Site:** Allosteric site at enzyme-substrate (E-S) complex.
- **Effect on Vmax:** Decreases.
- **Effect on Km:** Decreases.
- **Notes:** Binds after the substrate, locking E-S together and preventing product formation.
4. **Mixed Inhibition**
- **Binding Site:** Allosteric site on enzyme or E-S complex.
- **Effect on Vmax:** Decreases.
- **Effect on Km:** Variable (unknown).
### Important Concepts
- **Km and Vmax:** Key indicators used to understand enzyme activity under different inhibitory conditions.
- **Allosteric Sites:** Alternative binding sites on the enzyme that affect enzyme activity without competing with the substrate at the active site.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3156f54e-76f9-4d5b-8710-407aa8c3b44d%2Fa64e825c-fcd1-4539-8f4b-7235656b4435%2Fmuz94ms_processed.jpeg&w=3840&q=75)
Transcribed Image Text:## Enzyme Inhibition Overview
### Graph: Enzyme Inhibition Types
**Graph Explanation:**
- The graph illustrates different types of enzyme inhibition by showing reaction velocity (V) against substrate concentration ([S]).
- **Uninhibited Reaction:** The black curve represents an uninhibited enzyme reaction, reaching a maximum velocity (Vmax). The substrate concentration at half the maximum velocity is denoted as Km.
- **Competitive Inhibition (Red Curve):** This curve shows an increase in Km with no change in Vmax, indicating the need for higher substrate concentration to reach the same velocity.
- **Non-Competitive Inhibition (Green Curve):** Here, Vmax is decreased while Km remains the same. This indicates that the inhibitor impacts Vmax but does not affect substrate binding.
- **Uncompetitive Inhibition (Purple Curve):** Both Vmax and Km are decreased. This reflects the binding of inhibitor only after the substrate is bound.
### Types of Enzyme Inhibition
1. **Competitive Inhibition**
- **Binding Site:** Active site.
- **Effect on Vmax:** Remains the same.
- **Effect on Km:** Increases.
- **Notes:** Inhibition can be overcome by increasing substrate concentration.
2. **Non-Competitive Inhibition**
- **Binding Site:** Allosteric site.
- **Effect on Vmax:** Decreases.
- **Effect on Km:** Remains the same.
- **Notes:** Does not affect substrate binding; it turns the enzyme off.
3. **Uncompetitive Inhibition**
- **Binding Site:** Allosteric site at enzyme-substrate (E-S) complex.
- **Effect on Vmax:** Decreases.
- **Effect on Km:** Decreases.
- **Notes:** Binds after the substrate, locking E-S together and preventing product formation.
4. **Mixed Inhibition**
- **Binding Site:** Allosteric site on enzyme or E-S complex.
- **Effect on Vmax:** Decreases.
- **Effect on Km:** Variable (unknown).
### Important Concepts
- **Km and Vmax:** Key indicators used to understand enzyme activity under different inhibitory conditions.
- **Allosteric Sites:** Alternative binding sites on the enzyme that affect enzyme activity without competing with the substrate at the active site.
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps

Recommended textbooks for you

Biochemistry
Biochemistry
ISBN:
9781319114671
Author:
Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:
W. H. Freeman

Lehninger Principles of Biochemistry
Biochemistry
ISBN:
9781464126116
Author:
David L. Nelson, Michael M. Cox
Publisher:
W. H. Freeman

Fundamentals of Biochemistry: Life at the Molecul…
Biochemistry
ISBN:
9781118918401
Author:
Donald Voet, Judith G. Voet, Charlotte W. Pratt
Publisher:
WILEY

Biochemistry
Biochemistry
ISBN:
9781319114671
Author:
Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:
W. H. Freeman

Lehninger Principles of Biochemistry
Biochemistry
ISBN:
9781464126116
Author:
David L. Nelson, Michael M. Cox
Publisher:
W. H. Freeman

Fundamentals of Biochemistry: Life at the Molecul…
Biochemistry
ISBN:
9781118918401
Author:
Donald Voet, Judith G. Voet, Charlotte W. Pratt
Publisher:
WILEY

Biochemistry
Biochemistry
ISBN:
9781305961135
Author:
Mary K. Campbell, Shawn O. Farrell, Owen M. McDougal
Publisher:
Cengage Learning

Biochemistry
Biochemistry
ISBN:
9781305577206
Author:
Reginald H. Garrett, Charles M. Grisham
Publisher:
Cengage Learning

Fundamentals of General, Organic, and Biological …
Biochemistry
ISBN:
9780134015187
Author:
John E. McMurry, David S. Ballantine, Carl A. Hoeger, Virginia E. Peterson
Publisher:
PEARSON