Question:
The 14-3-3 proteins are involved in the post-translational regulation of which one of the following enzymes of nitrogen metabolism?
The 14-3-3 proteins are involved in the post-translational regulation of which one of the following enzymes of nitrogen metabolism?
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14-3-3 proteins:
- Regulate nitrate reductase activity.
- Bind to phosphorylated nitrate reductase and inactivate it.
- Post-translational regulation mechanism.
- Regulate nitrate reductase activity.
- Bind to phosphorylated nitrate reductase and inactivate it.
- Post-translational regulation mechanism.
Updated On: Sep 1, 2026
- Nitrite reductase
- Nitrate reductase
- Nitrogenase
- Glutamine synthetase
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of post-translational regulation in plants.
Step 2: Detailed Explanation:
14-3-3 proteins regulate nitrate reductase in plants.
Nitrate reductase is the first enzyme in the nitrate assimilation pathway.
14-3-3 proteins bind to phosphorylated nitrate reductase and inactivate it.
This provides a rapid mechanism for regulating nitrate assimilation.
Nitrite reductase (A): Not regulated by 14-3-3 proteins.
Nitrogenase (C): Not regulated by 14-3-3 proteins.
Glutamine synthetase (D): Not regulated by 14-3-3 proteins.
Thus, 14-3-3 proteins regulate nitrate reductase.
Step 3: Final Answer:
Thus, 14-3-3 proteins are involved in the regulation of nitrate reductase, which corresponds to option (B).
[0.5cm]
This question tests knowledge of post-translational regulation in plants.
Step 2: Detailed Explanation:
14-3-3 proteins regulate nitrate reductase in plants.
Nitrate reductase is the first enzyme in the nitrate assimilation pathway.
14-3-3 proteins bind to phosphorylated nitrate reductase and inactivate it.
This provides a rapid mechanism for regulating nitrate assimilation.
Nitrite reductase (A): Not regulated by 14-3-3 proteins.
Nitrogenase (C): Not regulated by 14-3-3 proteins.
Glutamine synthetase (D): Not regulated by 14-3-3 proteins.
Thus, 14-3-3 proteins regulate nitrate reductase.
Step 3: Final Answer:
Thus, 14-3-3 proteins are involved in the regulation of nitrate reductase, which corresponds to option (B).
[0.5cm]
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