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Regulated Protein Degradation

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...

Regulated Protein Degradation

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...

The Proteasome

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...

The Proteasome

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Feedback Inhibition

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Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!

Enzyme Inhibition

Enzyme Inhibition

Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.

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Related Experiment Video

Updated: May 22, 2026

High-Throughput Cellular Profiling of Targeted Protein Degradation Compounds Using HiBiT CRISPR Cell Lines

High-Throughput Cellular Profiling of Targeted Protein Degradation Compounds Using HiBiT CRISPR Cell Lines

Published on: November 9, 2020

Inhibitor mediated protein degradation.

Marcus J C Long¹, Deviprasad R Gollapalli, Lizbeth Hedstrom

¹Graduate Program in Biochemistry, Brandeis University, 415 South Street, Waltham, MA 02453, USA.

Chemistry & Biology

|May 29, 2012

Summary

Researchers developed a new strategy using the tert-butyl carbamate-protected arginine (Boc(3)Arg) moiety to design inhibitors that induce targeted protein degradation. This approach offers a general method for creating potent degradation-inducing drugs.

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High-Throughput Cellular Profiling of Targeted Protein Degradation Compounds Using HiBiT CRISPR Cell Lines

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Cycloheximide Chase Analysis of Protein Degradation in Saccharomyces cerevisiae

Cycloheximide Chase Analysis of Protein Degradation in Saccharomyces cerevisiae

Published on: April 18, 2016

Area of Science:

Drug Discovery
Molecular Biology
Proteomics

Background:

Targeted protein degradation is a key mechanism in cellular regulation.
Current methods for discovering degradation-inducing drugs often rely on serendipity.
Developing general strategies for targeted protein degradation is crucial for therapeutic advancement.

Purpose of the Study:

To introduce a novel moiety, tert-butyl carbamate-protected arginine (Boc(3)Arg), as a general strategy for designing protein degradation-inducing inhibitors.
To demonstrate the efficacy of Boc(3)Arg in inducing degradation of specific target proteins.

Main Methods:

Conjugation of the Boc(3)Arg moiety to known covalent and noncovalent inhibitors.
Treatment of cells with Boc(3)Arg-linked inhibitors.
Quantification of target protein degradation using proteasome-dependent pathways.

Main Results:

Boc(3)Arg successfully induced specific degradation of glutathione-S-transferase and dihydrofolate reductase.
Degradation was rapid and robust, with 30%-80% of target proteins degraded within 1.3-5 hours.
The proteasome was essential for Boc(3)Arg-mediated degradation, independent of ATP and ubiquitin pathways.

Conclusions:

The Boc(3)Arg moiety represents a general and effective strategy for designing inhibitors that induce targeted protein degradation.
This approach facilitates the development of novel therapeutic agents by enabling controlled protein depletion.
The findings open new avenues for drug discovery focused on proteasomal degradation pathways.