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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

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...

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 Structure

The Proteasome Structure

The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...

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...

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Related Experiment Video

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

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Protein targeting to ATP-dependent proteases.

Tomonao Inobe¹, Andreas Matouschek

¹Department of Biochemistry, Molecular Biology and Cell Biology, 2205 Tech Drive, Hogan 2-100 Northwestern University, Evanston, IL, USA.

Current Opinion in Structural Biology

|February 16, 2008

Summary

ATP-dependent proteases regulate cellular functions by degrading proteins. Specific routes deliver substrates to these proteases, involving distinct binding and degradation steps.

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Area of Science:

Cellular Biology
Molecular Biology
Biochemistry

Background:

ATP-dependent proteases are crucial for controlling cellular processes.
These proteases degrade specific regulatory proteins.
Protein substrates are targeted to proteases via distinct pathways.

Purpose of the Study:

To elucidate the mechanisms of protein substrate targeting to ATP-dependent proteases.
To differentiate between substrate binding and degradation initiation steps.

Main Methods:

Analysis of protein substrate transfer routes.
Investigation of parallel and independent targeting mechanisms.
Separation of substrate binding and degradation initiation.

Main Results:

Identified diverse routes for protein substrate delivery to ATP-dependent proteases.
Demonstrated that these routes can operate independently or in parallel.
Characterized the distinct steps of substrate binding and degradation initiation.

Conclusions:

Protein substrate targeting to ATP-dependent proteases is a multi-step process.
Understanding these targeting mechanisms is key to comprehending protease function.
Distinct pathways ensure specific protein degradation for cellular regulation.