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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...

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 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...

Export of Misfolded Proteins out of the ER

Export of Misfolded Proteins out of the ER

After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...

Proteins: From Genes to Degradation

Proteins: From Genes to Degradation

Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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mRNA Stability and Gene Expression

mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability

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Related Experiment Video

Updated: Jun 8, 2025

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

Next steps for targeted protein degradation.

Mackenzie W Krone¹, Craig M Crews²

¹Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06511, USA.

Cell Chemical Biology

|November 5, 2024

Summary

This summary is machine-generated.

Targeted protein degradation (TPD) is a promising therapeutic strategy, with new molecular degraders nearing clinical approval. Further advancements in TPD platforms, synthesis, and complex optimization are needed to expand its medical applications.

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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:

Biochemistry
Pharmacology
Medicinal Chemistry

Background:

Targeted protein degradation (TPD) has emerged as a powerful therapeutic strategy over the last two decades.
Chemical methods for regulating biomolecular proximity offer advantages over traditional protein inhibition, enabling targeting of previously undruggable disease-related proteins.

Purpose of the Study:

To highlight key areas for future growth in the field of TPD.
To identify strategies for developing the next generation of molecular degraders.
To underscore the potential of TPD in expanding therapeutic applications.

Main Methods:

Review and synthesis of current advancements in TPD.
Identification of critical areas requiring further research and development.
Focus on spatiotemporal precision, synthesis throughput, and complex cooperativity.

Main Results:

TPD offers pharmacological advantages for targeting undruggable proteins.
Pre-clinical success and existing clinical therapies demonstrate TPD's potential.
Three priority areas for TPD toolbox expansion have been identified.

Conclusions:

Continued innovation in TPD platforms, synthesis, and induced protein complex optimization is crucial.
Advancements in these areas will broaden the therapeutic applications of proximity-induced pharmacology.
The future of TPD in medicine is promising, with potential for significant clinical impact.