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Related Concept Videos

Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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The Proteasome01:13

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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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Regulated Protein Degradation02:58

Regulated Protein Degradation

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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.
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The Proteasome Structure01:17

The Proteasome Structure

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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...
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Related Experiment Video

Updated: Aug 1, 2025

Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations
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Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations

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Proteomic approaches to study ubiquitinomics.

Indrajit Sahu1, He Zhu1, Sara J Buhrlage2

  • 1Department of Cancer Biology and the Linde Program in Cancer Chemical Biology, Dana-Farber Cancer Institute, Boston, MA, USA.

Biochimica Et Biophysica Acta. Gene Regulatory Mechanisms
|April 30, 2023
PubMed
Summary

Protein ubiquitination, once thought to mark proteins for degradation, is now known to be a dynamic signaling process crucial in cell biology and human disease. Mass spectrometry offers powerful proteomic methods for its study.

Keywords:
KεGGMass-spectrometryMiddle-downProteomicsUbiquitindiGly peptides

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Proteomics

Background:

  • Protein ubiquitination was initially considered a static degradation signal.
  • It is now recognized as a dynamic, structurally diverse post-translational modification vital for eukaryotic cell signaling.
  • Dysregulation of ubiquitin signaling is implicated in human diseases.

Purpose of the Study:

  • To review and compare qualitative and quantitative proteomic methods for studying protein ubiquitination.
  • To highlight the strengths and weaknesses of mass spectrometry-based approaches in ubiquitination research.

Main Methods:

  • Detailed qualitative proteomic methods.
  • Detailed quantitative proteomic methods.
  • Comparative analysis of mass spectrometry techniques for ubiquitination detection and characterization.

Main Results:

  • Mass spectrometry has become a key technology for protein ubiquitination analysis.
  • The study provides a compare/contrast overview of various proteomic methods.
  • Strengths and limitations of different approaches are discussed.

Conclusions:

  • Protein ubiquitination is a complex and dynamic modification central to cell function and disease.
  • Mass spectrometry-based proteomics is essential for advancing ubiquitination research.
  • Understanding these methods is critical for biomedical and clinical applications.