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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 Proteasome Structure01:17

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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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The Proteasome01:13

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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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Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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The utility of proteases in proteomics, from sequence profiling to structure and function analysis.

Binwen Sun1,2,3, Zheyi Liu2, Jin Liu1,3,4

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Proteomics
|November 16, 2022
PubMed
Summary

Protease selection is crucial for comprehensive proteome analysis in mass spectrometry. Complementary proteases enhance protein sequence and post-translational modification coverage beyond trypsin limitations.

Keywords:
bottom-up proteomicspost-translational modificationproteolysissequence profilingstructural proteomics

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Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Bottom-up proteomics relies on protease digestion for peptide generation.
  • Trypsin is standard but misses cleavage sites, limiting proteome coverage.
  • Complementary proteases improve sequence and PTM identification.

Purpose of the Study:

  • Review common and novel proteases in proteomics.
  • Highlight cleavage features and applications.
  • Discuss future protease development.

Main Methods:

  • Survey of proteases used in proteomics (last 5 years).
  • Focus on cleavage specificities.
  • Analysis of applications in protein characterization and PTM discovery.

Main Results:

  • Identified key proteases complementing trypsin.
  • Detailed unique cleavage sites and applications.
  • Summarized use in structural proteomics and protein function.

Conclusions:

  • Proteases beyond trypsin are vital for deep proteome coverage.
  • Emerging proteases offer new possibilities for PTM and protein analysis.
  • Future research should focus on novel protease development and applications.