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Related Concept Videos

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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.
These groups modify specific amino acids in a protein.

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Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry
11:54

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Published on: March 23, 2020

Deciphering tissue-specific ubiquitylation by mass spectrometry.

Ugo Mayor1, Junmin Peng

  • 1Ikerbasque, Basque Foundation for Science, Bilbao, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|February 22, 2012
PubMed
Summary

Protein ubiquitylation regulates key cellular events and its function depends on ubiquitin chain structure. New mass spectrometry methods allow detailed analysis of these ubiquitin chains in various samples, including human tissues.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Protein ubiquitylation is a fundamental post-translational modification regulating diverse cellular processes in eukaryotes.
  • The functional outcome of ubiquitylation is determined by the specific ubiquitin (Ub) chain topology and linkage type.
  • Ubiquitin chain linkages include K6, K11, K27, K29, K33, K48, and K63, in addition to monoubiquitination.

Purpose of the Study:

  • To present technological advancements for analyzing tissue-specific ubiquitin conjugates.
  • To describe targeted proteomics methods for quantifying various polyubiquitin chain linkages.
  • To provide an updated overview of ubiquitin analysis in research.

Main Methods:

  • Ubiquitin-enrichment strategies coupled with sensitive mass spectrometry.
  • Analysis of tissue-specific ubiquitin conjugates in transgenic models.
  • Targeted proteomics for quantifying different polyubiquitin chain linkages.

Main Results:

  • Enables direct analysis of ubiquitylated proteins in cells.
  • Provides tools for analyzing tissue-specific ubiquitin conjugates.
  • Facilitates quantification of diverse polyubiquitin chain linkages in various sample types.

Conclusions:

  • Advanced mass spectrometry techniques offer powerful tools for ubiquitin research.
  • These methods allow detailed characterization of ubiquitylation in complex biological systems.
  • The described technologies are applicable to human tissues and transgenic models for comprehensive ubiquitin analysis.