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Related Concept Videos

Proteomics01:33

Proteomics

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 proteomics...

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Related Experiment Video

Updated: Jul 6, 2026

Deep Proteome Profiling by Isobaric Labeling, Extensive Liquid Chromatography, Mass Spectrometry, and Software-assisted Quantification
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Immunological methods to quantify and characterize proteasome complexes: development and application.

Matthias Majetschak1, Luis T Sorell

  • 1DeWitt Daughtry Family Department of Surgery, Division of Trauma and Surgical Critical Care-Trauma Research, University of Miami Miller School of Medicine, Miami, FL 33136, USA. mmajetschak@med.miami.edu

Journal of Immunological Methods
|March 18, 2008
PubMed
Summary

New ELISAs quantify proteasomes (20S and 26S) in cell extracts. These assays reveal distinct proteasome distributions in blood cells and aid in understanding proteasome roles in health and disease.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • The ubiquitin-proteasome pathway is crucial for cellular functions and disease.
  • Quantifying proteasome subtypes (20S and 26S) in crude cell extracts has been challenging.
  • Understanding the ratio of free 20S core particles to 26S proteasomes is vital.

Purpose of the Study:

  • To develop novel ELISAs for quantifying 20S and 26S proteasomes.
  • To investigate the distribution and physiological relevance of 20S and 26S proteasomes in different cell types.
  • To explore the role of ATP in 26S proteasome stability and function.

Main Methods:

  • Development of specific 20S and 26S proteasome ELISAs.
  • Utilizing ATP/Mg2+ requirement for 26S proteasome stability in assay design.
  • Application of Solid Phase Affinity Immobilization (SPAI) for 26S proteasome dissociation studies.

Main Results:

  • Established ELISAs with low intra- and inter-assay variations and high recovery rates.
  • Demonstrated distinct proteasome distributions: 26S predominant in PBMNCs, free 20S in erythrocytes.
  • Identified ATP binding (both hydrolyzable and non-hydrolyzable forms) as essential for 26S proteasome stabilization.

Conclusions:

  • The developed ELISAs provide reliable tools for proteasome quantification in biological samples.
  • These assays facilitate the study of proteasome dynamics and their roles in health and disease.
  • Findings shed light on the mechanisms stabilizing the 26S proteasome.