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Related Concept Videos

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.
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Protein Networks02:26

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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The Proteasome02:18

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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.
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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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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Updated: Mar 6, 2026

The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes
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The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes

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Determining Protease Substrates Within a Complex Protein Background Using the PROtein TOpography and Migration

R A Fuhrman-Luck1,2, L M Silva2,3, M L Hastie4

  • 1Australian Prostate Cancer Research Centre-Queensland, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|March 19, 2017
PubMed
Summary
This summary is machine-generated.

The PROtein TOpography and Migration Analysis Platform (PROTOMAP) identifies protease substrates in complex samples. This degradomics technique uses gel electrophoresis and mass spectrometry to reveal protein cleavage sites.

Keywords:
DegradomicsPROTOMAPPROtein TOpography and Migration Analysis PlatformProteaseProteolysisProteomicsSubstrate

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Identification of Kinase-substrate Pairs Using High Throughput Screening
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Area of Science:

  • Biochemistry
  • Proteomics
  • Molecular Biology

Background:

  • Protease activity is crucial in biological processes.
  • Identifying protease substrates is essential for understanding cellular functions.
  • Existing methods for substrate identification can be complex and limited.

Purpose of the Study:

  • To introduce and validate the PROtein TOpography and Migration Analysis Platform (PROTOMAP) for identifying protease substrates.
  • To demonstrate the utility of PROTOMAP in complex biological systems.

Main Methods:

  • PROTOMAP utilizes sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) for protein separation based on relative mobility.
  • Gel lanes are sectioned, followed by in-gel trypsin digestion.
  • Peptides and proteins are identified using liquid chromatography-tandem mass spectrometry (LC-MS/MS) and bioinformatics.
  • A peptograph is generated in silico to visualize protein migration patterns.

Main Results:

  • Proteins migrating further in protease-treated lanes compared to controls are identified as putative substrates.
  • The peptograph visually represents SDS-PAGE migration, aiding substrate identification.
  • PROTOMAP successfully identified protease substrates in complex protein mixtures.

Conclusions:

  • PROTOMAP is a robust and versatile degradomics technique for protease substrate identification.
  • The method offers broad applicability across various experimental conditions and protein pools.
  • PROTOMAP provides a valuable tool for studying protease activity in complex biological systems.