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Related Concept Videos

Immunoprecipitation01:20

Immunoprecipitation

Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...

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Related Experiment Video

Updated: May 28, 2026

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

An affinity purification procedure to isolate oxidized p53.

Jenna Scotcher1, David J Clarke, Pat R R Langridge-Smith

  • 1SIRCAMS, School of Chemistry, University of Edinburgh, Edinburgh EH9 3JJ, UK.

Analytical Biochemistry
|October 4, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to separate oxidized and reduced forms of proteins, like the tumor suppressor protein p53. This technique uses biotin labeling and the biotin-avidin interaction to purify specific protein oxidation states for study.

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Last Updated: May 28, 2026

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Chemistry

Background:

  • Cysteine oxidation is a key regulatory mechanism controlling protein function and activity.
  • Many redox-regulated proteins exist as heterogeneous mixtures of reduced and oxidized forms, posing purification challenges.
  • Chromatographic methods often fail to separate these distinct redox states.

Purpose of the Study:

  • To develop a novel protocol for the separation of reduced and oxidized forms of the tumor suppressor protein p53.
  • To enable the purification and study of specific protein oxidation states.
  • To provide a method applicable to other cysteine-containing proteins requiring enrichment of oxidized forms.

Main Methods:

  • Utilized reversible thiol group labeling with biotin.
  • Exploited the high-affinity biotin-avidin interaction for separation.
  • Developed a purification protocol for the tumor suppressor protein p53 redox forms.

Main Results:

  • Successfully separated reduced and oxidized forms of the tumor suppressor protein p53.
  • Demonstrated a method for purifying specific protein oxidation states.
  • Established a protocol adaptable for other cysteine-containing proteins.

Conclusions:

  • A robust method for separating protein redox states based on reversible biotinylation has been established.
  • This technique facilitates the study of proteins with heterogeneous oxidation patterns, such as p53.
  • The protocol offers a valuable tool for researchers investigating protein redox regulation and function.