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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

MultiDsk: a ubiquitin-specific affinity resin.

Marcus D Wilson1, Marco Saponaro, Mathias A Leidl

  • 1Mechanisms of Transcription Laboratory, Clare Hall Laboratories, Cancer Research UK London Research Institute, Potters Bar, United Kingdom.

Plos One
|October 12, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed MultiDsk, a novel reagent that binds ubiquitylated proteins with high affinity. This tool protects ubiquitylated proteins from degradation, aiding the study of ubiquitylation in cell extracts.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Ubiquitylation is a crucial post-translational modification regulating protein function and stability.
  • Studying ubiquitylation is challenging due to rapid reversal by de-ubiquitylating enzymes (DUBs) in cell extracts.

Purpose of the Study:

  • To develop a novel tool for studying ubiquitylation by overcoming the limitations of rapid deubiquitylation.
  • To create a high-affinity ubiquitin-binding reagent for affinity purification and protection of ubiquitylated proteins.

Main Methods:

  • Construction of a novel ubiquitin-binding protein reagent, MultiDsk, by fusing five UBA domains of yeast Dsk2 to GST.
  • Utilizing MultiDsk as an affinity resin for capturing and stabilizing ubiquitylated substrates.
  • Employing MultiDsk to protect ubiquitylated proteins from DUBs and proteasomal degradation in crude cell extracts.

Main Results:

  • MultiDsk exhibits unprecedented avidity for binding ubiquitylated substrates.
  • The MultiDsk resin effectively isolates ubiquitylated proteins from cell extracts.
  • Demonstrated that Def1 protein ubiquitylation occurs in response to DNA damage.
  • Successfully isolated ubiquitylated forms of RNA polymerase II.

Conclusions:

  • MultiDsk is a powerful tool for studying protein ubiquitylation by enabling the capture and stabilization of ubiquitylated proteins.
  • The reagent facilitates the investigation of ubiquitylation dynamics and substrate identification in complex biological samples.
  • The findings open new avenues for understanding the roles of ubiquitylation in cellular processes like DNA damage response.