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Related Experiment Video

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Using Phage Display to Develop Ubiquitin Variant Modulators for E3 Ligases
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Screening E3 substrates using a live phage display library.

Zhengguang Guo1, Xiaorong Wang, Huihua Li

  • 1Department of Physiology and Pathophysiology, National Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences/School of Basic Medicine, Peking Union Medical College, Beijing, China ; Department of Core Instrument Facility, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences/School of Basic Medicine, Peking Union Medical College, Beijing, China.

Plos One
|October 15, 2013
PubMed
Summary

Researchers developed a simple, efficient high-throughput method to identify ubiquitin ligase (E3) substrates using live phage display. This approach successfully discovered novel E3 MDM2 substrates, including DDX42, TP53RK, and RPL36a.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Ubiquitin ligases (E3s) are crucial for protein regulation, but identifying their substrates remains a significant challenge.
  • Current methods for substrate identification are often low-throughput and lab-specific, limiting discovery.
  • Understanding E3 substrate specificity is vital for deciphering cellular signaling pathways.

Purpose of the Study:

  • To develop a novel, high-throughput strategy for identifying E3 ligase substrates.
  • To discover novel substrates for the E3 ligase MDM2.
  • To demonstrate the broad applicability of the developed strategy for other E3 ligases.

Main Methods:

  • Utilized a live phage display library engineered to serve as E3 ligase substrates.
  • Employed in vitro screening with enrichment of His-ubiquitinated phage using Ni-beads.
  • Amplified enriched phage by infecting E. coli for subsequent analysis.
  • Validated candidate substrates through in vitro ubiquitination assays and ex vivo confirmation.

Main Results:

  • Identified 16 natural and numerous unnatural potential substrates for E3 MDM2 across 4 independent screenings.
  • Confirmed ubiquitination of 10 out of 12 selected candidate substrates by MDM2 in vitro.
  • Validated three novel MDM2 substrates (DDX42, TP53RK, RPL36a) ex vivo.
  • Demonstrated the strategy's efficiency and ability to discover non-degradation substrates.

Conclusions:

  • The developed live phage display strategy offers a simple, efficient, and high-throughput method for E3 substrate identification.
  • This approach successfully identified novel substrates for MDM2, expanding the known repertoire of its targets.
  • The methodology is adaptable for discovering substrates of various E3 ligases, provided they do not ubiquitinate the empty phage vector.