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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Identification of two proteins, S14 and UIP1, that interact with UCH37

T Li1, W Duan, H Yang

  • 1Department of Biochemistry, Faculty of Medicine, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore, Singapore.

FEBS Letters
|February 13, 2001
PubMed

Insights

Researchers identified two proteins, S14 and UCH37 interacting protein 1 (UIP1), that bind to UCH37. The C-terminal region of UCH37 is crucial for these interactions, and UIP1 can inhibit UCH37-S14 binding.

Area of Science:

  • * Molecular biology
  • * Protein-protein interactions
  • * Ubiquitin-proteasome system

Background:

  • * UCH37 is a deubiquitinating enzyme implicated in various cellular processes.
  • * Understanding UCH37's interacting partners is key to elucidating its functions.
  • * The PA700 complex is a regulatory component of the 26S proteasome.

Purpose of the Study:

  • * To identify novel interacting partners of UCH37.
  • * To characterize the interaction domains and mechanisms between UCH37 and its partners.
  • * To investigate the functional consequence of UIP1 on UCH37-S14 interaction.

Main Methods:

  • * Yeast two-hybrid screening to identify UCH37 interacting proteins.
  • * In vitro binding assays to confirm direct protein interactions.
  • * In vivo co-immunoprecipitation to validate interactions in a cellular context.

Main Results:

  • * Identified S14 (PA700 subunit) and a novel protein, UIP1, as UCH37 interactors.
  • * Confirmed interactions using in vitro and in vivo assays.
  • * Demonstrated that the C-terminal extension of UCH37 is essential for binding S14 and UIP1.
  • * Showed that UIP1 inhibits the interaction between UCH37 and S14 in vitro.

Conclusions:

  • * UCH37 interacts with S14 and UIP1, suggesting a role in proteasome regulation.
  • * The C-terminus of UCH37 is critical for these interactions.
  • * UIP1 may act as a modulator of UCH37-S14 complex formation.

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