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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta

Published on: December 5, 2019

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Formation of functional E3 ligase complexes with UBC2 and UEV1 of Leishmania mexicana

Rebecca J Burge1, Katie H Jameson2, Vincent Geoghegan1

  • 1York Biomedical Research Institute, Department of Biology, University of York, York YO10 5DD, UK.

Molecular and Biochemical Parasitology
|March 31, 2024
PubMed

Insights

The ubiquitin proteasome system is crucial for Leishmania mexicana parasite survival and differentiation. Researchers identified key protein interactions essential for this process, revealing new targets for anti-parasitic therapies.

Area of Science:

  • Cell Biology
  • Parasitology
  • Biochemistry

Background:

  • Multicomponent enzyme systems regulate protein modification and cellular responses in eukaryotes.
  • The ubiquitin proteasome system (UPS) is vital for Leishmania mexicana survival, with UBC2 and UEV1 essential for parasite differentiation.
  • Previous studies established the importance of the UPS and identified UBC2 and UEV1 as critical for Leishmania differentiation.

Purpose of the Study:

  • To identify interacting proteins of UBC2 and UEV1 in Leishmania mexicana promastigotes.
  • To further elucidate the UBC2-dependent ubiquitination pathway involved in parasite differentiation.
  • To characterize the roles of identified E3 ligases in ubiquitination reactions.

Main Methods:

  • Immunoprecipitation of Myc-UBC2 and Myc-UEV1 to identify interacting proteins.
  • Mass spectrometry-based interactome analysis.
  • In vitro ubiquitination assays using recombinant E3 ligases.

Main Results:

  • The UBC2 interactome includes UEV1, four RING E3 ligases, and potential substrates in carbohydrate metabolism and intracellular trafficking.
  • The UEV1 interactome consists of UBC2 and shared proteins, indicating intracellular UBC2-UEV1 complexes.
  • Recombinant RING1, RING2, and RING4 E3 ligases facilitated ubiquitin transfer reactions.

Conclusions:

  • Identified novel components of the UBC2-dependent ubiquitination pathway in Leishmania mexicana.
  • These findings expand our understanding of the UPS in Leishmania and its role in parasite differentiation.
  • The characterized pathway components may represent potential targets for therapeutic intervention against Leishmania infections.
Keywords:
InteractomeLeishmaniaProteomicsUbiquitinUbiquitin ligaseUbiquitin-conjugating enzyme (E2 enzyme)

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