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HERC3 binding to and regulation by ubiquitin
C Cruz1, F Ventura, R Bartrons
1Unitat de Bioquímica i Biologia Molecular, Departament de Ciències Fisiològiques II, Campus de Bellvitge, Universitat de Barcelona, C/Feixa Llarga s/n, E-08907 L'Hospitalet de Llobregat, Barcelona, Spain.
FEBS Letters
|February 13, 2001
Summary
Researchers identified HERC3, a novel protein involved in cellular processes. This protein interacts with ubiquitin and is regulated by ubiquitination, suggesting roles in vesicular traffic and ubiquitin-dependent pathways.
Area of Science:
- Cell Biology
- Molecular Biology
- Protein Biochemistry
Background:
- The HERC (HECT domain and RCC1 domain) protein family has dual roles as guanine nucleotide exchange factors and E3 ubiquitin ligases.
- A previously unstudied member of this family, HERC3, was investigated.
Purpose of the Study:
- To identify and characterize the novel HERC3 protein.
- To elucidate the cellular localization and function of HERC3 within the ubiquitin-proteasome system and vesicular trafficking.
Main Methods:
- Immunological detection using specific antibodies.
- Subcellular localization studies using markers like beta-COP, ARF, and Rab5.
- Investigation of protein interactions with ubiquitin.
- Analysis of HERC3 ubiquitination and proteasomal degradation.
Main Results:
- HERC3 was detected in various cell types, localized to the cytosol and vesicular structures.
- HERC3 non-covalently interacts with ubiquitin, independent of the conserved HECT cysteine.
- HERC3 itself is ubiquitinated and degraded by the proteasome, indicating regulatory control.
Conclusions:
- HERC3 is a novel, regulated protein involved in the ubiquitin system.
- Findings suggest HERC3 plays a role in vesicular transport and ubiquitin-dependent cellular processes.