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The binding interface between an E2 (UBC9) and a ubiquitin homologue (UBL1)
1Division of Immunology, Beckman Research Institute of the City of Hope, Duarte, California 91010, USA.
The Journal of Biological Chemistry
|June 8, 1999
Summary
Human UBC9 protein conjugates with UBL1, a ubiquitin homologue, impacting cell cycle and DNA repair. Their binding interfaces, revealed by NMR, may be conserved in general E2-ubiquitin interactions.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Human UBC9 is an E2 ubiquitin-conjugating enzyme family member.
- UBC9 conjugates with ubiquitin homologue UBL1 (SUMO-1).
- UBC9 plays roles in cell cycle regulation, DNA repair, and p53 pathways.
Purpose of the Study:
- To determine the binding interfaces of the UBC9 and UBL1 complex.
- To understand the structural basis of UBC9-UBL1 interaction.
Main Methods:
- Nuclear magnetic resonance (NMR) spectroscopy.
- Chemical shift perturbation (CSP) analysis.
Main Results:
- The binding site of UBL1 is on its ubiquitin domain.
- The binding site of UBC9 is on a conserved E2 region.
- Detailed mapping of the UBC9-UBL1 interaction interface.
Conclusions:
- The UBC9-UBL1 system shares structural and functional similarities with the ubiquitin system.
- Observed binding interfaces may be conserved across E2-ubiquitin interactions.
- Provides insights into general mechanisms of E2 enzyme conjugation.