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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
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Cellular SUMO-specific proteases regulate HAdV-C5 E1B-55K SUMOylation and virus-induced cell transformation
Wing-Hang Ip1, Marie Fiedler1, Britta Gornott1
1Department of Viral Transformation, Leibniz Institute of Virology (LIV), Hamburg, Germany.
Frontiers in Cellular and Infection Microbiology
|October 14, 2024
Summary
Human adenovirus (HAdV) oncoprotein E1B-55K is deSUMOylated by SENP 1, impacting its role in cell transformation. This interaction, independent of E4orf6, reveals new insights into HAdV replication and host interactions.
Area of Science:
- Virology
- Molecular Biology
- Cellular Biology
Background:
- Viral proteins undergo post-translational modification, including SUMO-conjugation, during human adenovirus (HAdV) replication.
- SUMOylation affects protein localization and cell transformation, with HAdV oncoprotein E1B-55K being a key target.
- Adenoviral oncoprotein E4orf6 influences E1B-55K SUMOylation, while cellular sentrin/SUMO-specific proteases (SENPs) reverse this modification.
Purpose of the Study:
- To investigate the interaction between HAdV oncoprotein E1B-55K and cellular SENPs.
- To understand the deSUMOylation activities of SENPs on E1B-55K.
- To elucidate the consequences of E1B-55K deSUMOylation for adenovirus-mediated cell transformation.
Main Methods:
- Co-immunoprecipitation assays to detect protein interactions.
- Western blotting to analyze SUMOylation and deSUMOylation levels.
- Focus formation assays to assess cell transformation capabilities.
Main Results:
- E1B-55K directly interacts with SENP 1.
- SENP 1 deSUMOylates E1B-55K independently of the viral oncoprotein E4orf6.
- SENP 1 inhibits E1A/E1B-mediated focus formation in rodent cells, indicating a role in preventing cell transformation.
Conclusions:
- SENP 1 plays a crucial role in regulating E1B-55K SUMOylation status.
- The interaction between E1B-55K and SENP 1 is a significant factor in controlling HAdV-mediated cell transformation.
- These findings provide a foundation for further research into adenovirus-host interactions and the oncogenic mechanisms of HAdV.
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