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Updated: Dec 2, 2025
Author Spotlight: Combining Proximity Ligand Assay with Gamma-H2AX Staining to Characterize Protein Interactions in DNA Damage Response
Published on: August 2, 2024
Skp2 regulates DNA damage repair and apoptosis via interaction with Ku70
Jing Jia1, Dongmei Yan1, Yizhe Wang1
1Center for Molecular Medicine, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, 310013, PR China.
Purpose:
Skp2, an oncoprotein, regulates tumor proliferation, invasion and metastasis. Ku70 is a critical component of the non-homologous end-joining (NHEJ) process. Both Skp2 and Ku70 are positively associated in multiple cancers. However, there is no report about the relationship between Skp2 and Ku70 proteins.
Methods:
In this study, we carried out Bioinformatics and molecular biological methods to investigate the relationship between Skp2 and Ku70 proteins.
Results:
We first observed Skp2 and Ku70 mRNAs were significantly increased in cervical cancer tissues. And we identified Ku70 as a Skp2-binding protein and the binding site located in the C-terminal of Ku70 protein. We further found that Skp2 knockdown decreased the Ku70 protein level in cells, and increase the cellular apoptosis and DNA damage, suggesting Skp2 mediates the Ku70 protein stability and function via post-translational modification.
Conclusion:
The direct interaction between Skp2 and Ku70 proteins mediates the DNA damage repair and cellular apoptosis by regulating Ku70 stability and function via post-translational modification. The molecular mechanisms how Skp2 stabilize Ku70 would be clarified in our following research work.
Insights
Skp2 protein interacts with Ku70, regulating DNA damage repair and cell apoptosis. This interaction impacts Ku70 stability and function through post-translational modification, offering new insights into cancer progression.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Skp2 is an oncoprotein involved in tumor progression.
- Ku70 is essential for DNA repair via non-homologous end-joining (NHEJ).
- A positive association between Skp2 and Ku70 is observed in various cancers.
Purpose of the Study:
- To investigate the relationship between Skp2 and Ku70 proteins.
- To elucidate the functional interaction between Skp2 and Ku70.
Main Methods:
- Bioinformatics analysis
- Molecular biology techniques
- Protein-protein interaction assays
- Gene knockdown experiments
Main Results:
- Skp2 and Ku70 mRNA levels are elevated in cervical cancer.
- Ku70 directly binds to Skp2, with the binding site in Ku70's C-terminus.
- Skp2 knockdown reduces Ku70 protein levels, increases apoptosis, and enhances DNA damage.
Conclusions:
- Skp2 directly interacts with Ku70, regulating DNA damage repair and apoptosis.
- Skp2 influences Ku70 stability and function via post-translational modification.
- Further research will clarify the precise mechanisms of Skp2-mediated Ku70 stabilization.
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