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Physical and functional interaction between the HCMV IE2 protein and the Wilms' tumor suppressor WT1
1Institute for Molecular Biology, Seoul National University, Seoul, 151-742, Korea.
Abstract:
Human cytomegalovirus (HCMV) is a major renal pathogen in congenitally infected infants and renal allograft recipients. It has been shown that human kidney cells of glomerular, tubular, and vascular origin were all infected by HCMV in vitro. It has previously been demonstrated that the IE2 protein of HCMV directly associates with the zinc finger domain of Egr-1. The zinc finger region of WT1 is a sequence-specific DNA-binding domain which also recognizes the consensus DNA binding site (5'-CGCCCCCGC-3') of Egr-1, thus suggesting a possible interaction between WT1 and IE2. Here we demonstrate that HCMV IE2 binds to the C-terminal region of WT1 containing zinc finger domain in vivo as well as in vitro and that WT1 can inhibit IE2-driven transactivation of the responsive promoter. Our results suggest that WT1 may be able to regulate the functional activity of HCMV IE2. Furthermore, these data may provide new insights into the possible involvement of HCMV in WT1-related pathogeneses.
Insights
Human cytomegalovirus (HCMV) infects kidney cells. This study shows HCMV IE2 protein interacts with WT1 protein, potentially regulating viral activity and offering insights into HCMV-related kidney diseases.
Area of Science:
- Virology
- Nephrology
- Molecular Biology
Background:
- Human cytomegalovirus (HCMV) is a significant cause of kidney disease in infants and transplant recipients.
- HCMV infects various kidney cell types, including glomerular, tubular, and vascular cells.
- Previous research indicated an association between HCMV IE2 protein and Egr-1's zinc finger domain.
Purpose of the Study:
- To investigate the potential interaction between HCMV IE2 protein and Wilms Tumor 1 (WT1) protein.
- To determine if WT1 influences the activity of HCMV IE2.
- To explore the implications of this interaction for HCMV pathogenesis in the kidney.
Main Methods:
- In vivo and in vitro binding assays to assess the interaction between HCMV IE2 and WT1.
- Reporter assays to evaluate the effect of WT1 on IE2-driven promoter transactivation.
Main Results:
- Demonstrated that HCMV IE2 binds to the C-terminal zinc finger region of WT1.
- Confirmed this interaction occurs both in vivo and in vitro.
- Showed that WT1 can inhibit the transactivation activity driven by HCMV IE2.
Conclusions:
- WT1 protein can interact with and potentially regulate the functional activity of HCMV IE2.
- This interaction may provide new insights into the role of HCMV in diseases associated with WT1.
- Further research is warranted to explore the clinical significance of HCMV and WT1 interplay in renal pathologies.