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Apoptin's functional N- and C-termini independently bind DNA
S R Leliveld1, R T Dame, J L Rohn
1Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA, Leiden, The Netherlands.
FEBS Letters
|January 27, 2004
Summary
Apoptin, a tumor-cell-killing protein, binds DNA via its N- and C-terminal domains. Cooperative DNA binding is essential for forming superstructures that induce apoptosis.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Apoptin selectively induces apoptosis in tumor cells.
- Apoptin localizes to heterochromatin and nucleoli, interacting with DNA.
- Apoptin's N- and C-terminal domains possess cell-killing activity.
Purpose of the Study:
- To investigate the DNA-binding properties of Apoptin's N- and C-terminal domains.
- To determine the role of cooperative DNA binding in Apoptin's function.
- To explore the link between Apoptin's DNA affinity and its apoptotic activity.
Main Methods:
- In vitro DNA-binding assays.
- Analysis of nucleoprotein superstructure formation.
- Assessment of cell-killing activity of Apoptin and its fragments.
Main Results:
- Both N- and C-terminal halves of Apoptin independently bind DNA.
- Truncation mutants showed reduced DNA-binding affinity and cell-killing activity.
- Cooperative DNA binding and superstructure formation were observed only with full-length Apoptin.
Conclusions:
- Apoptin possesses multiple independent DNA-binding sites.
- Cooperative DNA binding is crucial for Apoptin-mediated nucleoprotein superstructure formation.
- Apoptin's apoptotic activity and DNA-binding affinity are functionally linked.