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Heterogeneous DNA binding modes of berenil
F Barceló1, M Ortiz-Lombardía, J Portugal
1Departament de Biologia Fundamental i Ciencies de la Salut, Universitat de les Illes Balears, Palma de Mallorca, Spain.
Biochimica Et Biophysica Acta
|June 22, 2001
Summary
Berenil preferentially binds AT-rich DNA but also binds GC-rich sites, suggesting secondary binding interactions. Molecular modeling confirms berenil intercalation into CpG steps is possible.
Area of Science:
- Molecular Biology
- Biophysics
- Drug Discovery
Background:
- Berenil is a DNA-binding drug with a known preference for AT-rich sequences.
- Understanding berenil's interaction with diverse DNA sequences is crucial for its therapeutic applications.
Purpose of the Study:
- To investigate the binding thermodynamics and mechanisms of berenil with various DNA sequences.
- To explore the potential for berenil to bind to GC-rich DNA regions.
Main Methods:
- Isothermal titration calorimetry (ITC) to quantify berenil-DNA binding.
- Ultraviolet melting and differential scanning calorimetry to analyze DNA-drug interactions.
- Circular dichroism (CD) spectroscopy to assess DNA structural changes.
- Molecular modeling to predict berenil-DNA complex structures.
Main Results:
- ITC data revealed that berenil binds to both AT-rich and GC-rich DNA sequences.
- Binding isotherms indicated complex interactions, suggesting multiple binding site types.
- CD experiments demonstrated berenil intercalation into GC-rich sites.
- Molecular modeling supported the feasibility of berenil intercalation into CpG steps.
Conclusions:
- Berenil exhibits a broader DNA binding profile than previously assumed, interacting with GC-rich regions.
- Secondary binding sites, likely GC-rich, contribute to berenil's interaction with DNA.
- The intercalation of berenil into CpG steps is sterically feasible, explaining binding to GC-rich sites.