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Berenil binding to higher ordered nucleic acid structures: complexation with a DNA and RNA triple helix
D S Pilch1, M A Kirolos, K J Breslauer
1Department of Chemistry, Rutgers, State University of New Jersey, New Brunswick 08903, USA.
Biochemistry
|December 12, 1995
Summary
Berenil, an antitrypanosomal drug, binds to DNA and RNA triplexes, influencing their stability and melting behavior. This binding is enthalpically favorable and occurs primarily through a minor groove binding mode.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Berenil is an established antitrypanosomal agent known to bind nucleic acid duplexes.
- Previous studies indicated berenil exhibits both intercalation and groove binding properties with DNA and RNA duplexes.
Purpose of the Study:
- To investigate the binding interactions of berenil with DNA and RNA triplexes.
- To characterize the thermodynamic and structural consequences of berenil binding to nucleic acid triplexes.
Main Methods:
- Spectroscopic techniques
- Calorimetric methods
- Hydrodynamic measurements (viscometry)
Main Results:
- Berenil binds to DNA and RNA triplexes without displacing major groove ligands.
- Binding affects triplex thermal stability in a salt and drug-density-dependent manner.
- Non-intercalative, minor groove binding is indicated, with higher affinity for DNA triplexes.
- Binding is enthalpically favorable and reduces cooperativity of triplex-to-duplex melting.
Conclusions:
- Berenil interacts with DNA and RNA triplexes, exhibiting distinct binding modes and thermodynamic profiles compared to duplex binding.
- The drug's impact on triplex stability is complex and influenced by environmental factors and drug concentration.
- Findings contribute to understanding berenil's mechanism of action and potential for targeting nucleic acid structures.