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DNA recognition by intercalators and hybrid molecules

M J Waring¹, C Bailly

¹University of Cambridge Department of Pharmacology, UK.

Journal of Molecular Recognition : JMR

|June 1, 1994

Summary

The 2-amino group of guanine is crucial for DNA sequence recognition by ligands. Modified DNA sequences alter antibiotic binding patterns, aiding in the design of sequence-selective DNA-binding molecules.

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Area of Science:

Molecular Biology
Medicinal Chemistry
Biochemistry

Background:

Specific ligands recognize DNA sequences through interactions with nucleotide bases.
The 2-amino group of guanine plays a key role in these recognition events.
Developing molecules that selectively bind to specific DNA sequences is important for therapeutic applications.

Purpose of the Study:

To investigate the role of the 2-amino group of guanine in DNA sequence recognition.
To explore the use of modified DNA and small molecules for sequence-selective binding.
To design and synthesize novel hybrid molecules for targeted DNA binding.

Main Methods:

DNA footprinting assays using homologous tyrT DNA substituted with inosine or 2,6-diaminopurine.
Challenging modified DNA with sequence-selective antibiotics (echinomycin, actinomycin, netropsin).
Synthesis and characterization of hybrid molecules combining distamycin and ellipticine moieties.
Molecular modeling to guide the refinement of hybrid molecules.

Main Results:

Modified DNA sequences (inosine, 2,6-diaminopurine) resulted in altered footprinting patterns with antibiotics.
An initial hybrid molecule showed tight DNA binding but lacked sequence selectivity.
A second-generation hybrid molecule, refined by molecular modeling and bearing an additional positive charge, exhibited strong selectivity for AT-rich DNA tracts.

Conclusions:

The 2-amino group of guanine is a critical determinant for DNA sequence recognition by ligands.
The combilexin strategy, combining different DNA-binding motifs, can be refined for sequence selectivity.
The developed positively charged hybrid molecule represents a promising tool for targeting AT-rich DNA sequences.

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