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Altered sequence specificity identified from a library of DNA-binding small molecules.
V M Guelev1, M T Harting, R S Lokey
1Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, TX 78712, USA.
Chemistry & Biology
|February 9, 2000
Summary
Researchers modified small molecules to target specific DNA sequences, creating new derivatives with altered binding preferences. This advancement could lead to versatile DNA-targeting ligands for research and medicine.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Biochemistry
Background:
- Small molecules can target specific DNA sequences, impacting research and medicine.
- Previous bis-intercalating molecules bind DNA cooperatively, favoring G+C-rich regions.
Purpose of the Study:
- To investigate the DNA binding properties of bis-intercalating molecules with randomized peptide linkers.
- To identify derivatives with novel sequence specificity and binding characteristics.
Main Methods:
- Screening a library of bis-intercalating derivatives using DNase I footprinting on a 231 bp DNA fragment.
- Analyzing cleavage enhancement bands to identify sequence-specific binding.
- Deconvoluting the library to isolate derivatives with unique specificities.
Main Results:
- The parent bis-intercalator bound to a 15 bp G+C-rich repeat above 125 nM.
- A lysine-tris-beta-alanine derivative exhibited novel specificity, binding to a 19 bp palindrome.
- The novel derivative maintained significant binding affinity.
Conclusions:
- Simple synthetic modifications can yield bis-intercalating compounds with new DNA sequence specificities.
- Modified compounds may retain cooperative binding, enabling the development of versatile DNA ligands.
- Potential applications include targeting long DNA sequences selectively for research and therapeutic purposes.