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Published October 2000 | public
Journal Article

Alternative Heterocycles for DNA Recognition: A 3-Pyrazole/Pyrrole Pair Specifies for G·C Base Pairs

Abstract

Synthetic ligands comprising three aromatic amino acids, pyrrole (Py), imidazole (Im), and hydroxypyrrole (Hp), specifically recognize predetermined sequences as side-by-side pairs in the minor groove of DNA. To expand the repertoire of aromatic rings that may be utilized for minor groove recognition, three five-membered heterocyclic rings, 3-pyrazolecarboxylic acid (3-Pz), 4-pyrazolecarboxylic acid (4-Pz), and furan-2-carboxylic acid (Fr), were examined at the N-terminus of eight-ring hairpin polyamide ligands. The DNA binding properties of 3-Pz, 4-Pz, and Fr each paired with Py were studied by quantitative DNase I footprinting titrations on a 283 bp DNA restriction fragment containing four 6-bp binding sites 5′-A TNCCTAA-3′ (N=G, C, A, or T; 6-bp polyamide binding site is underlined). The pair 3-Pz/Py has increased binding affinity and sequence specificity for G·C bp compared with Im/Py.

Additional Information

© 2000 Elsevier Science Ltd. Received 3 April 2000; accepted 16 June 2000. We are grateful to the National Institutes of Health (GM-27681) for research support.

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023