Recognition of the DNA minor groove by pyrrole-imidazole polyamides: comparison of desmethyl- and N-methylpyrrole.

Abstract:

:Polyamides consisting of N-methylpyrrole (Py), N-methylimidazole (Im), and N-methyl-3-hydroxypyrrole (Hp) are synthetic ligands that recognize predetermined DNA sequences with affinities and specificities comparable to many DNA-binding proteins. As derivatives of the natural products distamycin and netropsin, Py/Im/Hp polyamides have retained the N-methyl substituent, although structural studies of polyamide:DNA complexes have not revealed an obvious function for the N-methyl. In order to assess the role of the N-methyl moiety in polyamide:DNA recognition, a new monomer, desmethylpyrrole (Ds), where the N-methyl moiety has been replaced with hydrogen, was incorporated into an eight-ring hairpin polyamide by solid-phase synthesis. MPE footprinting, affinity cleavage, and quantitative DNase I footprinting revealed that replacement of each Py residue with Ds resulted in identical binding site size and orientation and similar binding affinity for the six-base-pair (bp) target DNA sequence. Remarkably, the Ds-containing polyamide exhibited an 8-fold loss in specificity for the match site versus a mismatched DNA site, relative to the all-Py parent. Polyamides with Ds exhibit increased water solubility, which may alter the cell membrane permeability properties of the polyamide. The addition of Ds to the repertoire of available monomers may prove useful as polyamides are applied to gene regulation in vivo. However, the benefits of Ds incorporation must be balanced with a potential loss in specificity.

journal_name

Bioorg Med Chem

authors

Bremer RE,Szewczyk JW,Baird EE,Dervan PB

doi

10.1016/s0968-0896(00)00145-0

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

1947-55

issue

8

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(00)00145-0

journal_volume

8

pub_type

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