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M94A0234.TXT
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1994-10-08
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Document 0234
DOCN M94A0234
TI Sequence-selective binding to DNA of cis- and trans- butamidine
analogues of the anti-Pneumocystis carinii pneumonia drug pentamidine.
DT 9412
AU Bailly C; Donkor IO; Gentle D; Thornalley M; Waring MJ; Department of
Pharmacology, University of Cambridge, UK.
SO Mol Pharmacol. 1994 Aug;46(2):313-22. Unique Identifier : AIDSLINE
MED/94359494
AB Footprinting experiments using both DNase I and methidium
propyl-EDTA.Fe(II) have been used to investigate the sequence
selectivity in binding to DNA of pentamidine and four butamidine
analogues active against the Pneumocystis carinii pathogen, which
afflicts patients with acquired immunodeficiency syndrome. In common
with pentamidine, the butamidine drugs, which contain cis- or
trans-1,4-but-2-ene linkers and either bis(amidine) or
bis(imidazolidine) terminal groups, bind selectively to DNA sequences
composed of at least 4 consecutive A.T base pairs. None of the drugs
tolerates the presence of a G.C base pair within the binding site.
Consistently in the DNase I and methidium propyl-EDTA.Fe(II)
footprinting experiments, the cis-isomers produce stronger footprints
than do the trans-isomers, despite their similar hydrogen-bonding
potentialities. The present experimental data support the view that the
conformation of the drug plays a determining role in the binding
reaction. Starting from the known structure of a
pentamidine-oligonucleotide complex, it is possible to rationalize the
different capacities of the cis- and trans-butamidine analogues to
recognize defined DNA sequences in terms of the radius of curvature of
the molecule and the distance between the positively charged terminal
groups. Together, these features constitute critical factors favoring
(cis-conformation) or hampering (trans-conformation) the fitting of the
drugs into the minor groove of DNA. In terms of structure-activity
relationships, the AT-specific recognition of DNA by this series of
butamidine derivatives cannot be directly correlated with their
potencies against Pneumocystis carinii pneumonia.
DE Base Sequence Binding Sites DNA/*METABOLISM Human Molecular Sequence
Data Pentamidine/*ANALOGS & DERIVATIVES/CHEMISTRY/*METABOLISM/
PHARMACOLOGY Pneumocystis carinii/*DRUG EFFECTS Structure-Activity
Relationship Support, Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).