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Spatial organization of topoisomerase I-mediated DNA cleavage induced by camptothecin-oligonucleotide conjugates.

Abstract：

:Triple helix-forming oligonucleotides covalently linked to topoisomerase I inhibitors, in particular the antitumor agent camptothecin, trigger topoisomerase I-mediated DNA cleavage selectively in the proximity of the binding site of the oligonucleotide vector. In the present study, we have performed a systematic analysis of the DNA cleavage efficiency as a function of the positioning of the camptothecin derivative, either on the 3' or the 5' side of the triplex, and the location of the cleavage site. A previously identified cleavage site was inserted at different positions within two triplex site-containing 59 bp duplexes. Sequence-specific DNA cleavage by topoisomerase I occurs only with triplex conjugates bearing the inhibitor at the 3'-end of the oligonucleotide and on the oligopyrimidine strand of the duplex. The lack of targeted cleavage on the 5' side is attributed to the structural differences of the 3' and 5' duplex-triplex DNA junctions. The changes induced in the double helix by the triple-helical structure interfere with the action of the enzyme according to a preferred spatial organization. Camptothecin conjugates of oligonucleotides provide efficient tools to probe the organization of the topoisomerase I-DNA complex and will be useful to understand the functioning of topoisomerase I in living cells.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Arimondo PB,Angenault S,Halby L,Boutorine A,Schmidt F,Monneret C,Garestier T,Sun JS,Bailly C,Hélène C

doi

10.1093/nar/gkg457

keywords:

subject

Has Abstract

pub_date

2003-07-15 00:00:00

pages

4031-40

issue

14

eissn

0305-1048

issn

1362-4962

journal_volume

31

pub_type

杂志文章

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