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. 1988 Dec 9;16(23):11125–11139. doi: 10.1093/nar/16.23.11125

Actinomycin D induced DNase I cleavage enhancement caused by sequence specific propagation of an altered DNA structure.

Y Q Huang 1, R P Rehfuss 1, S R LaPlante 1, E Boudreau 1, P N Borer 1, M J Lane 1
PMCID: PMC339000  PMID: 3205740

Abstract

Two DNA hexadecamers containing one central 5'-GC-3' base step have been examined by footprinting methodology in the presence and absence of actinomycin D. The results of these studies, coupled with imino proton NMR measurements indicate that the antitumor drug causes a change in DNA conformation at a distance from the actinomycin intercalation site in a molecule of sequence d[ATATATAGCTATATAT] that does not occur in d[AAAAAAAGCTTTTTTT]. The experiments demonstrate that DNase I rate enhancements associated with actinomycin D binding are caused by ligand alteration of equilibrium DNA structure.

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Selected References

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