Actinomycin D induced DNase I cleavage enhancement caused by sequence specific propagation of an altered DNA structure.
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.
Huang
Y Q
YQ
Department of Medicine, State University of New York, Syracuse 13210.
Rehfuss
R P
RP
LaPlante
S R
SR
Boudreau
E
E
Borer
P N
PN
Lane
M J
MJ
D001482:Base Composition / Q000187:drug effects; D004247:DNA / Q000187:drug effects*; D004249:DNA Damage; D003609:Dactinomycin / Q000494:pharmacology*; D003850:Deoxyribonuclease I; D009682:Magnetic Resonance Spectroscopy; D009690:Nucleic Acid Conformation / Q000187:drug effects*; D015345:Oligonucleotide Probes
D015345:Oligonucleotide Probes; D003609:Dactinomycin; D004247:DNA; D003850:Deoxyribonuclease I