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. 1987 Jan 26;15(2):839–852. doi: 10.1093/nar/15.2.839

Actinomycin D facilitates transition of AT domains in molecules of sequence (AT)nAGCT(AT)n to a DNAse I detectable alternating structure.

M J Lane, S Laplante, R P Rehfuss, P N Borer, C R Cantor
PMCID: PMC340471  PMID: 3822817

Abstract

The interaction of actinomycin D with (AT)nAGCT(AT)n (where n = 2, 3, or 4) was investigated using a combination of imino proton NMR and DNAse I digestion. The stoichiometry of the interaction appears to be one:one with the actinomycin chromophore intercalated between the two GC base pairs. This binding event facilitates the conversion of the flanking repetitive AT regions to an alternating conformation characterized by induced sensitivity of the ApT sequences to attack by DNAse I. The neighboring TpA sequences do not exhibit rate changes as a function of binding of the drug. The potential relevance of such ligand induced DNA structural alterations is discussed.

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Selected References

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