Abstract
Actinomycin D has long been known to bind selectively to the dinucleotide step GpC. We have investigated its ability to bind to other non-canonical sequences using a series of synthetic DNA fragments. DNase I footprinting experiments reveal that actinomycin can also bind well to GG (CC). Binding to this sequence and the canonical GC site is potentiated by flanking regions of (GT) n·(AC) n Weaker but specific binding to GT and AC is also evident and appears to be cooperative.
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