Abstract
A new quadruplex motif located in the promoter of the human KRAS gene, within a nuclease hypersensitive element (NHE), has been characterized. Oligonucleotides mimicking this quadruplex are found to compete with a DNA-protein complex between NHE and a nuclear extract from pancreatic cancer cells. When modified with (R)-1-O-[4-1-(1-pyrenylethynyl) phenylmethyl]glycerol insertions (TINA), the quadruplex oligonucleotides showed a dramatic increase of the T(m) (deltaT(m) from 22 to 32 degrees C) and a strong antiproliferative effects in Panc-1 cells.
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