The first example of a phosphodiester bond cleavage promoted by a highly negatively charged polyoxometalate cluster has been discovered: the hydrolysis of the phosphodiester bond in a DNA model substrate bis(p-nitrophenyl) phosphate (BNPP) is promoted by the heptamolybdate anion [Mo7O24](6-) with rates which represent an acceleration of nearly four orders of magnitude compared to the uncatalyzed cleavage.
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