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Could hydrolysis of arsenic substituted DNA be prevented? Protection arises from stacking interactions.

Investigation of the hydrolysis of dinucleoside-arsenate-deoxyguanylyl-3',5'-deoxyguanosine (dGAsdG(-)) reveals that base-stacking in DNA increases the resistance of As-DNA towards hydrolysis. Base-stacking raises the activation energy of hydrolysis. Hydrolysis of As-DNA is found to be endothermic. The hydrolysis stability of As-DNA should be higher than that estimated based on arsenate diester models.