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The MutT protein, which prevents AT----CG transversions during DNA replication, hydrolyzes nucleoside triphosphates to yield nucleoside monophosphates and pyrophosphate. The hydrolysis of dGTP by the MutT protein in H(2)18O-enriched water, when monitored by high resolution 31P NMR spectroscopy at 242.9 MHz, showed 18O labeling of the pyrophosphate product, as manifested by a 0.010 +/- 0.002 ppm upfield shift of the pyrophosphate resonance, and no labeling of the dGMP product. This establishespmid:1324915 fatcat:r5zwzzjh75fjbphr3q362fdkei