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Double-reciprocal Lineweaver-Burk plots of the activities of NTPase-I (A) and NTPase-II (B). Activities were determined with various substrate concentrations in the absence (none) or presence (5 μM compound 5) of the inhibitor. The inhibition profile for NTPase-I activity is consistent with a noncompetitive mechanism, while the inhibition profile for NTPase-I activity is consistent with a competitive mechanism.
