Purification and characterization of West Nile virus nucleoside triphosphatase (NTPase)/helicase: Evidence for dissociation of the NTPase and helicase activities of the enzyme

The nucleoside triphosphatase (NTPase)/helicase associated with nonstructur al protein 3 of West Nile (WN) virus was purified from cell culture medium harvested from virus-infected Vero cells. The purification procedure includ ed sequential chromatography on Superdex-200 and Reactive Red 120 columns, followed by a concentration step on an Ultrogel hydroxyapatite column. The nature of the purified protein was confirmed by immunoblot analysis using a WN virus-positive antiserum, determination of its NH, terminus by microseq uencing, and a binding assay with 5'-[C-14]fluorosulfonylbenzoyladenosine. Under optimized reaction conditions the enzyme catalyzed the hydrolysis of ATP and the unwinding of the DNA duplex with k(cat) values of 133 and 5.5 x 10(-3) s(-1), respectively. Characterization of the NTPase activity of the WN virus enzyme revealed that optimum conditions with respect to the Mg2requirement and the monovalent salt or polynucleotide response differed fro m those of other flavivirus NTPases, Initial kinetic studies demonstrated t hat the inhibition (or activation) of ATPase activity by ribavirin-5'-triph osphate is not directly related to changes in the helicase activity of the enzyme. Further analysis using guanine and O-6-benzoylguanine derivatives r evealed that the ATPase activity of WN virus NTPase/helicase may be modulat ed, i.e., increased or reduced, with no effect on the helicase activity of the enzyme. On the other hand the helicase activity could be modulated with out changing the ATPase activity. Our observations show that the number of ATP hydrolysis events per unwinding cycle is not a constant value.