1887

Abstract

DNA helicases of baculoviruses are essential for virus replication and have been implicated as molecular determinants of host range. Although these proteins contain seven motifs (I, Ia, II–VI) characteristic of DNA helicases, the two most important characteristics of helicases – duplex-DNA unwinding and ATPase activity – have not been demonstrated. In the present study, a recombinant putative DNA helicase (rP137) of granulovirus (TnGV) was purified from insect cells infected with a recombinant multicapsid nucleopolyhedrovirus that overproduced rP137. The rP137 protein exhibited an intrinsic DNA-independent ATPase activity that required Mg as a co-factor, an activity that was reduced in the presence of TnGV and phage λ DNAs. These results provide further evidence that baculovirus helicase genes encode proteins with biochemical properties similar to those of classical DNA helicases.

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2000-06-01
2019-10-23
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