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• W2032037662 abstract "The non-structural (NS) proteins of parvoviruses are involved in essential steps of the viral life cycle. Various biochemical functions, such as ATP binding, ATPase, site-specific DNA binding and nicking, and helicase activities, have been assigned to the protein NS1. Compared with the non-structural proteins of the vertebrate parvoviruses, the NS proteins of the Densovirinae have not been well characterized. Here, we describe the biochemical properties of NS1 of Periplaneta fuliginosa densovirus (PfDNV). We have expressed and purified NS1 using a baculovirus system and analyzed its enzymatic activity. The purified recombinant NS1 protein possesses ATPase- and ATP- or dATP-dependent helicase activity requiring either Mg2+ or Mn2+ as a cofactor. The ATPase activity of NS1 can be efficiently stimulated by single-stranded DNA. The ATPase coupled helicase activity was detected on blunt-ended double-stranded oligonucleotide substrate. Using South-Western and Dot-spot assays, we identified a DNA fragment that is recognized specifically by the recombinant NS1 protein. The fragment consists of (CAC)4 and is located on the hairpin region of the terminal palindrome. The domain for DNA binding was defined to the amino-terminal region (amino acids 1–250). In addition, we found that NS1 can form oligomeric complexes in vivo and in vitro. Mutagenesis analysis showed that ATP binding is necessary for oligomerization. Based on these results, it seems that PfDNV NS1, a multifunctional protein, plays an important role in viral DNA replication comparable to those of vertebrate parvovirus initiator proteins." @default.
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• W2032037662 date "2006-04-01" @default.
• W2032037662 modified "2023-09-26" @default.
• W2032037662 title "Biochemical characterization of Periplaneta fuliginosa densovirus non-structural protein NS1" @default.
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• W2032037662 doi "https://doi.org/10.1016/j.bbrc.2006.02.053" @default.
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