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KMID : 0380220060390050571
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Journal of Biochemistry and Molecular Biology
2006 Volume.39 No. 5 p.571 ~ p.577
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Expression and Characterization of RNA-dependent RNA Polymerase of Dendrolimus punctatus Tetravirus
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Zhou Liang
Zhang Jiamin
Wang Xiaochun
Jiang Hong
Yi Fuming
Hu Yuanyang
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Abstract
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Dendrolimus punctatus tetravirus (DpTV) has been identified as a new member of the genus Omegatetravirus of the family Tetraviridae that may be related serologically to Nudaurelia capensis virus (NωV). To establish the function of DpTV RNA genome and to better understand the mechanism of viral replication, the putative RNAdependent RNA polymerase (RdRp) domain has been cloned and expressed in Escherichia coli. The recombinant protein was purified on a Ni-chelating HisTrap affinity column and demonstrated to initiate viral RNA synthesis in a primer-independent manner but not by terminal nucleotidyle transferase activity in the presence of Mg2+ and RNA template. Mutation of the GDD to GAA interferes with the residues at the polymerase active site and metal ions, and thus renders the polymerase inactive.
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KEYWORD
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Dendrolimus punctatus tetravirus, RNA-dependent RNA polymerase, RNA synthesis
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