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Title: Characterization of soluble RNA-dependent RNA polymerase from dengue virus serotype 2: The polyhistidine tag compromises the polymerase activity
Authors: Maliwan Kamkaew
Sarin Chimnaronk
Mahidol University
Keywords: Biochemistry, Genetics and Molecular Biology;Medicine
Issue Date: 1-Aug-2015
Citation: Protein Expression and Purification. Vol.112, (2015), 43-49
Abstract: © 2015 Elsevier Inc. The viral RNA polymerase is an attractive target for inhibition in the treatment of viral infections. In the case of dengue virus (DENV), a member of the genus Flavivirus, the RNA-dependent RNA polymerase (RdRp) activity resides in the C-terminal two-thirds of non-structural protein (NS) 5 responsible for the de novo synthesis of the viral RNA genome. Among four distinct, but closely related dengue serotypes, serotype 2 (DENV-2) produces more severe diseases than other serotypes. It has been reported that bacterial production of the recombinant DENV-2 RdRp was difficult due to its low expression and solubility levels. To facilitate functional and structural analyses, we here demonstrate complete protocols for overexpression and purification of soluble DENV-2 RdRp, increasing protein yields by a remarkable 10 times compared to earlier reports. Three different forms of DENV-2 RdRp as either N- or C-terminally His-tagged fusions, or without tag, were purified to homogeneity. We show here that the presence of both the N- and C-terminal His-tag had a deleterious effect on polymerase activity and, in contrast to earlier studies, our non-tagged RdRp did not require manganese ions to activate RNA polymerization. We also determined an apparent K<inf>d</inf> value of 53 nM for binding to the 5′-UTR RNA by surface plasmon resonance (SPR). Our work provide a more suitable material for basic research of viral RdRp and for drug development.
ISSN: 10465928
Appears in Collections:Scopus 2011-2015

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