The flavivirus dengue 1 Western Pacific,74 (DEN1 WP) virus has a positive-stranded RNA genome of 10,735 nucleotides. DEN1 WP genomic RNA was amplified into three overlapping fragments by RT-PCR. These fragments were assembled into a full-length cDNA clone in the yeast-E. coli shuttle vector pRS424, using homologous recombination in yeast. RNA produced by in vitro transcription of this clone was infectious upon electroporation into LLCMK2 cells, as shown by cytopathic effects and detection of viral antigens by indirect immunofluorescence, and by propagation of the virus released into the culture media. Biological properties of the transcript-derived virus, such as the pattern of dengue-specific protein synthesis and growth rate in LLCMK2 or C6/36 cells, resembled those of the parent DEN1 WP virus.
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| http://dx.doi.org/10.1023/a:1008160123754 | DOI Listing |
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Genotypic Differences in Dengue Virus Neutralization Are Explained by a Single Amino Acid Mutation That Modulates Virus Breathing.
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Viral Pathogenesis Section, Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
Unlabelled: Flaviviruses sample an ensemble of virion conformations resulting from the conformational flexibility of their structural proteins. To investigate how sequence variation among strains impacts virus breathing, we performed studies with the monoclonal antibody (MAb) E111, which binds an inaccessible domain III envelope (E) protein epitope of dengue virus serotype 1 (DENV1). Prior studies indicated that an observed ~200-fold difference in neutralization between the DENV1 strains Western Pacific-74 (West Pac-74) and 16007 could not be explained by differences in the affinity of MAb E111 for each strain.
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