Journal
ARCHIVES OF VIROLOGY
Volume 156, Issue 1, Pages 63-69Publisher
SPRINGER WIEN
DOI: 10.1007/s00705-010-0816-8
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Funding
- Ministry of Health, Labour, and Welfare [H20-Shinkou-ippan-003, H20-Shinkou-ippan 015, H20-Iyaku-ippan-077]
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [22590423]
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Flavivirus NS4A has an N-terminal hydrophilic cytoplasmic portion; however, the role of this portion remains poorly understood. In this study, we show that a recombinant dengue type 1 virus (DENV-1) in which a subportion (amino acids 27-34) of the N-terminal portion of NS4A is replaced by the corresponding region from Japanese encephalitis virus (JEV) is defective in replication. Using the defective mutant clone NS4A(27-34(JEV)), we recovered suppressor mutant viruses that carry various non-synonymous mutations. Site-directed mutational analysis indicated that a single non-synonymous mutation in NS4B that is found in the suppressor viruses is sufficient to restore NS4A(27-34(JEV)). Recombinant DENV-1 with single mutations in NS4B had increased growth properties as compared to the wild-type virus and NS4A(27-34(JEV)) virus bearing the same NS4B mutation. Collectively, our results suggest that the NS4B mutation enhanced the growth of DENV-1, irrespective of the sequence of the 27-34 subportion NS4A.
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