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Journal of General Virology, Vol 79, 2375-2380, Copyright © 1998 by Society for General Microbiology
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TJ Chambers, M Halevy, A Nestorowicz, CM Rice and S Lustig
Department of Molecular Microbiology and Immunology, St Louis University School of Medicine, MO 63104, USA. chambetj@wpogate.slu.edu
Several neuroinvasive and non-neuroinvasive West Nile (WN) viruses were characterized by nucleotide sequencing of their envelope (E) protein regions. Prolonged passage in mosquito cells caused loss of neuroinvasiveness and acquisition of an N-linked glycosylation site, which is utilized. Limited passage in cell culture also caused glycosylation but not attenuation, suggesting that glycosylation may not be directly responsible for attenuation and that a second mutation (L68 --> P) may also be involved. A monoclonal antibody-neutralization escape mutant with a substitution at residue 307, a site common to other flavivirus escape mutants, was also attenuated. A partially neuroinvasive revertant regained the parental E sequence, implying that determinants outside of the E region may also influence attenuation. Data suggest that the neuroinvasive determinants may be similar to those for other flaviviruses. Also, sequence comparison with the WN virus (Nigeria) strain revealed considerable divergence of the E protein at the nucleotide and amino acid levels.
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