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  • Title: Glycosylation of the dengue 2 virus E protein at N67 is critical for virus growth in vitro but not for growth in intrathoracically inoculated Aedes aegypti mosquitoes.
    Author: Bryant JE, Calvert AE, Mesesan K, Crabtree MB, Volpe KE, Silengo S, Kinney RM, Huang CY, Miller BR, Roehrig JT.
    Journal: Virology; 2007 Sep 30; 366(2):415-23. PubMed ID: 17543367.
    Abstract:
    To determine the importance of dengue 2 virus (DEN2V) envelope (E) protein glycosylation, virus mutants in one or both of the N-linked glycosylation motifs were prepared. We found that while the E2 mutant virus (N153Q) replicated in mammalian and mosquito cells, the E1 (N67Q) and E1/2 (N67Q and N153Q) mutant viruses were unable to grow in mammalian cells. Infection of C6/36 mosquito cells with either the E1 or E1/2 mutants resulted in the introduction of a compensatory mutation, K64N, restoring glycosylation in the area. All mutants replicated similarly in inoculated Aedes aegypti mosquitoes, with no change in their mutations. These results suggest that N-linked glycosylation of the E protein is not necessary for DEN2V replication in mosquitoes, however N-linked glycosylation at amino acid N67 (or nearby N64) is critical for the survival of the virus in either mammalian or insect cell culture.
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