Journal
VIRUSES-BASEL
Volume 12, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/v12090925
Keywords
Zika virus; N-glycosylation; pre-membrane; envelope; virus life cycle
Categories
Funding
- Umea Centre for Microbial Research
- Swedish Research Council [2018-02637]
- County Councils of Northern Sweden
- Laboratory for Molecular Infection Medicine Sweden (MIMS)
- Swedish Research Council [2018-02637] Funding Source: Swedish Research Council
- Formas [2018-02637] Funding Source: Formas
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Asparagine (N)-linked protein glycosylation plays an important role in protein synthesis and modification. Two Zika virus (ZIKV) structural proteins, the pre-membrane (prM) and envelope (E) protein areN-glycosylated. The prM protein of all ZIKV strains contains a singleN-linked glycosylation site, while not all strains contain an N-linked site in the E protein. Our aim was to examine the impact of prM and E N-linked glycosylation on ZIKV infectivity and cell trafficking. Using a ZIKV infectious clone, we found that when theN-glycan sites were removed, the prM- and the prM/E-double mutants did not produce an infectious virus in the supernatant. Further, by using ZIKV prME constructs, we found thatN-glycosylation was necessary for effective secretion of ZIKV virions. The absence of theN-glycan on prM or E caused protein aggregation in the rough endoplasmatic reticulum (ER) compartment. The aggregation was more pronounced for the prM-mutation, and the mutant virus lost the ER-Golgi intermediate compartment (ERGIC) localization. In addition, lack of theN-glycan on prM induced nuclear translocation of CCAAT-enhancer-binding protein homologous protein (CHOP), an ER stress marker. To conclude, we show that the prMN-glycan is essential for the ZIKV infectious cycle, and plays an important role in viral protein trafficking, protein folding, and virion assembly.
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