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• W2808097834 abstract "ABSTRACT Orthologs of the herpes simplex virus (HSV) UL16 gene are conserved throughout the Herpesviridae . Because of this conservation, one might expect that the proteins perform similar functions for all herpesviruses. Previous studies on a UL16 -null mutant derived from HSV-2 strain 186 revealed a roughly 100-fold replication defect and a critical role for UL16 in the nuclear egress of capsids. These findings were in stark contrast to what has been observed with UL16 mutants of HSV-1 and pseudorabies virus, where roughly 10-fold replication deficiencies that were accompanied by defects in the secondary envelopment of cytoplasmic capsids were reported. One possible explanation for this discrepancy is that HSV-2 strain 186 is not representative of the HSV-2 species. To address this possibility, multiple UL16 -null mutants were constructed in multiple HSV-2 and HSV-1 strains by CRISPR/Cas9 mutagenesis, and their phenotypes were characterized side by side. This analysis showed that all the HSV-2 UL16 mutants had 50- to 100-fold replication deficiencies that were accompanied by defects in the nuclear egress of capsids, as well as defects in the secondary envelopment of cytoplasmic capsids. By contrast, most HSV-1 UL16 mutants had 10-fold replication deficiencies that were accompanied by defects in secondary envelopment of cytoplasmic capsids. These findings indicated that UL16 has HSV species-specific functions. Interestingly, HSV-1 UL16 could promote the nuclear egress of HSV-2 UL16 -null strains, suggesting that, unlike HSV-1, HSV-2 lacks an activity that can promote nuclear egress in the absence of UL16. IMPORTANCE HSV-2 and HSV-1 are important human pathogens that cause distinct diseases in their hosts. A complete understanding of the morphogenesis of these viruses is expected to reveal vulnerabilities that can be exploited in the treatment of HSV disease. UL16 is a virion structural component that is conserved throughout the Herpesviridae and functions in virus morphogenesis; however, previous studies have suggested different roles for UL16 in the morphogenesis of HSV-2 and HSV-1. This study sought to resolve this apparent discrepancy by analyzing multiple UL16 mutant viruses derived from multiple strains of HSV-2 and HSV-1. The data indicate that UL16 has HSV species-specific functions, as HSV-2 has a requirement for UL16 in the escape of capsids from the nucleus whereas both HSV-2 and HSV-1 require UL16 for final envelopment of capsids at cytoplasmic membranes." @default.
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• W2808097834 date "2018-07-01" @default.
• W2808097834 modified "2023-10-16" @default.
• W2808097834 title "Comparative Analysis of <i>UL16</i> Mutants Derived from Multiple Strains of Herpes Simplex Virus 2 (HSV-2) and HSV-1 Reveals Species-Specific Requirements for the UL16 Protein" @default.
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• W2808097834 doi "https://doi.org/10.1128/jvi.00629-18" @default.
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