Fachbereich Veterinärmedizin



    Comparative analysis of glycoprotein B (gB) of equine herpesvirus type 1 and type 4 (EHV-1 and EHV-4) in cellular tropism and cell-to-cell transmission (2015)

    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Spiesschaert, Bart (WE 5)
    Osterrieder, Nikolaus (WE 5)
    Azab, Walid (WE 5)
    Viruses; 7(2) — S. 522–542
    ISSN: 1999-4915
    URL (Volltext): http://edocs.fu-berlin.de/docs/receive/FUDOCS_document_000000021934
    DOI: 10.3390/v7020522
    Pubmed: 25654240
    Institut für Virologie

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    Abstract / Zusammenfassung

    Glycoprotein B (gB) plays an important role in alphaherpesvirus cellular entry and acts in concert with gD and the gH/gL complex. To evaluate whether functional differences exist between gB1 and gB4, the corresponding genes were exchanged between the two viruses. The gB4-containing-EHV-1 (EHV-1_gB4) recombinant virus was analyzed for growth in culture, cell tropism, and cell entry rivaling no significant differences when compared to parental virus. We also disrupted a potential integrin-binding motif, which did not affect the function of gB in culture. In contrast, a significant reduction of plaque sizes and growth kinetics of gB1-containing-EHV-4 (EHV-4_gB1) was evident when compared to parental EHV-4 and revertant viruses. The reduction in virus growth may be attributable to the loss of functional interaction between gB and the other envelope proteins involved in virus entry, including gD and gH/gL. Alternatively, gB4 might have an additional function, required for EHV-4 replication, which is not fulfilled by gB1. In conclusion, our results show that the exchange of gB between EHV-1 and EHV-4 is possible, but results in a significant attenuation of virus growth in the case of EHV-4_gB1. The generation of stable recombinant viruses is a valuable tool to address viral entry in a comparative fashion and investigate this aspect of virus replication further.