1887

Journal of General Virology

Volume 92, Issue 1

Lysine residues of interferon regulatory factor 7 affect the replication and transcription activator-mediated lytic replication of Kaposi's sarcoma-associated herpesvirus/human herpesvirus 8 Free

Abstract

Kaposi's sarcoma-associated herpesvirus (KSHV) infection goes through latent and lytic phases, which are controlled by the viral replication and transcription activator (RTA). Upon KSHV infection, the host responds by suppressing RTA-activated lytic gene expression through interferon regulatory factor 7 (IRF-7), a key regulator of host innate immune response. Lysine residues are potential sites for post-translational modification of IRF-7, and were suggested to be critical for its activity. In this study, we analysed the 15 lysine residues for their effects on IRF-7 function by site-directed mutagenesis. We found that some mutations affect the ability of IRF-7 to activate interferon (IFN)-1 and IFN- promoters, to suppress RTA-mediated lytic gene expression and to repress KSHV reactivation and lytic replication. However, other mutations affect only a subset of these four functions. These findings demonstrate that the lysine residues of IRF-7 play important roles in mediating IFN synthesis and modulating viral lytic replication.

  • Received:
  • Accepted:
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2011-01-01
2021-03-06
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Lysine residues of interferon regulatory factor 7 affect the replication and transcription activator-mediated lytic replication of Kaposi's sarcoma-associated herpesvirus/human herpesvirus 8
J. Gen. Virol. 92, 181 (2011); https://doi.org/10.1099/vir.0.021816-0
/content/journal/jgv/10.1099/vir.0.021816-0
/content/journal/jgv/10.1099/vir.0.021816-0
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vol. , part 12, pp. 181–187

Primers used for the mutagenesis of IRF-7.

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