Binding STAT2 by the acidic domain of human cytomegalovirus IE1 promotes viral growth and is negatively regulated by SUMO

Ho Huh Yong, Eui Kim Young, Tae Kim Eui, Jin Park Jung, Moon Jung Song, Hua Zhu, Gary S. Hayward, Jin Hyun Ahn

Research output: Contribution to journalArticle

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Abstract

The human cytomegalovirus (HCMV) 72-kDa immediate-early 1 (IE1) protein is thought to modulate cellular antiviral functions impacting on promyelocytic leukemia (PML) nuclear bodies and signal transducer and activator of transcription (STAT) signaling. IE1 consists of four distinct regions: an amino-terminal region required for nuclear localization, a large central hydrophobic region responsible for PML targeting and transactivation activity, an acidic domain, and a carboxyl-terminal chromatin tethering domain. We found that the acidic domain of IE1 is required for binding to STAT2. A mutant HCMV encoding IE1(Δ421-475) with the acidic domain deleted was generated. In mutant virus-infected cells, IE1(Δ421-475) failed to bind to STAT2. The growth of mutant virus was only slightly delayed at a high multiplicity of infection (MOI) but was severely impaired at a low MOI with low-level accumulation of viral proteins. When cells were pretreated with beta interferon, the mutant virus showed an additional 1,000-fold reduction in viral growth, even at a high MOI, compared to the wild type. The inhibition of STAT2 loading on the target promoter upon infection was markedly reduced with mutant virus. Furthermore, sumoylation of IE1 at this acidic domain was found to abolish the activity of IE1 to bind to STAT2 and repress the interferon-stimulated genes. Our results provide genetic evidence that IE1 binding to STAT2 requires the 55-amino-acid acidic domain and promotes viral growth by interfering with interferon signaling and demonstrate that this viral activity is negatively regulated by a cellular sumoylation pathway.

Original languageEnglish
Pages (from-to)10444-10454
Number of pages11
JournalJournal of Virology
Volume82
Issue number21
DOIs
Publication statusPublished - 2008 Nov 1

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Cytomegalovirus
Sumoylation
Viruses
Growth
Infection
Interferons
Leukemia
Immediate-Early Proteins
Acidic Amino Acids
Interferon-beta
Viral Proteins
Transducers
Transcriptional Activation
Chromatin
Antiviral Agents
Genes

ASJC Scopus subject areas

  • Immunology
  • Virology

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Binding STAT2 by the acidic domain of human cytomegalovirus IE1 promotes viral growth and is negatively regulated by SUMO. / Yong, Ho Huh; Young, Eui Kim; Eui, Tae Kim; Jung, Jin Park; Song, Moon Jung; Zhu, Hua; Hayward, Gary S.; Ahn, Jin Hyun.

In: Journal of Virology, Vol. 82, No. 21, 01.11.2008, p. 10444-10454.

Research output: Contribution to journalArticle

Yong, Ho Huh ; Young, Eui Kim ; Eui, Tae Kim ; Jung, Jin Park ; Song, Moon Jung ; Zhu, Hua ; Hayward, Gary S. ; Ahn, Jin Hyun. / Binding STAT2 by the acidic domain of human cytomegalovirus IE1 promotes viral growth and is negatively regulated by SUMO. In: Journal of Virology. 2008 ; Vol. 82, No. 21. pp. 10444-10454.
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