Cited by 24Herpesvirus Infections and TreatmentsCellular transport and secretionCytomegalovirus and herpesvirus research

Major histocompatibility complex class I downregulation induced by equine herpesvirus type 1 pUL56 is through dynamin-dependent endocytosis.

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Huang, Teng, Lehmann, Maik J., Said, Abdelrahman, Ma, Guanggang, Osterrieder, Nikolaus·2014·Journal of Virology

Abstract

UNLABELLED: Equine herpesvirus type 1 (EHV-1) downregulates cell surface expression of major histocompatibility complex class I (MHC-I) in infected cells. We have previously shown that pUL56 encoded by the EHV-1 ORF1 gene regulates the process (G. Ma, S. Feineis, N. Osterrieder, and G. R. Van de Walle, J. Virol. 86:3554-3563, 2012, doi:http://dx.doi.org/10.1128/JVI.06994-11). Here, we report that cell surface MHC-I in EHV-1-infected cells is internalized and degraded in the lysosomal compartment in a pUL56-dependent fashion. pUL56-induced MHC-I endocytosis required dynamin and tyrosine kinase but was independent of clathrin and caveolin-1, the main constituents of the clathrin- and raft/caveola-mediated endocytosis pathways, respectively. Downregulation of cell surface MHC-I was significantly inhibited by the ubiquitin-activating enzyme E1 inhibitor PYR41, indicating that ubiquitination is essential for the process. Finally, we show that downregulation is not specific for MHC-I and that other molecules, including CD46 and CD63, are also removed from the cell surface in a pUL56-dependent fashion. IMPORTANCE: We show that alphaherpesvirus induces MHC-I downregulation through endocytosis, which is mediated by pUL56. The dynamin-dependent endocytic pathway is responsible for MHC-I internalization in infected cells. Furthermore, we discovered that this endocytic process can be disrupted by the inhibiting ubiquitin-activating E1 enzyme, which is indispensable for ubiquitination. Finally, pUL56 action extends to a number of cell surface molecules that are significant for host immunity. Therefore, the protein may exert a more general immunomodulatory effect.

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Crossref · 10.1128/jvi.02079-14

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Authors
Huang, T., Lehmann, M. J., Said, A., Ma, G., & Osterrieder, N.
Affiliations
  • Freie Universität Berlin (DE)
  • Humboldt-Universität zu Berlin (DE)
  • National Research Centre (EG)
Venue
Journal of Virology
Published
2014-11
Volume
88
Issue
21
Pages
12802-12815
ISSN
  • 0022-538X (ISSN-L)
  • 1098-5514
OpenAlex
W1977148409
Cited by
24
References
74
Citations by year
2026: 3 · 2025: 2 · 2022: 1 · 2021: 1 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 3 · 2015: 7 · 2014: 1
FWCI
3.02
Type
journal article
Language
en
Open access
Locations
  • Journal of Virology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Herpesvirus Infections and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Epidemiology › Cytomegalovirus and herpesvirus research
Keywords
equine herpesvirus 1, MHC class I downregulation, dynamin-dependent endocytosis, viral immunomodulation, ubiquitination, CD46, CD63, lysosomal degradation, alphaherpesvirus
MeSH terms
Animals, Cell Line, Endocytosis, Herpesvirus 1, Equid, Fibroblasts, Horses, Humans, Viral Proteins, Histocompatibility Antigens Class I, Down-Regulation, Dynamins, Host-Pathogen Interactions, Immune Evasion

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