1887

Abstract

Kaposi’s sarcoma-associated herpesvirus (KSHV) is an oncogenic etiological factor for Kaposi’s sarcoma and primary effusion lymphoma in immunocompromised patients. KSHV utilizes two immune evasion E3 ubiquitin ligases, namely K3 and K5, to downregulate the expression of antigen-presenting molecules and ligands of natural killer (NK) cells in the host cells through an ubiquitin-dependent endocytic mechanism. This allows the infected cells to evade surveillance and elimination by cytotoxic lymphocytes and NK cells. The number of host cell molecular substrates reported for these ubiquitin ligases is limited. The identification of novel substrates for these ligases will aid in elucidating the mechanism underlying immune evasion of KSHV. This study demonstrated that K5 downregulated the cell surface expression of -selectin, a C-type lectin-like adhesion receptor expressed in the lymphocytes. Tryptophan residue located at the centre of the E2-binding site in the K5 RINGv domain was essential to downregulate -selectin expression. Additionally, the lysine residues located at the cytoplasmic tail of -selectin were required for the K5-mediated downregulation of -selectin. K5 promoted the degradation of -selectin through polyubiquitination. These results suggest that K5 downregulates -selectin expression on the cell surface by promoting polyubiquitination and ubiquitin-dependent endocytosis, which indicated that -selectin is a novel substrate for K5. Additionally, K3 downregulated -selectin expression. The findings of this study will aid in the elucidation of a novel immune evasion mechanism in KSHV.

Funding
This study was supported by the:
  • Showa Pharmaceutical University (Award Grant-in-Aid for Young Scientists)
    • Principle Award Recipient: MizuhoKajikawa
  • Ministry of Education, Culture, Sports, Science and Technology (Award Supported Program for the Strategic Research Foundation at Private Universities)
    • Principle Award Recipient: MizuhoKajikawa
  • Japan Society for the Promotion of Science (Award 15K08504)
    • Principle Award Recipient: MizuhoKajikawa
  • Japan Society for the Promotion of Science (Award 19K07595)
    • Principle Award Recipient: MizuhoKajikawa
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/content/journal/jgv/10.1099/jgv.0.001678
2021-11-02
2024-06-17
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