Human cytomegalovirus glycoprotein UL16 causes intracellular sequestration of NKG2D ligands, protecting against natural killer cell cytotoxicity

Claire Dunn, N. Jan Chalupny, Claire L. Sutherland, Stephanie Dosch, P. V. Sivakumar, David C. Johnson, David Cosman

Research output: Contribution to journalArticle

215 Scopus citations


The activating receptor, NKG2D, is expressed on a variety of immune effector cells and recognizes divergent families of major histocompatibility complex (MHC) class I-related ligands, including the MIC and ULBP proteins. Infection, stress, or transformation can induce NKG2D ligand expression, resulting in effector cell activation and killing of the ligand-expressing target cell. The human cytomegalovirus (HCMV) membrane glycoprotein, UL16, binds to three of the five known ligands for human NKG2D. UL16 is retained in the endoplasmic reticulum and cis-Golgi apparatus of cells and causes MICB to be similarly retained and stabilized within cells. Coexpression of UL16 markedly reduces cell surface levels of MICB, ULBP1, and ULBP2, and decreases susceptibility to natural killer cell-mediated cytotoxicity. Domain swapping experiments demonstrate that the transmembrane and cytoplasmic domains of UL16 are important for intracellular retention of UL16, whereas the ectodomain of UL16 participates in down-regulation of NKG2D ligands. The intracellular sequestration of NKG2D ligands by UL16 represents a novel HCMV immune evasion mechanism to add to the well-documented viral strategies directed against antigen presentation by classical MHC molecules.

Original languageEnglish (US)
Pages (from-to)1427-1439
Number of pages13
JournalJournal of Experimental Medicine
Issue number11
StatePublished - Jun 2 2003



  • HCMV
  • MIC
  • NKG2D
  • UL16
  • ULBP

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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