ULBPs, novel MHC class I-related molecules, bind to CMV glycoprotein UL16 and stimulate NK cytotoxicity through the NKG2D receptor.
The human cytomegalovirus glycoprotein, UL16, binds to two members of a novel family of molecules, the ULBPs, and to the MHC class I homolog, MICB. The ULBPs are GPI-linked glycoproteins belonging to the extended MHC class I family but are only distantly related to MICB. The ULBP and MICB molecules are ligands for the activating receptor, NKG2D/DAP10, and this interaction is blocked by a soluble form of UL16. The ULBPs stimulate cytokine and chemokine production from NK cells, and expression of ULBPs in NK cell-resistant target cells confers susceptibility to NK cell cytotoxicity. Masking of NK cell recognition of ULBP or MIC antigens by UL16 provides a potential mechanism by which human cytomegalovirus-infected cells might evade attack by the immune system.
Cosman
D
D
Department of Molecular Biology, Immunex Corporation, 51 University Street, Seattle, WA 98101, USA.cosman@immunex.com
Müllberg
J
J
Sutherland
C L
CL
Chin
W
W
Armitage
R
R
Fanslow
W
W
Kubin
M
M
Chalupny
N J
NJ
D000595:Amino Acid Sequence; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D002460:Cell Line; D003587:Cytomegalovirus / Q000276:immunology* / Q000378:metabolism* / Q000472:pathogenicity; D003602:Cytotoxicity, Immunologic; D017931:DNA Primers / Q000235:genetics; D058851:GPI-Linked Proteins; D006023:Glycoproteins / Q000276:immunology / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D047908:Intracellular Signaling Peptides and Proteins; D007694:Killer Cells, Natural / Q000276:immunology*; D008024:Ligands; D008565:Membrane Proteins; D008969:Molecular Sequence Data; D055655:NK Cell Lectin-Like Receptor Subfamily K; D011971:Receptors, Immunologic / Q000378:metabolism*; D055607:Receptors, Natural Killer Cell; D017386:Sequence Homology, Amino Acid; D014764:Viral Proteins / Q000276:immunology* / Q000378:metabolism*
D002352:Carrier Proteins; D017931:DNA Primers; D058851:GPI-Linked Proteins; D006023:Glycoproteins; D015395:Histocompatibility Antigens Class I; D036341:Intercellular Signaling Peptides and Proteins; D047908:Intracellular Signaling Peptides and Proteins; C527085:KLRK1 protein, human; D008024:Ligands; C098080:MICB antigen; D008565:Membrane Proteins; D055655:NK Cell Lectin-Like Receptor Subfamily K; D011971:Receptors, Immunologic; D055607:Receptors, Natural Killer Cell; C423231:ULBP1 protein, human; C423230:ULBP2 protein, human; C423229:ULBP3 protein, human; D014764:Viral Proteins