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- W2048804569 abstract "Human cytomegalovirus (HCMV) down-regulates cell surface expression of HLA class I molecules (HLA-I). UL18, an HCMV-encoded HLA-I homologue, has been proposed to protect virus-infected cells against NK cell recognition by engaging the inhibitory receptor leukocyte Ig-like receptor (LIR)-1, which also binds a broad spectrum of HLA-I alleles, including HLA-G1. Because genetic and biological differences exist among HCMV strains, we characterized laboratory (AD169) and clinical (4636, 13B, 109B) strain-derived UL18 proteins. Compared to the known AD169-derived UL18, mutations were found in clinical strain-derived UL18. They were clustered in the alpha3 domain (13B), previously shown to be critical for LIR-1 binding, or in the alpha1 domain (4636). Iotan cytotoxicity assays, pretreatment of LIR-1+ NKL with soluble 4636-UL18 completely abolished LIR-1-dependent protection from NK lysis, conferred by the expression of HLA-G1 on target cells (721.221-HLA-G1+). Similarly, flow cytometry, Biacore and ELISA experiments showed 4636-UL18 and 13B-UL18 to have the strongest binding capacity to LIR-1. Our results suggest the importance of two independent UL18 regions for LIR-1 binding, one localized on the tip of the alpha3 domain, and another composed of two loops that emerge from the alpha1 domain. Strain variations in these domains may result in different UL18-mediated effects on LIR-1+ cells during the course of HCMV infection." @default.
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- W2048804569 date "2006-03-01" @default.
- W2048804569 modified "2023-09-30" @default.
- W2048804569 title "Spontaneous mutations in the human CMV HLA class I homologue UL18 affect its binding to the inhibitory receptor LIR-1/ILT2/CD85j" @default.
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- W2048804569 doi "https://doi.org/10.1002/eji.200425220" @default.
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