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• W2170432403 abstract "The human cytomegalovirus (HCMV) glycoprotein US11 diverts class I major histocompatibility complex (MHC) heavy chains (HC) from the endoplasmic reticulum (ER) to the cytosol, where HC are subjected to proteasome-mediated degradation. In mouse embryonic fibroblasts that are deficient for X-box binding protein 1 (XBP-1), a key transcription factor in the unfolded protein response (UPR) pathway, we show that degradation of endogenous mouse HC is impaired. Moreover, the rate of US11-mediated degradation of ectopically expressed HLA-A2 is reduced when XBP-1 is absent. In the human astrocytoma cell line U373, turning on expression of US11, but not US2, is sufficient to induce a UPR, as manifested by upregulation of the ER chaperone Bip and by splicing of XBP-1 mRNA. In the presence of dominant-negative versions of XBP-1 and activating transcription factor 6, the kinetics of class I MHC HC degradation were delayed when expression of US11 was turned on. The magnitude of these effects, while reproducible, was modest. Conversely, in cells that stably express high levels of US11, the degradation of HC is not affected by the presence of the dominant negative effectors of the UPR. An infection of human foreskin fibroblasts with human cytomegalovirus induced XBP-1 splicing in a manner that coincides with US11 expression. We conclude that the contribution of the UPR is more pronounced on HC degradation shortly after induction of US11 expression and that US11 is sufficient to induce such a response." @default.
• W2170432403 created "2016-06-24" @default.
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• W2170432403 date "2005-03-01" @default.
• W2170432403 modified "2023-09-28" @default.
• W2170432403 title "Human Cytomegalovirus Protein US11 Provokes an Unfolded Protein Response That May Facilitate the Degradation of Class I Major Histocompatibility Complex Products" @default.
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• W2170432403 doi "https://doi.org/10.1128/jvi.79.5.2768-2779.2005" @default.
• W2170432403 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/548438" @default.
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