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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The human cytomegalovirus US11 gene product dislocates MHC class I heavy chains from the endoplasmic reticulum to the cytosol.

Human cytomegalovirus (HCMV) down-regulates expression of MHC class I products by selective proteolysis. A single HCMV gene, US11, which encodes an endoplasmic reticulum (ER) resident type-I transmembrane glycoprotein, is sufficient to cause this effect. In US11+cells, MHC class I molecules are core-glycosylated and therefore inserted into the ER. They are degraded with a half-time of less than 1 min. A full length breakdown intermediate that has lost the single N-linked glycan in an N-glycanase-catalyzed reaction transiently accumulates in cells exposed to the protease inhibitors LLnL, Cbz-LLL, and lactacystin, identifying the proteasome as a key protease. Subcellular fractionation experiments show this intermediate to be cytosolic. Thus, US11 dislocates newly synthesized class I molecules from the ER to the cytosol, where they are acted upon by an N-glycanase and the proteasome.[1]

References

  1. The human cytomegalovirus US11 gene product dislocates MHC class I heavy chains from the endoplasmic reticulum to the cytosol. Wiertz, E.J., Jones, T.R., Sun, L., Bogyo, M., Geuze, H.J., Ploegh, H.L. Cell (1996) [Pubmed]
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