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

A sorting motif localizes the foamy virus glycoprotein to the endoplasmic reticulum.

We recently identified an endoplasmic reticulum (ER) retrieval signal-the dilysine motif-in the glycoproteins of all five foamy viruses (FVs) for which sequences were available (P. A. Goepfert, G. Wang, and M. J. Mulligan, Cell 82:543-544, 1995). In the present study, expression of recombinant human FV (HFV) glycoprotein and analyses of oligosaccharide modifications and precursor cleavage indicated that the protein was localized to the ER. HFV glycoproteins encoding seven different dilysine motif mutations were then expressed. The results indicated that disruptions of the dilysine motif resulted in higher levels of forward transport of the HFV glycoprotein from the ER through the Golgi apparatus to the plasma membrane. We conclude that the dilysine motif is responsible for ER sorting of the FV glycoprotein. Signal-mediated ER localization has not previously been described for a retroviral glycoprotein.[1]


  1. A sorting motif localizes the foamy virus glycoprotein to the endoplasmic reticulum. Goepfert, P.A., Shaw, K.L., Ritter, G.D., Mulligan, M.J. J. Virol. (1997) [Pubmed]
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