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. 1990 Jun;87(11):4139–4143. doi: 10.1073/pnas.87.11.4139

Friend spleen focus-forming virus glycoprotein gp55 interacts with the erythropoietin receptor in the endoplasmic reticulum and affects receptor metabolism.

A Yoshimura 1, A D D'Andrea 1, H F Lodish 1
PMCID: PMC54063  PMID: 2161534

Abstract

The Friend spleen focus-forming virus envelope glycoprotein, gp55, binds to the murine erythropoietin receptor (EPO-R) and triggers growth activation in the absence of EPO. Interleukin 3-dependent lymphoid cell lines that have been stably transfected with the EPO-R cDNA grow in the presence of EPO or interleukin 3. In these cells, the EPO-R is synthesized as a minor 62-kDa unglycosylated form and a major 64-kDa form carrying one high-mannose N-linked oligosaccharide. A fraction of the 64-kDa form is processed to a 66-kDa species with complex-type sugars. Very little of the EPO-R is expressed on the cell surface and all three forms of EPO-R are degraded rapidly. Cells transfected with both EPO-R and gp55 cDNAs grow in the absence of EPO. Most of the EPO-R associated with gp55 is endoglycosidase H-sensitive, suggesting that the interactions between these proteins occur in the endoplasmic reticulum. Furthermore, the endoglycosidase H-sensitive EPO-R is more stable than in the absence of gp55, a result suggesting that interaction of gp55 with the EPO-R causes it to remain within the rough endoplasmic reticulum. It is possible that gp55 EPO-R complexes within this compartment send a growth-promoting signal to the cell.

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