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

Temperature-sensitive mutants of avian erythroblastosis virus: surface expression of the erbB product correlates with transformation.

The v-erbB gene of avian erythroblastosis virus (AEV) codes for an integral plasma membrane glycoprotein, gp74erbB. Expression of gp74erbB and its intracellular precursors, gp66erbB and gp68erbB, has been studied in cells transformed by two temperature-sensitive mutants of AEV. After shift to 42 degrees C, the processing of gp68erbB is blocked in tsAEV-transformed, but not in wtAEV-transformed, erythroblasts and fibroblasts. In addition, gp74erbB disappears from the surface of tsAEV cells within 12 hr after shift. Thus tsAEV mutants probably bear a lesion in v-erbB that affects the maturation and subcellular localization of gp74erbB. The tsAEV erythroblasts, when "committed" to differentiation by a pulse-shift to 42 degrees C, reexpress gp74erbB during terminal differentiation at 36 degrees C. This suggests that tsAEV erythroblasts become insensitive to the transforming functions of gp74erbB at a certain stage of differentiation.[1]


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