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- W2012350574 abstract "Hematopoietic cytokine receptors, such as the erythropoietin receptor (EpoR), are single membrane-spanning proteins. Signal transduction through EpoR is crucial for the formation of mature erythrocytes. Structural evidence shows that in the unliganded form EpoR exists as a preformed homodimer in an open scissor-like conformation precluding the activation of signaling. In contrast to the extracellular domain of the growth hormone receptor (GHR), the structure of the agonist-bound EpoR extracellular region shows only minimal contacts between the membrane-proximal regions. This evidence suggests that the domains facilitating receptor dimerization may differ between cytokine receptors. We show that the EpoR transmembrane domain (TM) has a strong potential to self interact in a bacterial reporter system. Abolishing self assembly of the EpoR TM by a double point mutation (Leu 240-Leu 241 mutated to Gly-Pro) impairs signal transduction by EpoR in hematopoietic cells and the formation of erythroid colonies upon reconstitution in erythroid progenitor cells from EpoR(-/-) mice. Interestingly, inhibiting TM self assembly in the constitutively active mutant EpoR R129C abrogates formation of disulfide-linked receptor homodimers and consequently results in the loss of ligand-independent signal transduction. Thus, efficient signal transduction through EpoR and possibly other preformed receptor oligomers may be determined by the dynamics of TM self assembly." @default.
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- W2012350574 date "2001-01-01" @default.
- W2012350574 modified "2023-10-13" @default.
- W2012350574 title "Self assembly of the transmembrane domain promotes signal transduction through the erythropoietin receptor" @default.
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- W2012350574 doi "https://doi.org/10.1016/s0960-9822(01)00018-5" @default.
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