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Updated: Jun 5, 2026

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
Ubiquitination regulates the internalization, endolysosomal sorting, and signaling of the erythropoietin receptor
Gamze Betul Bulut1, Rita Sulahian, Yue Ma
1Department of Cell Biology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA.
Abstract:
Ubiquitination is a common mechanism of down-regulation of mitogenic receptors. Here, we show that ubiquitination of the erythropoietin receptor (EpoR) at Lys(256) is necessary and sufficient for efficient Epo-induced receptor internalization, whereas ubiquitination at Lys(428) promotes trafficking of activated receptors to the lysosomes for degradation. Interestingly, EpoR that cannot be ubiquitinated has reduced mitogenic activities and ability to stimulate the STAT5, Ras/MAPK, and PI3K/AKT signaling pathways. We therefore propose that ubiquitination of the EpoR critically controls both receptor down-regulation and downstream signaling.
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