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The 26S proteasome degrades ubiquitinated proteins, and proteasomal degradation controls various cellular events. Here we report that the human 26S proteasome is ubiquitinated, by which the ubiquitin receptors Adrm1 and S5a, the ATPase subunit Rpt5, and the deubiquitinating enzyme Uch37 are ubiquitinated in situ by proteasome-associating ubiquitination(More)
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