Linked Life Data

16005295

Source:http://linkedlifedata.com/resource/pubmed/id/16005295

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pubmed-article:16005295pubmed:abstractTextThe COP9 signalosome (CSN) is a conserved protein complex found in all eukaryotic cells and involved in the regulation of the ubiquitin (Ub)/26S proteasome system. It binds numerous proteins, including the Ub E3 ligases and the deubiquitinating enzyme Ubp12p, the S. pombe ortholog of human USP15. We found that USP15 copurified with the human CSN complex. Isolated CSN complex exhibited protease activity that deubiquitinated poly-Ub substrates and was completely inhibited by o-phenanthroline (OPT), a metal-chelating agent. Surprisingly, the recombinant USP15 was also not able to cleave isopeptide bonds of poly-Ub chains in presence of OPT. Detailed analysis of USP sequences led to the discovery of a novel zinc (Zn) finger in USP15 and related USPs. Mutation of a single conserved cysteine residue in the predicted Zn binding motif resulted in the loss of USP15 capability to degrade poly-Ub substrates, indicating that the Zn finger is essential for the cleavage of poly-Ub chains. Moreover, pulldown experiments demonstrated diminished binding of tetra-Ub to mutated USP15. Cotransfection of USP15 and the Ub ligase Rbx1 revealed that the wild-type deubiquitinating enzyme, but not the USP15 mutant with a defective Zn finger, stabilized Rbx1 toward the Ub system, most likely by reversing poly/autoubiquitination. In summary, a functional Zn finger of USP15 is needed to maintain a conformation essential for disassembling poly-Ub chains, a prerequisite for rescuing the E3 ligase Rbx1.lld:pubmed
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pubmed-article:16005295pubmed:articleTitleThe zinc finger of the CSN-associated deubiquitinating enzyme USP15 is essential to rescue the E3 ligase Rbx1.lld:pubmed
pubmed-article:16005295pubmed:affiliationDivision of Molecular Biology, Department of Surgery, Charité, Universitätsmedizin Berlin, Monbijoustrasse 2, 10117 Berlin, Germany. bettina.hetfeld@charite.delld:pubmed
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