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Distinct modes of regulation of the Uch37 deubiquitinating enzyme in the proteasome and in the Ino80 chromatin-remodeling complex.


ABSTRACT: Deubiquitinating enzymes (DUBs) are proteases that can antagonize ubiquitin-mediated signaling by disassembling ubiquitin-protein conjugates. How DUBs are regulated in vivo and how their substrate specificities are achieved are largely unknown. The conserved DUB Uch37 is found on proteasomes in organisms ranging from fission yeast to humans. Deubiquitination by Uch37 is activated by proteasomal binding, which enables Uch37 to process polyubiquitin chains. Here we show that in the nucleus Uch37 is also associated with the human Ino80 chromatin-remodeling complex (hINO80). In hINO80, Uch37 is held in an inactive state; however, it can be activated by transient interaction of the Ino80 complex with the proteasome. Thus, DUB activities can be modulated both positively and negatively via dynamic interactions with partner proteins. In addition, our findings suggest that the proteasome and the hINO80 chromatin-remodeling complex may cooperate to regulate transcription or DNA repair, processes in which both complexes have been implicated.

SUBMITTER: Yao T 

PROVIDER: S-EPMC2577292 | biostudies-literature | 2008 Sep

REPOSITORIES: biostudies-literature

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Distinct modes of regulation of the Uch37 deubiquitinating enzyme in the proteasome and in the Ino80 chromatin-remodeling complex.

Yao Tingting T   Song Ling L   Jin Jingji J   Cai Yong Y   Takahashi Hidehisa H   Swanson Selene K SK   Washburn Michael P MP   Florens Laurence L   Conaway Ronald C RC   Cohen Robert E RE   Conaway Joan W JW  

Molecular cell 20080901 6


Deubiquitinating enzymes (DUBs) are proteases that can antagonize ubiquitin-mediated signaling by disassembling ubiquitin-protein conjugates. How DUBs are regulated in vivo and how their substrate specificities are achieved are largely unknown. The conserved DUB Uch37 is found on proteasomes in organisms ranging from fission yeast to humans. Deubiquitination by Uch37 is activated by proteasomal binding, which enables Uch37 to process polyubiquitin chains. Here we show that in the nucleus Uch37 i  ...[more]

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