Role of Rpn11 metalloprotease in deubiquitination and degradation by the 26S proteasome - PubMed (original) (raw)

. 2002 Oct 18;298(5593):611-5.

doi: 10.1126/science.1075898. Epub 2002 Aug 15.

Affiliations

• PMID: 12183636
• DOI: 10.1126/science.1075898

Role of Rpn11 metalloprotease in deubiquitination and degradation by the 26S proteasome

Rati Verma et al. Science. 2002.

Abstract

The 26S proteasome mediates degradation of ubiquitin-conjugated proteins. Although ubiquitin is recycled from proteasome substrates, the molecular basis of deubiquitination at the proteasome and its relation to substrate degradation remain unknown. The Rpn11 subunit of the proteasome lid subcomplex contains a highly conserved Jab1/MPN domain-associated metalloisopeptidase (JAMM) motif-EX(n)HXHX(10)D. Mutation of the predicted active-site histidines to alanine (rpn11AXA) was lethal and stabilized ubiquitin pathway substrates in yeast. Rpn11(AXA) mutant proteasomes assembled normally but failed to either deubiquitinate or degrade ubiquitinated Sic1 in vitro. Our findings reveal an unexpected coupling between substrate deubiquitination and degradation and suggest a unifying rationale for the presence of the lid in eukaryotic proteasomes.

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Comment in

• Molecular biology. New proteases in a ubiquitin stew.
  Hochstrasser M. Hochstrasser M. Science. 2002 Oct 18;298(5593):549-52. doi: 10.1126/science.1078097. Science. 2002. PMID: 12386321 No abstract available.

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