Atomic structure of the 26S proteasome lid reveals the mechanism of deubiquitinase inhibition

Details

• Alternative Title:
  eLife
• Personal Author:
  Dambacher, Corey M ; Worden, Evan J ; Herzik, Mark A ; Martin, Andreas ; Lander, Gabriel C
• Description:
  The 26S proteasome is responsible for the selective, ATP-dependent degradation of polyubiquitinated cellular proteins. Removal of ubiquitin chains from targeted substrates at the proteasome is a prerequisite for substrate processing and is accomplished by Rpn11, a deubiquitinase within the 'lid' sub-complex. Prior to the lid's incorporation into the proteasome, Rpn11 deubiquitinase activity is inhibited to prevent unwarranted deubiquitination of polyubiquitinated proteins. Here we present the atomic model of the isolated lid sub-complex, as determined by cryo-electron microscopy at 3.5 Å resolution, revealing how Rpn11 is inhibited through its interaction with a neighboring lid subunit, Rpn5. Through mutagenesis of specific residues, we describe the network of interactions that are required to stabilize this inhibited state. These results provide significant insight into the intricate mechanisms of proteasome assembly, outlining the substantial conformational rearrangements that occur during incorporation of the lid into the 26S holoenzyme, which ultimately activates the deubiquitinase for substrate degradation.
• Subjects:
  Cryoelectron Microscopy Deubiquitinating Enzymes DNA Mutational Analysis Models, Molecular Proteasome Endopeptidase Complex Saccharomyces Cerevisiae
• Source:
  eLife. 2016; 5.
• Pubmed ID:
  26744777
• Pubmed Central ID:
  PMC4749569
• Document Type:
  Journal Article
• Funding:
  DP2 EB020402-01/DP/NCCDPHP CDC HHS/United States ; R01-GM094497/GM/NIGMS NIH HHS/United States
• Volume:
  5
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha-512:bf084c289e4b6e17d644b17a9168e25deb6abd2619ed741810d935328dbb090de0b43e2e925247063eb8fc9b9640e2dd36b54f7ba5d673b2a0745137c7b96dcc
• Download URL:
  https://stacks.cdc.gov/view/cdc/41024/cdc_41024_DS1.pdf
• File Type:
  [PDF - 2.88 MB ]