7LSX

Cryo-EM structure of 13S proteasome core particle assembly intermediate purified from Pre3-1 proteasome mutant (G34D)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.61 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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Literature

Structures of chaperone-associated assembly intermediates reveal coordinated mechanisms of proteasome biogenesis.

Schnell, H.M.Walsh Jr., R.M.Rawson, S.Kaur, M.Bhanu, M.K.Tian, G.Prado, M.A.Guerra-Moreno, A.Paulo, J.A.Gygi, S.P.Roelofs, J.Finley, D.Hanna, J.

(2021) Nat Struct Mol Biol 28: 418-425

  • DOI: https://doi.org/10.1038/s41594-021-00583-9
  • Primary Citation of Related Structures:  
    7LS5, 7LS6, 7LSX

  • PubMed Abstract: 

    The proteasome mediates most selective protein degradation. Proteolysis occurs within the 20S core particle (CP), a barrel-shaped chamber with an α 7 β 7 β 7 α 7 configuration. CP biogenesis proceeds through an ordered multistep pathway requiring five chaperones, Pba1-4 and Ump1. Using Saccharomyces cerevisiae, we report high-resolution structures of CP assembly intermediates by cryogenic-electron microscopy. The first structure corresponds to the 13S particle, which consists of a complete α-ring, partial β-ring (β2-4), Ump1 and Pba1/2. The second structure contains two additional subunits (β5-6) and represents a later pre-15S intermediate. These structures reveal the architecture and positions of Ump1 and β2/β5 propeptides, with important implications for their functions. Unexpectedly, Pba1's N terminus extends through an open CP pore, accessing the CP interior to contact Ump1 and the β5 propeptide. These results reveal how the coordinated activity of Ump1, Pba1 and the active site propeptides orchestrate key aspects of CP assembly.


  • Organizational Affiliation

    Department of Pathology, Harvard Medical School and Brigham and Women's Hospital, Boston, MA, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-1252Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-2250Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-3258Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-4254Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-5260Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-6234Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-7288Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome maturation factor UMP1148Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-2261Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-3205Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-4198Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome chaperone 1L [auth O]276Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome assembly chaperone 2M [auth P]267Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.61 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC2.15.0
MODEL REFINEMENTPHENIX1.19.1-4122

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesDP5-OD019800

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-14
    Type: Initial release
  • Version 1.1: 2021-04-28
    Changes: Database references
  • Version 1.2: 2021-05-26
    Changes: Database references
  • Version 1.3: 2024-03-06
    Changes: Data collection, Database references, Refinement description