8TM4

Human pre 13S proteasome assembly intermediate

  • Classification: HYDROLASE
  • Organism(s): Homo sapiens
  • Mutation(s): No 

  • Deposited: 2023-07-28 Released: 2024-10-23 
  • Deposition Author(s): Zhang, H., Zhao, J.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/Office of the Director, National Institutes of Health/National Cancer Institute (NIH/NCI)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Structural basis of human 20S proteasome biogenesis.

Zhang, H.Zhou, C.Mohammad, Z.Zhao, J.

(2024) Nat Commun 15: 8184-8184

  • DOI: https://doi.org/10.1038/s41467-024-52513-0
  • Primary Citation of Related Structures:  
    8TM3, 8TM4, 8TM5, 8TM6

  • PubMed Abstract: 

    New proteasomes are produced to accommodate increases in cellular catabolic demand and prevent the accumulation of cytotoxic proteins. Formation of the proteasomal 20S core complex relies on the function of the five chaperones PAC1-4 and POMP. Here, to understand how these chaperones facilitate proteasome assembly, we tagged the endogenous chaperones using CRISPR/Cas gene editing and examined the chaperone-bound complexes by cryo-EM. We observe an early α-ring intermediate subcomplex that is stabilized by PAC1-4, which transitions to β-ring assembly upon dissociation of PAC3/PAC4 and rearrangement of the PAC1 N-terminal tail. Completion of the β-ring and dimerization of half-proteasomes repositions critical lysine K33 to trigger cleavage of the β pro-peptides, leading to the concerted dissociation of POMP and PAC1/PAC2 to yield mature 20S proteasomes. This study reveals structural insights into critical points along the assembly pathway of the human proteasome and provides a molecular blueprint for 20S biogenesis.


  • Organizational Affiliation

    Cancer Metabolism and Microenvironment Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, 92037, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-2234Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P25787 (Homo sapiens)
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PHAROS:  P25787
GTEx:  ENSG00000106588 
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-4261Homo sapiensMutation(s): 0 
EC: 3.4.25.1
UniProt & NIH Common Fund Data Resources
Find proteins for P25789 (Homo sapiens)
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PHAROS:  P25789
GTEx:  ENSG00000041357 
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UniProt GroupP25789
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-7248Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for O14818 (Homo sapiens)
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PHAROS:  O14818
GTEx:  ENSG00000101182 
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UniProt GroupO14818
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-5241Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P28066 (Homo sapiens)
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PHAROS:  P28066
GTEx:  ENSG00000143106 
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UniProt GroupP28066
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-1263Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P25786 (Homo sapiens)
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GTEx:  ENSG00000129084 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-3255Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P25788 (Homo sapiens)
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PHAROS:  P25788
GTEx:  ENSG00000100567 
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-6246Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P60900 (Homo sapiens)
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PHAROS:  P60900
GTEx:  ENSG00000100902 
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-7277Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for Q99436 (Homo sapiens)
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GTEx:  ENSG00000136930 
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-3205Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P49720 (Homo sapiens)
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GTEx:  ENSG00000277791 
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-2201Homo sapiensMutation(s): 0 
EC: 3.4.25.1
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Find proteins for P49721 (Homo sapiens)
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GTEx:  ENSG00000126067 
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UniProt GroupP49721
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome assembly chaperone 1K [auth c]288Homo sapiensMutation(s): 0 
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Find proteins for O95456 (Homo sapiens)
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GTEx:  ENSG00000183527 
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UniProt GroupO95456
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome assembly chaperone 2L [auth d]264Homo sapiensMutation(s): 0 
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Find proteins for Q969U7 (Homo sapiens)
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PHAROS:  Q969U7
GTEx:  ENSG00000128789 
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UniProt GroupQ969U7
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome maturation proteinM [auth e]141Homo sapiensMutation(s): 0 
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GTEx:  ENSG00000132963 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM147487
National Institutes of Health/Office of the DirectorUnited StatesOD026926
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesCA030199

Revision History  (Full details and data files)

  • Version 1.0: 2024-10-23
    Type: Initial release