8FZ6

The human PI31 complexed with bovine 20S proteasome

  • Classification: HYDROLASE
  • Organism(s): Bos taurus
  • Mutation(s): No 

  • Deposited: 2023-01-27 Released: 2023-07-05 
  • Deposition Author(s): Hsu, H.-C., Li, H.
  • Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.54 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Eta igh-resolution structure of mammalian PI31-20S proteasome complex reveals mechanism of proteasome inhibition.

Hsu, H.C.Wang, J.Kjellgren, A.Li, H.DeMartino, G.N.

(2023) J Biol Chem 299: 104862-104862

  • DOI: https://doi.org/10.1016/j.jbc.2023.104862
  • Primary Citation of Related Structures:  
    8FZ5, 8FZ6

  • PubMed Abstract: 

    Proteasome-catalyzed protein degradation mediates and regulates critical aspects of many cellular functions and is an important element of proteostasis in health and disease. Proteasome function is determined in part by the types of proteasome holoenzymes formed between the 20S core particle that catalyzes peptide bond hydrolysis and any of multiple regulatory proteins to which it binds. One of these regulators, PI31, was previously identified as an in vitro 20S proteasome inhibitor, but neither the molecular mechanism nor the possible physiologic significance of PI31-mediated proteasome inhibition has been clear. Here we report a high-resolution cryo-EM structure of the mammalian 20S proteasome in complex with PI31. The structure shows that two copies of the intrinsically disordered carboxyl terminus of PI31 are present in the central cavity of the closed-gate conformation of the proteasome and interact with proteasome catalytic sites in a manner that blocks proteolysis of substrates but resists their own degradation. The two inhibitory polypeptide chains appear to originate from PI31 monomers that enter the catalytic chamber from opposite ends of the 20S cylinder. We present evidence that PI31 can inhibit proteasome activity in mammalian cells and may serve regulatory functions for the control of cellular proteostasis.


  • Organizational Affiliation

    Department of Structural Biology, Van Andel Institute, Grand Rapids, Michigan, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-6
A, O
246Bos taurusMutation(s): 0 
UniProt
Find proteins for Q2YDE4 (Bos taurus)
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-2
B, P
234Bos taurusMutation(s): 0 
UniProt
Find proteins for Q3T0Y5 (Bos taurus)
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UniProt GroupQ3T0Y5
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-4
C, Q
261Bos taurusMutation(s): 0 
UniProt
Find proteins for Q3ZCK9 (Bos taurus)
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-7
D, R
248Bos taurusMutation(s): 0 
UniProt
Find proteins for Q3ZBG0 (Bos taurus)
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-5
E, S
241Bos taurusMutation(s): 0 
UniProt
Find proteins for Q5E987 (Bos taurus)
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-1
F, T
263Bos taurusMutation(s): 0 
UniProt
Find proteins for Q3T0X5 (Bos taurus)
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit alpha type-3
G, U
255Bos taurusMutation(s): 0 
UniProt
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-6
H, V
239Bos taurusMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-7
I, W
277Bos taurusMutation(s): 0 
EC: 3.4.25.1
UniProt
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-3
J, X
205Bos taurusMutation(s): 0 
UniProt
Find proteins for P33672 (Bos taurus)
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-2
K, Y
201Bos taurusMutation(s): 0 
UniProt
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-5
L, Z
263Bos taurusMutation(s): 0 
EC: 3.4.25.1
UniProt
Find proteins for Q32KL2 (Bos taurus)
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-1AA [auth a],
M
241Bos taurusMutation(s): 0 
UniProt
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome subunit beta type-4BA [auth b],
N
264Bos taurusMutation(s): 0 
UniProt
Find proteins for Q3T108 (Bos taurus)
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Entity ID: 15
MoleculeChains Sequence LengthOrganismDetailsImage
Proteasome inhibitor PI31 subunitCA [auth c],
DA [auth d]
271Bos taurusMutation(s): 0 
UniProt
Find proteins for Q3SX30 (Bos taurus)
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.54 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC3.3.2
MODEL REFINEMENTPHENIX1.20.1-4487

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI070285
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM129088

Revision History  (Full details and data files)

  • Version 1.0: 2023-07-05
    Type: Initial release
  • Version 1.1: 2024-06-19
    Changes: Data collection, Refinement description