Cryo-EM structure of p62-PB1 filament (L-type)

Experimental Data Snapshot

  • Resolution: 3.50 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

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Structural basis of p62/SQSTM1 helical filaments and their role in cellular cargo uptake.

Jakobi, A.J.Huber, S.T.Mortensen, S.A.Schultz, S.W.Palara, A.Kuhm, T.Shrestha, B.K.Lamark, T.Hagen, W.J.H.Wilmanns, M.Johansen, T.Brech, A.Sachse, C.

(2020) Nat Commun 11: 440-440

  • DOI: https://doi.org/10.1038/s41467-020-14343-8
  • Primary Citation of Related Structures:  
    6TGN, 6TGP, 6TGS, 6TGY, 6TH3

  • PubMed Abstract: 

    p62/SQSTM1 is an autophagy receptor and signaling adaptor with an N-terminal PB1 domain that forms the scaffold of phase-separated p62 bodies in the cell. The molecular determinants that govern PB1 domain filament formation in vitro remain to be determined and the role of p62 filaments inside the cell is currently unclear. We here determine four high-resolution cryo-EM structures of different human and Arabidopsis PB1 domain assemblies and observed a filamentous ultrastructure of p62/SQSTM1 bodies using correlative cellular EM. We show that oligomerization or polymerization, driven by a double arginine finger in the PB1 domain, is a general requirement for lysosomal targeting of p62. Furthermore, the filamentous assembly state of p62 is required for autophagosomal processing of the p62-specific cargo KEAP1. Our results show that using such mechanisms, p62 filaments can be critical for cargo uptake in autophagy and are an integral part of phase-separated p62 bodies.

  • Organizational Affiliation

    European Molecular Biology Laboratory (EMBL), Structural and Computational Biology Unit, Meyerhofstraße 1, 69117, Heidelberg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sequestosome-1122Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q13501 (Homo sapiens)
Explore Q13501 
Go to UniProtKB:  Q13501
PHAROS:  Q13501
GTEx:  ENSG00000161011 
Entity Groups  
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UniProt GroupQ13501
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.50 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European CommissionPIEF-GA-2012-331285
European CommissionPCOFUND-GA-2008-229597
German Research FoundationGermanyEXC1074

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-12
    Type: Initial release