6TH3

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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: 10.1038/s41467-020-14343-8
  • Primary Citation of Related Structures:  

  • 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 dete ...

    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

    JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich, 52425, Jülich, Germany.,European Molecular Biology Laboratory (EMBL), Structural and Computational Biology Unit, Meyerhofstraße 1, 69117, Heidelberg, Germany. c.sachse@fz-juelich.de.,European Molecular Biology Laboratory (EMBL), Hamburg Unit c/o DESY, Notkestraße 85, 22607, Hamburg, Germany.,JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich, 52425, Jülich, Germany. c.sachse@fz-juelich.de.,The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761, Hamburg, Germany.,European Molecular Biology Laboratory (EMBL), Structural and Computational Biology Unit, Meyerhofstraße 1, 69117, Heidelberg, Germany.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, N-0379, Oslo, Norway.,Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons (ER-C-3/Structural Biology), Forschungszentrum Jülich, 52425, Jülich, Germany. c.sachse@fz-juelich.de.,Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway.,Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons (ER-C-3/Structural Biology), Forschungszentrum Jülich, 52425, Jülich, Germany.,Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Van der Maasweg 9, 2629, HZ Delft, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sequestosome-1
A, B, C
122Homo sapiensMutation(s): 0 
Gene Names: SQSTM1 (ORCA, OSIL)
Find proteins for Q13501 (Homo sapiens)
Go to Gene View: SQSTM1
Go to UniProtKB:  Q13501
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


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

Revision History 

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