4UF9

Electron cryo-microscopy structure of PB1-p62 type T filaments


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.3 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Selective Autophagy Receptor P62 Forms a Flexible Filamentous Helical Scaffold.

Ciuffa, R.Lamark, T.Tarafder, A.K.Guesdon, A.Rybina, S.Hagen, W.J.H.Johansen, T.Sachse, C.

(2015) Cell Rep. 11: 748

  • DOI: 10.1016/j.celrep.2015.03.062
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The scaffold protein p62/SQSTM1 is involved in protein turnover and signaling and is commonly found in dense protein bodies in eukaryotic cells. In autophagy, p62 acts as a selective autophagy receptor that recognizes and shuttles ubiquitinated prote ...

    The scaffold protein p62/SQSTM1 is involved in protein turnover and signaling and is commonly found in dense protein bodies in eukaryotic cells. In autophagy, p62 acts as a selective autophagy receptor that recognizes and shuttles ubiquitinated proteins to the autophagosome for degradation. The structural organization of p62 in cellular bodies and the interplay of these assemblies with ubiquitin and the autophagic marker LC3 remain to be elucidated. Here, we present a cryo-EM structural analysis of p62. Together with structures of assemblies from the PB1 domain, we show that p62 is organized in flexible polymers with the PB1 domain constituting a helical scaffold. Filamentous p62 is capable of binding LC3 and addition of long ubiquitin chains induces disassembly and shortening of filaments. These studies explain how p62 assemblies provide a large molecular scaffold for the nascent autophagosome and reveal how they can bind ubiquitinated cargo.


    Organizational Affiliation

    European Molecular Biology Laboratory, Structural and Computation Biology Unit, Meyerhofstrasse 1, 69117 Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SEQUESTOSOME-1
A, B, D
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: 10.3 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-05-13
    Type: Initial release
  • Version 1.1: 2015-05-27
    Type: Database references
  • Version 1.2: 2017-08-30
    Type: Data collection