3WDZ

Crystal Structure of Keap1 in Complex with phosphorylated p62


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Phosphorylation of p62 activates the Keap1-Nrf2 pathway during selective autophagy.

Ichimura, Y.Waguri, S.Sou, Y.S.Kageyama, S.Hasegawa, J.Ishimura, R.Saito, T.Yang, Y.Kouno, T.Fukutomi, T.Hoshii, T.Hirao, A.Takagi, K.Mizushima, T.Motohashi, H.Lee, M.S.Yoshimori, T.Tanaka, K.Yamamoto, M.Komatsu, M.

(2013) Mol.Cell 51: 618-631

  • DOI: 10.1016/j.molcel.2013.08.003

  • PubMed Abstract: 
  • The Keap1-Nrf2 system and autophagy are both involved in the oxidative-stress response, metabolic pathways, and innate immunity, and dysregulation of these processes is associated with pathogenic processes. However, the interplay between these two pa ...

    The Keap1-Nrf2 system and autophagy are both involved in the oxidative-stress response, metabolic pathways, and innate immunity, and dysregulation of these processes is associated with pathogenic processes. However, the interplay between these two pathways remains largely unknown. Here, we show that phosphorylation of the autophagy-adaptor protein p62 markedly increases p62's binding affinity for Keap1, an adaptor of the Cul3-ubiquitin E3 ligaseĀ complex responsible for degrading Nrf2. Thus, p62 phosphorylation induces expression of cytoprotective Nrf2 targets. p62 is assembled on selective autophagic cargos such as ubiquitinated organelles and subsequently phosphorylated in an mTORC1-dependent manner, implying coupling of the Keap1-Nrf2 system to autophagy. Furthermore, persistent activation of Nrf2 through accumulation of phosphorylated p62 contributes to the growth of human hepatocellular carcinomas (HCCs). These results demonstrate that selective autophagy and the Keap1-Nrf2 pathway are interdependent, and that inhibitors of the interaction between phosphorylated p62 and Keap1 have potential as therapeutic agents against human HCC.


    Organizational Affiliation

    Protein Metabolism Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kelch-like ECH-associated protein 1
A
311Mus musculusMutation(s): 0 
Gene Names: Keap1 (Inrf2, Kiaa0132)
Find proteins for Q9Z2X8 (Mus musculus)
Go to UniProtKB:  Q9Z2X8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide from Sequestosome-1
B
14Mus musculusMutation(s): 0 
Gene Names: Sqstm1 (A170, STAP)
Find proteins for Q64337 (Mus musculus)
Go to UniProtKB:  Q64337
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
B
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.191 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 75.149α = 90.00
b = 75.149β = 90.00
c = 113.008γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
REFMACrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-12-25
    Type: Database references, Source and taxonomy