5WQ4

Crystal structure of OPTN and linear diubiquitin complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into the ubiquitin recognition by OPTN (optineurin) and its regulation by TBK1-mediated phosphorylation.

Li, F.Xu, D.Wang, Y.Zhou, Z.Liu, J.Hu, S.Gong, Y.Yuan, J.Pan, L.

(2018) Autophagy 14: 66-79

  • DOI: 10.1080/15548627.2017.1391970
  • Primary Citation of Related Structures:  
    5WQ4

  • PubMed Abstract: 
  • OPTN (optineurin), a ubiquitin-binding scaffold protein, functions as an important macroautophagy/autophagy receptor in selective autophagy processes. Mutations in OPTN have been linked with human neurodegenerative diseases including ALS and glaucoma ...

    OPTN (optineurin), a ubiquitin-binding scaffold protein, functions as an important macroautophagy/autophagy receptor in selective autophagy processes. Mutations in OPTN have been linked with human neurodegenerative diseases including ALS and glaucoma. However, the mechanistic basis underlying the recognition of ubiquitin by OPTN and its regulation by TBK1-mediated phosphorylation are still elusive. Here, we demonstrate that the UBAN domain of OPTN preferentially recognizes linear ubiquitin chain and forms an asymmetric 2:1 stoichiometry complex with the linear diubiquitin. In addition, our results provide new mechanistic insights into how phosphorylation of UBAN would regulate the ubiquitin-binding ability of OPTN and how disease-associated mutations in the OPTN UBAN domain disrupt its interaction with ubiquitin. Finally, we show that defects in ubiquitin-binding may affect the recruitment of OPTN to linear ubiquitin-decorated mutant Huntington protein aggregates. Taken together, our findings clarify the interaction mode between UBAN and linear ubiquitin chain in general, and expand our knowledge of the molecular mechanism of ubiquitin-decorated substrates recognition by OPTN as well as the pathogenesis of neurodegenerative diseases caused by OPTN mutations.


    Organizational Affiliation

    c Collaborative Innovation Center of Chemistry for Life Sciences , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , Shanghai , China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
OptineurinCDEF97Mus musculusMutation(s): 0 
Gene Names: Optn
Find proteins for Q8K3K8 (Mus musculus)
Explore Q8K3K8 
Go to UniProtKB:  Q8K3K8
NIH Common Fund Data Resources
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ubiquitinAB152Homo sapiensMutation(s): 0 
Gene Names: UBC
Find proteins for P0CG48 (Homo sapiens)
Explore P0CG48 
Go to UniProtKB:  P0CG48
NIH Common Fund Data Resources
PHAROS  P0CG48
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.248 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.659α = 90
b = 77.659β = 90
c = 166.552γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-11-23 
  • Released Date: 2017-12-06 
  • Deposition Author(s): Li, F., Pan, L.

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31470749, 21621002

Revision History 

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2018-12-19
    Changes: Data collection, Database references