8K6P

Crystal structure of SHARPIN LTM motif


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 

Starting Model: experimental
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Literature

Mechanistic insights into the homo-dimerization of HOIL-1L and SHARPIN.

Zhang, Y.Xu, X.Wang, Y.Wang, Y.Zhou, X.Pan, L.

(2023) Biochem Biophys Res Commun 689: 149239-149239

  • DOI: https://doi.org/10.1016/j.bbrc.2023.149239
  • Primary Citation of Related Structures:  
    8K6P, 8K6Q

  • PubMed Abstract: 

    HOIL-1L and SHARPIN are two essential regulatory subunits of the linear ubiquitin chain assembly complex (LUBAC), which is the only known E3 ligase complex generating linear ubiquitin chains. In addition to their LUBAC-dependent functions, HOIL-1L and SHARPIN alone play crucial roles in many LUBAC-independent cellular processes. Importantly, deficiency of HOIL-1L or SHARPIN leads to severe disorders in humans or mice. However, the mechanistic bases underlying the multi-functions of HOIL-1L and SHARPIN are still largely unknown. Here, we uncover that HOIL-1L and SHARPIN alone can form homo-dimers through their LTM motifs. We solve two crystal structures of the dimeric LTM motifs of HOIL-1L and SHARPIN, which not only elucidate the detailed molecular mechanism underpinning the dimer formations of HOIL-1L and SHARPIN, but also reveal a general mode shared by the LTM motifs of HOIL-1L and SHARPIN for forming homo-dimer or hetero-dimer. Furthermore, we elucidate that the polyglucosan body myopathy-associated HOIL-1L A18P mutation disturbs the structural folding of HOIL-1L LTM, and disrupts the dimer formation of HOIL-1L. In summary, our study provides mechanistic insights into the homo-dimerization of HOIL-1L and SHARPIN mediated by their LTM motifs, and expands our understandings of the multi-functions of HOIL-1L and SHARPIN as well as the etiology of relevant human disease caused by defective HOIL-1L.


  • Organizational Affiliation

    Department of Chemistry, College of Science, Shanghai University, Shanghai, 200444, China; State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200032, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sharpin
A, B, C
48Homo sapiensMutation(s): 0 
Gene Names: SHARPINSIPL1PSEC0216
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H0F6 (Homo sapiens)
Explore Q9H0F6 
Go to UniProtKB:  Q9H0F6
PHAROS:  Q9H0F6
GTEx:  ENSG00000179526 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9H0F6
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.38α = 90
b = 39.24β = 97.041
c = 31.35γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China91753113

Revision History  (Full details and data files)

  • Version 1.0: 2024-07-03
    Type: Initial release