6AAF

Crystal structure of fission yeast Atg8 complexed with the helical AIM of Hfl1.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.216 

Starting Model: experimental
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Literature

Lipidation-independent vacuolar functions of Atg8 rely on its noncanonical interaction with a vacuole membrane protein

Liu, X.M.Yamasaki, A.Du, X.M.Coffman, V.C.Ohsumi, Y.Nakatogawa, H.Wu, J.Q.Noda, N.N.Du, L.L.

(2018) Elife 7

  • DOI: https://doi.org/10.7554/eLife.41237
  • Primary Citation of Related Structures:  
    6AAF, 6AAG

  • PubMed Abstract: 

    The ubiquitin-like protein Atg8, in its lipidated form, plays central roles in autophagy. Yet, remarkably, Atg8 also carries out lipidation-independent functions in non-autophagic processes. How Atg8 performs its moonlighting roles is unclear. Here we report that in the fission yeast Schizosaccharomyces pombe and the budding yeast Saccharomyces cerevisiae , the lipidation-independent roles of Atg8 in maintaining normal morphology and functions of the vacuole require its interaction with a vacuole membrane protein Hfl1 (homolog of human TMEM184 proteins). Crystal structures revealed that the Atg8-Hfl1 interaction is not mediated by the typical Atg8-family-interacting motif (AIM) that forms an intermolecular β-sheet with Atg8. Instead, the Atg8-binding regions in Hfl1 proteins adopt a helical conformation, thus representing a new type of AIMs (termed helical AIMs here). These results deepen our understanding of both the functional versatility of Atg8 and the mechanistic diversity of Atg8 binding.


  • Organizational Affiliation

    National Institute of Biological Sciences, Beijing, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Autophagy-related protein 8119Schizosaccharomyces pombe 972h-Mutation(s): 0 
Gene Names: atg8SPBP8B7.24c
UniProt
Find proteins for O94272 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore O94272 
Go to UniProtKB:  O94272
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO94272
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Transmembrane protein 184 homolog C30D11.06c31Schizosaccharomyces pombe 972h-Mutation(s): 0 
Gene Names: SPAC30D11.06c
UniProt
Find proteins for Q09906 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore Q09906 
Go to UniProtKB:  Q09906
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ09906
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.798α = 90
b = 108.866β = 90
c = 35.12γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of ScienceJapan25111004

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-12
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description