5W9A

The structure of the Trim5alpha Bbox- coiled coil in complex LC3B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.260 
  • R-Value Observed: 0.260 

Starting Models: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A helical LC3-interacting region mediates the interaction between the retroviral restriction factor Trim5 alpha and mammalian autophagy-related ATG8 proteins.

Keown, J.R.Black, M.M.Ferron, A.Yap, M.Barnett, M.J.Pearce, F.G.Stoye, J.P.Goldstone, D.C.

(2018) J Biol Chem 293: 18378-18386

  • DOI: https://doi.org/10.1074/jbc.RA118.004202
  • Primary Citation of Related Structures:  
    5W9A

  • PubMed Abstract: 

    The retroviral restriction factor tripartite motif-containing 5α (Trim5α) acts during the early postentry stages of the retroviral life cycle to block infection by a broad range of retroviruses, disrupting reverse transcription and integration. The mechanism of this restriction is poorly understood, but it has recently been suggested to involve recruitment of components of the autophagy machinery, including members of the mammalian autophagy-related 8 (ATG8) family involved in targeting proteins to the autophagosome. To better understand the molecular details of this interaction, here we utilized analytical ultracentrifugation to characterize the binding of six ATG8 isoforms and determined the crystal structure of the Trim5α Bbox coiled-coil region in complex with one member of the mammalian ATG8 proteins, autophagy-related protein LC3 B (LC3B). We found that Trim5α binds all mammalian ATG8s and that, unlike the typical LC3-interacting region (LIR) that binds to mammalian ATG8s through a β-strand motif comprising approximately six residues, LC3B binds to Trim5α via the α-helical coiled-coil region. The orientation of the structure demonstrated that LC3B could be accommodated within a Trim5α assembly that can bind the retroviral capsid. However, mutation of the binding interface does not affect retroviral restriction. Comparison of the typical linear β-strand LIR with our atypical helical LIR reveals a conservation of the presentation of residues that are required for the interaction with LC3B. This observation expands the range of LC3B-binding proteins to include helical binding motifs and demonstrates a link between Trim5α and components of the autophagosome.


  • Organizational Affiliation

    From the School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tripartite motif-containing protein 5A,
D [auth B]
193Macaca mulattaMutation(s): 2 
Gene Names: TRIM5
EC: 2.3.2.27
UniProt
Find proteins for Q0PF16 (Macaca mulatta)
Explore Q0PF16 
Go to UniProtKB:  Q0PF16
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ0PF16
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Microtubule-associated proteins 1A/1B light chain 3BB [auth C],
C [auth D]
114Homo sapiensMutation(s): 0 
Gene Names: MAP1LC3BMAP1ALC3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9GZQ8 (Homo sapiens)
Explore Q9GZQ8 
Go to UniProtKB:  Q9GZQ8
PHAROS:  Q9GZQ8
GTEx:  ENSG00000140941 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9GZQ8
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.260 
  • R-Value Observed: 0.260 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.014α = 90
b = 115.319β = 90
c = 174.164γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2018-10-17
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2018-12-12
    Changes: Data collection, Database references
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description