Crystal Structure of Bacillus thuringiensis Cry6Aa2 Protoxin

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 

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Crystal structure of Cry6Aa: A novel nematicidal ClyA-type alpha-pore-forming toxin from Bacillus thuringiensis

Huang, J.Guan, Z.Wan, L.Zou, T.Sun, M.

(2016) Biochem Biophys Res Commun 478: 307-313

  • DOI: https://doi.org/10.1016/j.bbrc.2016.07.002
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Crystal (Cry) proteins from Bacillus thuringiensis (Bt) are globally used in agriculture as proteinaceous insecticides. Numerous crystal structures have been determined, and most exhibit conserved three-dimensional architectures. Recently, we have identified a novel nematicidal mechanism by which Cry6Aa triggers cell death through a necrosis-signaling pathway via an interaction with the host protease ASP-1. However, we found little sequence conservation of Cry6Aa in our functional study. Here, we report the 1.90 angstrom (Å) resolution structure of the proteolytic form of Cry6Aa (1-396), determined by X-ray crystallography. The structure of Cry6Aa is highly similar to those of the pathogenic toxin family of ClyA-type α-pore-forming toxins (α-PFTs), which are characterized by a bipartite structure comprising a head domain and a tail domain, thus suggesting that Cry6Aa exhibits a previously undescribed nematicidal mode of action. This structure also provides a framework for the functional study of other nematicidal toxins.

  • Organizational Affiliation

    College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pesticidal crystal protein Cry6Aa428Bacillus thuringiensisMutation(s): 0 
Gene Names: cry6AacryVIacryVIA(a)
Find proteins for Q45757 (Bacillus thuringiensis)
Explore Q45757 
Go to UniProtKB:  Q45757
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ45757
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.169 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.637α = 90
b = 101.637β = 90
c = 78.905γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data processing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2016-08-17
    Changes: Database references