Bacillus endospore appendages form a novel family of disulfide-linked pili

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

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This is version 1.2 of the entry. See complete history


Endospore Appendages: a novel pilus superfamily from the endospores of pathogenic Bacilli.

Pradhan, B.Liedtke, J.Sleutel, M.Lindback, T.Zegeye, E.D.O Sullivan, K.Llarena, A.K.Brynildsrud, O.Aspholm, M.Remaut, H.

(2021) EMBO J 40: e106887-e106887

  • DOI: https://doi.org/10.15252/embj.2020106887
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacillus cereus sensu lato is a group of Gram-positive endospore-forming bacteria with high ecological diversity. Their endospores are decorated with micrometer-long appendages of unknown identity and function. Here, we isolate endospore appendages (Enas) from the food poisoning outbreak strain B. cereus NVH 0075-95 and find proteinaceous fibers of two main morphologies: S- and L-Ena. By using cryoEM and 3D helical reconstruction of S-Enas, we show these to represent a novel class of Gram-positive pili. S-Enas consist of single domain subunits with jellyroll topology that are laterally stacked by β-sheet augmentation. S-Enas are longitudinally stabilized by disulfide bonding through N-terminal connector peptides that bridge the helical turns. Together, this results in flexible pili that are highly resistant to heat, drought, and chemical damage. Phylogenomic analysis reveals a ubiquitous presence of the ena-gene cluster in the B. cereus group, which include species of clinical, environmental, and food importance. We propose Enas to represent a new class of pili specifically adapted to the harsh conditions encountered by bacterial spores.

  • Organizational Affiliation

    Structural and Molecular Microbiology, VIB-VUB Center for Structural Biology, VIB, Brussels, Belgium.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DUF3992 domain-containing protein
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W
117Bacillus cereusMutation(s): 0 
Gene Names: B1995_14460B2J90_04405BACERE00183_02460CNQ78_18995
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Research Foundation - Flanders (FWO)BelgiumG0G0818N

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-28
    Type: Initial release
  • Version 1.1: 2021-06-09
    Changes: Database references
  • Version 1.2: 2021-09-15
    Changes: Database references