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- EMDB-11591: Bacillus endospore appendages form a novel family of disulfide-li... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-11591 | |||||||||
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Title | Bacillus endospore appendages form a novel family of disulfide-linked pili | |||||||||
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Function / homology | Endospore appendages core / Endospore appendages / DUF3992 domain-containing protein![]() | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.0 Å | |||||||||
![]() | Pradhan B / Liedtke J / Sleutel M / Lindback T / Llarena AK / Brynildsrud O / Aspholm M / Remaut H | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Endospore Appendages: a novel pilus superfamily from the endospores of pathogenic Bacilli. Authors: Brajabandhu Pradhan / Janine Liedtke / Mike Sleutel / Toril Lindbäck / Ephrem Debebe Zegeye / Kristin O Sullivan / Ann-Katrin Llarena / Ola Brynildsrud / Marina Aspholm / Han Remaut / ![]() ![]() 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 ...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. #1: ![]() Title: Bacillus endospore appendages form a novel family of disulfide-linked pili Authors: Pradhan B / Liedtke J / Sleutel M / Lindback T / Llarena AK / Brynildsrud O / Aspholm M / Remaut H | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 13.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 13.6 KB 13.6 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 7.6 KB | Display | ![]() |
Images | ![]() | 60.3 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7a02MC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Voxel size | X=Y=Z: 0.784 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Ena1B
Entire | Name: Ena1B |
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Components |
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-Supramolecule #1: Ena1B
Supramolecule | Name: Ena1B / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: all Details: In vitro assembled Bacillus endospore appendage comprising the subunit Ena1B |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
-Macromolecule #1: DUF3992 domain-containing protein
Macromolecule | Name: DUF3992 domain-containing protein / type: protein_or_peptide / ID: 1 / Number of copies: 23 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 12.162675 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MGNCSTNLSC CANGQKTIVQ DKVCIDWTAA ATAAIIYADN ISQDIYASGY LKVDTGTGPV TIVFYSGGVT GTAVETIVVA TGSSASFTV RRFDTVTILG TAAAETGEFC MTIRYTLS |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | helical array |
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Sample preparation
Buffer | pH: 7 / Component - Formula: H2O |
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Support film - Material: GRAPHENE OXIDE / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: OTHER |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 298.15 K / Instrument: GATAN CRYOPLUNGE 3 |
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Electron microscopy
Microscope | JEOL CRYO ARM 300 |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 3000 / Average electron dose: 64.66 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated defocus max: 3.5 µm / Calibrated defocus min: 0.5 µm / Calibrated magnification: 60000 / Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Sample stage | Specimen holder model: JEOL 3200FSC CRYOHOLDER |
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Image processing
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: AB INITIO MODEL / Overall B value: 27.4 |
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Output model | ![]() PDB-7a02: |