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Open data
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Basic information
| Entry | Database: PDB / ID: 9sii | |||||||||||||||||||||
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| Title | Supercoiling bacterial archaellum filament from L. aerophila | |||||||||||||||||||||
Components | Flagellin | |||||||||||||||||||||
Keywords | PROTEIN FIBRIL / Helical / cell surface structure / motility / archaellum / Supercoiling / Superhelicity | |||||||||||||||||||||
| Function / homology | Flagellin, archaea / Archaeal-type flagellin / Flagellin/pilin, N-terminal / archaeal or bacterial-type flagellum-dependent cell motility / structural molecule activity / membrane / Flagellin Function and homology information | |||||||||||||||||||||
| Biological species | Litorilinea aerophila (bacteria) | |||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | |||||||||||||||||||||
Authors | Sivabalasarma, S. / Taib, N. / Mollat, C.L. / Joest, M. / Steimle, S. / Gribaldo, S. / Albers, S.-V. | |||||||||||||||||||||
| Funding support | Germany, 1items
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Citation | Journal: Nat Microbiol / Year: 2025Title: Structure of a functional archaellum in Bacteria of the Chloroflexota phylum. Authors: Shamphavi Sivabalasarma / Najwa Taib / Clara L Mollat / Marie Joest / Stefan Steimle / Simonetta Gribaldo / Sonja-Verena Albers / ![]() Abstract: Motility in Archaea is driven by the archaellum, a rotary ATP-driven machinery unrelated to the bacterial flagellum. To date, archaella have been described exclusively in archaea; however, recent ...Motility in Archaea is driven by the archaellum, a rotary ATP-driven machinery unrelated to the bacterial flagellum. To date, archaella have been described exclusively in archaea; however, recent work reported archaellum genes in bacterial strains of the SAR202 clade (Chloroflexota). Here, using MacSyFinder, we show that bona fide archaellum gene clusters are widespread in several members of the Chloroflexota. Analysis of archaellum-encoding loci and Alphafold3-predicted structures show similarity to the archaellum machinery. Using cryo electron microscopy single-particle analysis, we solved the structure of the bacterial archaellum from Litorilinea aerophila to 2.7 Å. We also show the expression and assembly of this machinery in bacteria and its function in swimming motility. Finally, a phylogenomic analysis revealed two horizontal gene transfer events from euryarchaeal members to Chloroflexota. In summary, our study shows that a functional and assembled archaellum machinery can be exchanged between the two prokaryotic domains. #1: Journal: To Be PublishedTitle: Horizontal gene transfer of the functional archaellum machinery to Bacteria Authors: Sivabalasarma, S. / Taib, N. / Mollat, C.L. / Joest, M. / Steimle, S. / Gribaldo, S. / Albers, S.-V. | |||||||||||||||||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 9sii.cif.gz | 1.5 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb9sii.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 9sii.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/si/9sii ftp://data.pdbj.org/pub/pdb/validation_reports/si/9sii | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 54928MC ![]() 9sieC C: citing same article ( M: map data used to model this data |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
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Assembly
| Deposited unit | ![]()
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| Noncrystallographic symmetry (NCS) | NCS domain:
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About Yorodumi




Litorilinea aerophila (bacteria)
Germany, 1items
Citation



PDBj