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Open data
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Basic information
| Entry | Database: PDB / ID: 9cyn | ||||||
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| Title | Flagellar filament sheath protein FlaA1 | ||||||
Components | Endoflagellar filament sheath protein | ||||||
Keywords | STRUCTURAL PROTEIN / flagellum / bacterial motility / flagellar filament | ||||||
| Function / homology | Flagellar filament outer layer protein FlaA / Flagellar filament outer layer protein Flaa / periplasmic flagellum / bacterial-type flagellum-dependent cell motility / outer membrane-bounded periplasmic space / Endoflagellar filament sheath protein Function and homology information | ||||||
| Biological species | Leptospira borgpetersenii serovar Hardjo-bovis (bacteria) | ||||||
| Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 1.82 Å | ||||||
Authors | San Martin, F. / Larrieux, N. / Trajtenberg, F. / Buschiazzo, A. | ||||||
| Funding support | Uruguay, 1items
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Citation | Journal: Nat Commun / Year: 2026Title: Core-sheath coupling controls flagellar curvature and motility in Leptospira. Authors: Fabiana San Martin / Megan R Brady / Lenka Fule / Lucienne Nouchikian / Azalia Rodriguez / Magalie Duchateau / Sonia Mondino / Nicole Larrieux / Elsio A Wunder / Albert I Ko / Martial Rey / ...Authors: Fabiana San Martin / Megan R Brady / Lenka Fule / Lucienne Nouchikian / Azalia Rodriguez / Magalie Duchateau / Sonia Mondino / Nicole Larrieux / Elsio A Wunder / Albert I Ko / Martial Rey / Julia Chamot-Rooke / Rosario Duran / Felipe Trajtenberg / Mathieu Picardeau / Charles V Sindelar / Alejandro Buschiazzo / ![]() Abstract: Spirochaete pathogens are among the most invasive bacteria known, causing syphilis, Lyme disease, and leptospirosis. Their tissue penetration depends on periplasmic flagellar filaments that, unlike ...Spirochaete pathogens are among the most invasive bacteria known, causing syphilis, Lyme disease, and leptospirosis. Their tissue penetration depends on periplasmic flagellar filaments that, unlike other bacterial flagella, are encased in a spirochaete-specific multi-protein sheath and deform the cell body into motile waves. How these filaments achieve the mechanical properties needed for invasive motility has remained unclear. Here we determine complete atomic structures of the Leptospira endoflagellar filament, revealing an elaborate sheath of 9 to 12 distinct asymmetrically arranged proteins. We show that the flagellin variant forming the filament core determines sheath composition, producing curvatures ranging from ~3.5 µm to ~5.6 µm. The lower-curvature architecture, employed by pathogenic Leptospira interrogans, proves essential for motility in viscous environments and during infection. Thus, Leptospira achieves environment-specific motility through modular core-sheath coupling, linking atomic-scale structural plasticity to large-scale changes in swimming behaviour. Conservation of key sheath components suggests this mechanism may extend across spirochaetes. | ||||||
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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 | 9cyn.cif.gz | 340.8 KB | Display | PDBx/mmCIF format |
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| PDB format | pdb9cyn.ent.gz | 230.2 KB | Display | PDB format |
| PDBx/mmJSON format | 9cyn.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/cy/9cyn ftp://data.pdbj.org/pub/pdb/validation_reports/cy/9cyn | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 10lkC ![]() 10llC ![]() 10lmC C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Assembly
| Deposited unit | ![]()
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| Noncrystallographic symmetry (NCS) | NCS domain:
NCS domain segments: Ens-ID: ens_1
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About Yorodumi




Leptospira borgpetersenii serovar Hardjo-bovis (bacteria)
X-RAY DIFFRACTION
Citation







PDBj

