9N8M | pdb_00009n8m

In situ sheathed flagellar FlaC filament in Vibrio cholerae.

• PDB DOI: https://doi.org/10.2210/pdb9N8M/pdb
• EM Map EMD-49131: EMDB EMDataResource

• Classification: MOTOR PROTEIN
• Organism(s): Vibrio cholerae O1 biovar El Tor str. N16961
• Mutation(s): No 


• Deposited: 2025-02-08 Released: 2025-09-24 
• Deposition Author(s): Wangbiao, G., Rajeev, K.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.16 Å
• Aggregation State: CELL 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structures of the sheathed flagellum reveal mechanisms of assembly and rotation in Vibrio cholerae.

Guo, W., Zhang, S., Park, J.H., Stanton, V., Asp, M., Herrera, H., Tai, J.B., Yue, J., Wang, J., Guo, J., Kumar, R., Botting, J.M., Wu, S., Yan, J., Klose, K.E., Yildiz, F.H., Liu, J.

(2025) Nat Microbiol 10: 3305-3314

• PubMed: 41174224 
• DOI: https://doi.org/10.1038/s41564-025-02161-x
• Primary Citation Related Structures: 
  9N8A, 9N8B, 9N8G, 9N8H, 9N8M, 9P7R


• PubMed Abstract: 
  

  Motility promotes the complex life cycle and infectious capabilities of Vibrio cholerae and is driven by rotation of a single polar flagellum. The flagellar filament comprises four flagellin proteins (FlaA-D) and is covered by a membranous sheath continuous with the outer membrane. Here we combine in situ cryo-electron microscopy single-particle analysis, fluorescence microscopy and molecular genetics to determine 2.92-3.43 Å structures of the sheathed flagellar filament from intact bacteria. Our data reveal the spatial arrangement of FlaA-D, showing that FlaA localizes at the cell pole and functions as a template for filament assembly involving multiple flagellins. Unlike unsheathed flagellar filaments, the sheathed filament from V. cholerae possesses a highly conserved core but a smooth, hydrophilic surface adjacent to the membranous sheath. A tiny conformational change at the single flagellin level results in a supercoiled filament and curved membranous sheath, supporting a model wherein the filament rotates separately from the sheath, enabling the distinct motility of V. cholerae.

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Organizational Affiliation: 
• Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, CT, USA. [e-mail].
Microbial Sciences Institute, Yale University, West Haven, CT, USA. [e-mail].
Beverly Hills High School, Beverly Hills, CA, USA.
Department of Microbiology and Environmental Toxicology, University of California, Santa Cruz, CA, USA.
South Texas Center for Emerging Infectious Diseases, Department of Molecular Microbiology and Immunology, University of Texas San Antonio, San Antonio, TX, USA.
Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA.
Quantitative Biology Institute, Yale University, New Haven, CT, USA.
Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, CT, USA.
Microbial Sciences Institute, Yale University, West Haven, CT, USA.
Department of Pharmacology, Yale University, New Haven, CT, USA.
Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, CT, USA. [e-mail].
Microbial Sciences Institute, Yale University, West Haven, CT, USA. [e-mail].

Biological Assembly 1  

Global Symmetry: Helical - H  (Explore in 3D)
Global Stoichiometry: Homo 33-mer - A33 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 1,318.16 kDa 
• Atom Count: 92,202 
• Modeled Residue Count: 12,441 
• Deposited Residue Count: 12,441 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellin C	A [auth M1], AA [auth MR], B [auth M2], BA [auth MS], C [auth M3], CA [auth MT], D [auth M4], DA [auth MU], E [auth M5], EA [auth MV], F [auth M6], FA [auth MW], G [auth M7], GA [auth MX], H [auth M8], I [auth M9], J [auth MA], K [auth MB], L [auth MC], M [auth MD], N [auth ME], O [auth MF], P [auth MG], Q [auth MH], R [auth MI], S [auth MJ], T [auth MK], U [auth ML], V [auth MM], W [auth MN], X [auth MO], Y [auth MP], Z [auth MQ]	377	Vibrio cholerae O1 biovar El Tor str. N16961	Mutation(s): 0
UniProt
Find proteins for P0C6C5 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)) Explore P0C6C5  Go to UniProtKB:  P0C6C5

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.16 Å
• Aggregation State: CELL 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21.2_5419
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-09-24 
Deposition Author(s): Wangbiao, G., Rajeev, K.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R01AI087946
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R01AI132818

Revision History  

• Version 1.0: 2025-09-24
  Type: Initial release
  
• Version 1.1: 2025-11-12
  Changes: Data collection, Database references
• Version 1.2: 2025-12-10
  Changes: Data collection, Database references