38LP | pdb_000038lp

Salmonella Flagellar Export Apparatus (FliPQR/FlhB/FlhA) in the context of the intact basal body with an asymmetric FlhA ring

• PDB DOI: https://doi.org/10.2210/pdb38LP/pdb
• EM Map EMD-78907: EMDB EMDataResource

• Classification: PROTEIN TRANSPORT
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
• Mutation(s): No 


• Deposited: 2026-09-01 Released: 2026-10-07 
• Deposition Author(s): Johnson, S., Johnson, M.K., Lea, S.M.
• Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 4.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structure of the proton-powered secretion motor at the heart of the bacterial flagellum

Johnson, M.K., Johnson, S., Deme, J.C., Alfaro-Alvarado, L., Bryant, O.J., Chevance, F.F.V., Hughes, K.T., Lea, S.M.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 20-mer - A9B5C4D1E1 

Local Symmetry: Cyclic - C9  (Explore in 3D)
Local Stoichiometry: Homo 9-mer - A9 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 5-mer - B5 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 4-mer - C4 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 918 kDa 
• Atom Count: 35,427 
• Modeled Residue Count: 4,699 
• Deposited Residue Count: 8,456 
• Unique protein chains: 5

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar biosynthetic protein FliP	A [auth A1], B [auth B1], C [auth C1], D [auth D1], E [auth E1]	245	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P54700 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P54700  Go to UniProtKB:  P54700

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar biosynthetic protein FliR	F [auth F1]	264	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P54702 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P54702  Go to UniProtKB:  P54702

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar biosynthetic protein FliQ	G [auth G1], H [auth H1], I [auth I1], J [auth J1]	89	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P0A1L5 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P0A1L5  Go to UniProtKB:  P0A1L5

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar biosynthetic protein FlhB	K [auth K1]	383	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P40727 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P40727  Go to UniProtKB:  P40727

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar biosynthesis protein FlhA	L [auth A2], M [auth B2], N [auth C2], O [auth D2], P [auth E2], Q [auth F2], R [auth G2], S [auth H2], T [auth I2]	692	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P40729 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P40729  Go to UniProtKB:  P40729

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 4.20 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	2.0_5936
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-10-07 
Deposition Author(s): Johnson, S., Johnson, M.K., Lea, S.M.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)	United States	Intramural Research Program

Revision History  

• Version 1.0: 2026-10-07
  Type: Initial release