9I3M | pdb_00009i3m

Csu pilus rod antiparallel pair

• PDB DOI: https://doi.org/10.2210/pdb9I3M/pdb
• EM Map EMD-52600: EMDB EMDataResource

• Classification: CELL ADHESION
• Organism(s): Acinetobacter baumannii
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2025-01-23 Released: 2025-12-17 
• Deposition Author(s): Malmi, H., Pakharukova, N., Zavialov, A.V.
• Funding Organization(s): Academy of Finland, Sigrid Juselius Foundation

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 8.91 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental

Literature

Antiparallel stacking of Csu pili drives Acinetobacter baumannii 3D biofilm assembly

Malmi, H., Pakharukova, N., Paul, B., Tuittila, M., Ahmad, I., Knight, S.D., Uhlin, B.E., Ghosal, D., Zavialov, A.V.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 26-mer - A24B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 26-mer - A24B1C1 

Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 2-mer - B2 Local Symmetry: Cyclic - C2  (Explore in 3D)
Local Stoichiometry: Homo 18-mer - A18 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 417.81 kDa 
• Atom Count: 27,096 
• Modeled Residue Count: 3,720 
• Deposited Residue Count: 4,030 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CsuA/B	A [auth A1], B [auth B1], C [auth C1], D [auth D1], E [auth E1], F [auth F1], G [auth G1], H [auth H1], I [auth I1], J [auth J1], K [auth K1], L [auth L1], M [auth M1], N [auth A2], O [auth B2], P [auth C2], Q [auth D2], R [auth E2], S [auth F2], T [auth G2], U [auth H2], V [auth I2], W [auth J2], X [auth K2], Y [auth L2], Z [auth M2]	155	Acinetobacter baumannii	Mutation(s): 0  Gene Names: ATCC19606_12570
UniProt
Find proteins for A0A6F8TDQ5 (Acinetobacter baumannii) Explore A0A6F8TDQ5  Go to UniProtKB:  A0A6F8TDQ5

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 8.91 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC	v4.5.3
MODEL REFINEMENT	PHENIX	1.20.1_4487:

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-12-17 
Deposition Author(s): Malmi, H., Pakharukova, N., Zavialov, A.V.

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Funding Organization	Location	Grant Number
Academy of Finland	Finland	321762
Academy of Finland	Finland	360760
Sigrid Juselius Foundation	Finland	2023

Revision History  

• Version 1.0: 2025-12-17
  Type: Initial release