8QN4 | pdb_00008qn4

Structure of the BAM-EspP complex in an open EspP intermediate state

• PDB DOI: https://doi.org/10.2210/pdb8QN4/pdb
• EM Map EMD-18507: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): Yes 
• Membrane Protein: Yes  PDBTMMemProtMD


• Deposited: 2023-09-25 Released: 2024-10-02 
• Deposition Author(s): Xie, T., Pang, J., Shen, C., Chang, S., Tang, X., Zhang, X., Dong, H., Zhou, R.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.36 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Dynamic topology-mediated maturation of beta-barrel proteins in BAM-catalyzed folding

Xie, T., Chan, K.C., Pang, J., Shen, C., Chang, S., Buratto, D., Tang, X., Zhang, X., Dong, H., Zhou, R.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - A1B1C1D1E1F1 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 249.6 kDa 
• Atom Count: 12,443 
• Modeled Residue Count: 1,591 
• Deposited Residue Count: 2,267 
• Unique protein chains: 6

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Outer membrane protein assembly factor BamA	A	810	Escherichia coli K-12	Mutation(s): 1  Gene Names: bamA, yaeT, yzzN, yzzY, b0177, JW0172 Membrane Entity: Yes
UniProt
Find proteins for P0A940 (Escherichia coli (strain K12)) Explore P0A940  Go to UniProtKB:  P0A940

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Outer membrane protein assembly factor BamB	B	392	Escherichia coli K-12	Mutation(s): 0  Gene Names: bamB, yfgL, b2512, JW2496 Membrane Entity: Yes
UniProt
Find proteins for P77774 (Escherichia coli (strain K12)) Explore P77774  Go to UniProtKB:  P77774

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Outer membrane protein assembly factor BamC	C	344	Escherichia coli K-12	Mutation(s): 0  Gene Names: bamC, dapX, nlpB, b2477, JW2462 Membrane Entity: Yes
UniProt
Find proteins for P0A903 (Escherichia coli (strain K12)) Explore P0A903  Go to UniProtKB:  P0A903

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Outer membrane protein assembly factor BamD	D	245	Escherichia coli K-12	Mutation(s): 0  Gene Names: bamD, yfiO, b2595, JW2577 Membrane Entity: Yes
UniProt
Find proteins for P0AC02 (Escherichia coli (strain K12)) Explore P0AC02  Go to UniProtKB:  P0AC02

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Outer membrane protein assembly factor BamE	E	123	Escherichia coli K-12	Mutation(s): 0  Gene Names: bamE, smpA, b2617, JW2598 Membrane Entity: Yes
UniProt
Find proteins for P0A937 (Escherichia coli (strain K12)) Explore P0A937  Go to UniProtKB:  P0A937

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
EspP epsilon	F	353	Escherichia coli K-12	Mutation(s): 1  Gene Names: espP EC: 3.4.21 Membrane Entity: Yes
UniProt
Find proteins for O32591 (Escherichia coli) Explore O32591  Go to UniProtKB:  O32591

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.36 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-10-02 
Deposition Author(s): Xie, T., Pang, J., Shen, C., Chang, S., Tang, X., Zhang, X., Dong, H., Zhou, R.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History  

• Version 1.0: 2024-10-02
  Type: Initial release
  
• Version 1.1: 2024-10-23
  Changes: Data collection, Structure summary
• Version 2.0: 2025-10-01
  Type: Coordinate replacement
  Reason: Model completeness
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary