9DC4 | pdb_00009dc4

Transferrin Binding Protein A in complex with transferrin binding protein B, transferrin and globular domain of TonB

• PDB DOI: https://doi.org/10.2210/pdb9DC4/pdb
• EM Map EMD-46743: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Neisseria meningitidis serogroup B, Homo sapiens, Neisseria meningitidis
• Expression System: Escherichia coli, Homo sapiens
• Mutation(s): No 


• Deposited: 2024-08-25 Released: 2026-03-04 
• Deposition Author(s): Dubey, S., Noinaj, N.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Transferrin Binding Protein A in complex with transferrin binding protein B, transferrin and globular domain of TonB

Dubey, S., Noinaj, N.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 267 kDa 
• Atom Count: 17,026 
• Modeled Residue Count: 2,186 
• Deposited Residue Count: 2,413 
• Unique protein chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transferrin-binding protein A	A	915	Neisseria meningitidis serogroup B	Mutation(s): 0  Gene Names: tbpA
UniProt
Find proteins for Q9JPJ0 (Neisseria meningitidis) Explore Q9JPJ0  Go to UniProtKB:  Q9JPJ0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Transferrin-binding protein B	B	692	Neisseria meningitidis serogroup B	Mutation(s): 0  Gene Names: tbpB
UniProt
Find proteins for Q9JPI9 (Neisseria meningitidis) Explore Q9JPI9  Go to UniProtKB:  Q9JPI9

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Serotransferrin	C [auth F]	698	Homo sapiens	Mutation(s): 0  Gene Names: TF, PRO1400
UniProt & NIH Common Fund Data Resources
Find proteins for P02787 (Homo sapiens) Explore P02787  Go to UniProtKB:  P02787
PHAROS:  P02787 GTEx:  ENSG00000091513

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein TonB	D [auth T]	108	Neisseria meningitidis	Mutation(s): 0  Gene Names: tonB
UniProt
Find proteins for P95374 (Neisseria meningitidis serogroup C) Explore P95374  Go to UniProtKB:  P95374

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BCT (Subject of Investigation/LOI)	E [auth F]	BICARBONATE ION C H O3 BVKZGUZCCUSVTD-UHFFFAOYSA-M
FE (Subject of Investigation/LOI)	F	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-03-04 
Deposition Author(s): Dubey, S., Noinaj, N.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	1R01GM127884

Revision History  

• Version 1.0: 2026-03-04
  Type: Initial release