2GRX

Crystal structure of TonB in complex with FhuA, E. coli outer membrane receptor for ferrichrome

• PDB DOI: https://doi.org/10.2210/pdb2GRX/pdb

• Classification: METAL TRANSPORT
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2006-04-25 Released: 2006-06-13 
• Deposition Author(s): Pawelek, P.D., Allaire, M., Coulton, J.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.30 Å
• R-Value Free: 0.329 
• R-Value Work: 0.284 
• R-Value Observed: 0.299 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 216.87 kDa 
• Atom Count: 12,533 
• Modelled Residue Count: 1,549 
• Deposited Residue Count: 1,908 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ferrichrome-iron receptor	A, B	725	Escherichia coli	Mutation(s): 0  Gene Names: fhuA Membrane Entity: Yes
UniProt
Find proteins for P06971 (Escherichia coli (strain K12)) Explore P06971  Go to UniProtKB:  P06971

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein tonB	C, D	229	Escherichia coli	Mutation(s): 0  Gene Names: tonB Membrane Entity: Yes
UniProt
Find proteins for P02929 (Escherichia coli (strain K12)) Explore P02929  Go to UniProtKB:  P02929

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
3-deoxy-alpha-D-manno-oct-2-ulopyranosonic acid-(2-4)-[L-glycero-alpha-D-manno-heptopyranose-(1-5)]3-deoxy-alpha-D-manno-oct-2-ulopyranosonic acid-(2-6)-2-amino-2,3-dideoxy-alpha-D-glucoyranose-(1-6)-2-amino-2,3-dideoxy-alpha-D-glucoyranose	E, F	5		N/A
Glycosylation Resources
GlyTouCan:  G17606RK GlyCosmos:  G17606RK

Small Molecules

Ligands 7 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FCI	O [auth A], Y [auth B]	FERRICROCIN-IRON C28 H44 Fe N9 O13 FNBCUYMSQPYITB-AFXYHRJJSA-N
FTT	H [auth A], I [auth A], J [auth A], K [auth A], Q [auth B], R [auth B], S [auth B], T [auth B]	3-HYDROXY-TETRADECANOIC ACID C14 H28 O3 ATRNZOYKSNPPBF-CYBMUJFWSA-N
MYR	W [auth B]	MYRISTIC ACID C14 H28 O2 TUNFSRHWOTWDNC-UHFFFAOYSA-N
DAO	M [auth A], V [auth B]	LAURIC ACID C12 H24 O2 POULHZVOKOAJMA-UHFFFAOYSA-N
DPO	L [auth A], U [auth B]	DIPHOSPHATE O7 P2 XPPKVPWEQAFLFU-UHFFFAOYSA-J
EAP	N [auth A], X [auth B]	2-AMINO-VINYL-PHOSPHATE C2 H6 N O4 P KYMLMTPYCDIFEC-OWOJBTEDSA-N
PO4	G [auth A], P [auth B]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.30 Å
• R-Value Free: 0.329 
• R-Value Work: 0.284 
• R-Value Observed: 0.299 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 234.32	α = 90
b = 91.84	β = 118.86
c = 138.51	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-06-13 
Deposition Author(s): Pawelek, P.D., Allaire, M., Coulton, J.W.

Revision History  

• Version 1.0: 2006-06-13
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary
• Version 2.1: 2023-08-30
  Changes: Data collection, Database references, Refinement description, Structure summary