1ZZV | pdb_00001zzv

Solution NMR Structure of the Periplasmic Signaling Domain of the Outer Membrane Iron Transporter FecA from Escherichia coli.

• PDB DOI: https://doi.org/10.2210/pdb1ZZV/pdb

• Classification: MEMBRANE PROTEIN, METAL TRANSPORT
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2005-06-14 Released: 2006-09-26 
• Deposition Author(s): Ferguson, A.D., Amezcua, C.A., Chelliah, Y., Rosen, M.K., Deisenhofer, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Signal transduction pathway of TonB-dependent transporters.

Ferguson, A.D., Amezcua, C.A., Halabi, N.M., Chelliah, Y., Rosen, M.K., Ranganathan, R., Deisenhofer, J.

(2006) Proc Natl Acad Sci U S A 2: 513-518

• PubMed: 17197416 
• DOI: https://doi.org/10.1073/pnas.0609887104
• Primary Citation Related Structures: 
  1ZZV, 2A02


• PubMed Abstract: 
  

  Transcription of the ferric citrate import system is regulated by ferric citrate binding to the outer membrane transporter FecA. A signal indicating transporter occupancy is relayed across the outer membrane to energy-transducing and regulatory proteins embedded in the cytoplasmic membrane. Because transcriptional activation is not coupled to ferric citrate import, an allosteric mechanism underlies this complex signaling mechanism. Using evolution-based statistical analysis we have identified a sparse but structurally connected network of residues that links distant functional sites in FecA. Functional analyses of these positions confirm their involvement in the mechanism that regulates transcriptional activation in response to ferric citrate binding at the cell surface. This mechanism appears to be conserved and provides the structural basis for the allosteric signaling of TonB-dependent transporters.

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Organizational Affiliation: 
• Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 8.37 kDa 
• Atom Count: 590 
• Modeled Residue Count: 80 
• Deposited Residue Count: 80 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Iron(III) dicitrate transport protein fecA	A	80	Escherichia coli	Mutation(s): 0  Gene Names: fecA
UniProt
Find proteins for P13036 (Escherichia coli (strain K12)) Explore P13036  Go to UniProtKB:  P13036

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 1000 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-09-26 
Deposition Author(s): Ferguson, A.D., Amezcua, C.A., Chelliah, Y., Rosen, M.K., Deisenhofer, J.

Revision History  

• Version 1.0: 2006-09-26
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-09
  Changes: Database references, Derived calculations
• Version 1.4: 2024-05-22
  Changes: Data collection