3KCU

Structure of formate channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

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This is version 1.3 of the entry. See complete history


Literature

Structure of the formate transporter FocA reveals a pentameric aquaporin-like channel

Wang, Y.Huang, Y.Wang, J.Cheng, C.Huang, W.Lu, P.Xu, Y.-N.Wang, P.Yan, N.Shi, Y.

(2009) Nature 462: 467-472

  • DOI: https://doi.org/10.1038/nature08610
  • Primary Citation of Related Structures:  
    3KCU, 3KCV

  • PubMed Abstract: 

    FocA is a representative member of the formate-nitrite transporter family, which transports short-chain acids in bacteria, archaea, fungi, algae and parasites. The structure and transport mechanism of the formate-nitrite transporter family remain unknown. Here we report the crystal structure of Escherichia coli FocA at 2.25 A resolution. FocA forms a symmetric pentamer, with each protomer consisting of six transmembrane segments. Despite a lack of sequence homology, the overall structure of the FocA protomer closely resembles that of aquaporin and strongly argues that FocA is a channel, rather than a transporter. Structural analysis identifies potentially important channel residues, defines the channel path and reveals two constriction sites. Unlike aquaporin, FocA is impermeable to water but allows the passage of formate. A structural and biochemical investigation provides mechanistic insights into the channel activity of FocA.


  • Organizational Affiliation

    Ministry of Education Protein Science Laboratory, Center for Structural Biology, School of Life Sciences and School of Medicine, Tsinghua University, Beijing 100084, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Probable formate transporter 1
A, B, C, D, E
285Escherichia coli O157:H7Mutation(s): 0 
Gene Names: FOCA
Membrane Entity: Yes 
UniProt
Find proteins for P0AC25 (Escherichia coli O157:H7)
Explore P0AC25 
Go to UniProtKB:  P0AC25
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AC25
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MA5
Query on MA5

Download Ideal Coordinates CCD File 
F [auth A]2-(6-(2-CYCLOHEXYLETHOXY)-TETRAHYDRO-4,5-DIHYDROXY-2(HYDROXYMETHYL)-2H-PYRAN-3-YLOXY)-TETRAHYDRO-6(HYDROXYMETHYL)-2H-PY RAN-3,4,5-TRIOL
C20 H36 O11
RHXPDNGQJSXOMW-OIIXUNCGSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.378α = 90
b = 107.934β = 90
c = 163.128γ = 90
Software Package:
Software NamePurpose
BSSdata collection
PHASERphasing
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-01-22
    Changes: Database references
  • Version 1.3: 2024-03-20
    Changes: Data collection, Database references, Derived calculations, Structure summary