3KCU

Structure of formate channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.243 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1038/nature08610
  • Primary Citation of Related Structures:  

  • 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 unk ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Probable formate transporter 1
A, B, C, D, E
285Escherichia coli O157:H7Mutation(s): 0 
Gene Names: focA
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels : Formate/Nitrite Transporter (FNT) Family
Protein: 
FocA, pentameric aquaporin-like formate transporter
Find proteins for P0AC25 (Escherichia coli O157:H7)
Go to UniProtKB:  P0AC25
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MA5
Query on MA5

Download SDF File 
Download CCD File 
A
2-(6-(2-CYCLOHEXYLETHOXY)-TETRAHYDRO-4,5-DIHYDROXY-2(HYDROXYMETHYL)-2H-PYRAN-3-YLOXY)-TETRAHYDRO-6(HYDROXYMETHYL)-2H-PYRAN-3,4,5-TRIOL
CYCLOHEXYLETHYL-BETA-D-MALTOSIDE
C20 H36 O11
RHXPDNGQJSXOMW-OIIXUNCGSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.243 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 101.378α = 90.00
b = 107.934β = 90.00
c = 163.128γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
SCALEPACKdata scaling
BSSdata collection
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-01-22
    Type: Database references