3DWO

Crystal structure of a Pseudomonas aeruginosa FadL homologue


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Transmembrane passage of hydrophobic compounds through a protein channel wall.

Hearn, E.M.Patel, D.R.Lepore, B.W.Indic, M.van den Berg, B.

(2009) Nature 458: 367-370

  • DOI: https://doi.org/10.1038/nature07678
  • Primary Citation of Related Structures:  
    2R4L, 2R4N, 2R4O, 2R4P, 2R88, 3DWN, 3DWO

  • PubMed Abstract: 

    Membrane proteins that transport hydrophobic compounds have important roles in multi-drug resistance and can cause a number of diseases, underscoring the importance of protein-mediated transport of hydrophobic compounds. Hydrophobic compounds readily partition into regular membrane lipid bilayers, and their transport through an aqueous protein channel is energetically unfavourable. Alternative transport models involving acquisition from the lipid bilayer by lateral diffusion have been proposed for hydrophobic substrates. So far, all transport proteins for which a lateral diffusion mechanism has been proposed function as efflux pumps. Here we present the first example of a lateral diffusion mechanism for the uptake of hydrophobic substrates by the Escherichia coli outer membrane long-chain fatty acid transporter FadL. A FadL mutant in which a lateral opening in the barrel wall is constricted, but which is otherwise structurally identical to wild-type FadL, does not transport substrates. A crystal structure of FadL from Pseudomonas aeruginosa shows that the opening in the wall of the beta-barrel is conserved and delineates a long, hydrophobic tunnel that could mediate substrate passage from the extracellular environment, through the polar lipopolysaccharide layer and, by means of the lateral opening in the barrel wall, into the lipid bilayer from where the substrate can diffuse into the periplasm. Because FadL homologues are found in pathogenic and biodegrading bacteria, our results have implications for combating bacterial infections and bioremediating xenobiotics in the environment.


  • Organizational Affiliation

    Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Probable outer membrane proteinA [auth X]451Pseudomonas aeruginosaMutation(s): 0 
Gene Names: PA4589
Membrane Entity: Yes 
UniProt
Find proteins for Q9HVJ6 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HVJ6 
Go to UniProtKB:  Q9HVJ6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HVJ6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
C8E
Query on C8E

Download Ideal Coordinates CCD File 
C [auth X]
D [auth X]
E [auth X]
F [auth X]
G [auth X]
C [auth X],
D [auth X],
E [auth X],
F [auth X],
G [auth X],
H [auth X],
I [auth X],
J [auth X],
K [auth X],
L [auth X],
M [auth X]
(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
B [auth X]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.777α = 90
b = 233.054β = 90
c = 81.899γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations