E. coli FadL Asp348Ala mutant

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

Starting Model: experimental
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Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


From the Cover: Ligand-gated diffusion across the bacterial outer membrane.

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

(2011) Proc Natl Acad Sci U S A 108: 10121-10126

  • DOI: https://doi.org/10.1073/pnas.1018532108
  • Primary Citation of Related Structures:  
    2R89, 2R8A, 3PF1, 3PGR, 3PGS, 3PGU

  • PubMed Abstract: 

    Ligand-gated channels, in which a substrate transport pathway is formed as a result of the binding of a small-molecule chemical messenger, constitute a diverse class of membrane proteins with important functions in prokaryotic and eukaryotic organisms. Despite their widespread nature, no ligand-gated channels have yet been found within the outer membrane (OM) of Gram-negative bacteria. Here we show, using in vivo transport assays, intrinsic tryptophan fluorescence and X-ray crystallography, that high-affinity (submicromolar) substrate binding to the OM long-chain fatty acid transporter FadL from Escherichia coli causes conformational changes in the N terminus that open up a channel for substrate diffusion. The OM long-chain fatty acid transporter FadL from E. coli is a unique paradigm for OM diffusion-driven transport, in which ligand gating within a β-barrel membrane protein is a prerequisite for channel formation.

  • Organizational Affiliation

    University of Massachusetts Medical School, Program in Molecular Medicine, 373 Plantation Street, Worcester, MA 01605, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Long-chain fatty acid transport protein
A, B
424Escherichia coli K-12Mutation(s): 1 
Gene Names: b2344fadLJW2341ttr
Membrane Entity: Yes 
Find proteins for P10384 (Escherichia coli (strain K12))
Explore P10384 
Go to UniProtKB:  P10384
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10384
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on C8E

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
I [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
I [auth B],
K [auth B],
L [auth B],
M [auth B]
C16 H34 O5
Query on LDA

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
J [auth B]
C14 H31 N O
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.88α = 90
b = 145.97β = 90
c = 151.24γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
PHENIXmodel building
HKL-2000data 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: 2011-05-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description