3E3C

Structure of GrlR-lipid complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Identification and characterization of the lipid binding property of GrlR, a locus of enterocyte effacement regulator.

Jobichen, C.Fernandis, A.Z.Velazquez-Campoy, A.Leung, K.Y.Mok, Y.K.Wenk, M.R.Sivaraman, J.

(2009) Biochem J 

  • DOI: 10.1042/BJ20081588
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Lipocalins are a broad family of proteins identified initially in eukaryotes and more recently in Gram-negative bacteria. The functions of lipocalin or lipid-binding proteins are often elusive and very diverse. Recently, we have determined the struct ...

    Lipocalins are a broad family of proteins identified initially in eukaryotes and more recently in Gram-negative bacteria. The functions of lipocalin or lipid-binding proteins are often elusive and very diverse. Recently, we have determined the structure of GrlR (global regulator of LEE repressor), which plays a key role in the regulation of LEE (locus of enterocyte effacement) proteins. GrlR adopts a lipocalin-like fold that is composed of an eight-stranded beta-barrel followed by an alpha-helix at the C-terminus. GrlR has a highly hydrophobic cavity region and could be a potential transporter of lipophilic molecules. To verify this hypothesis, we carried out structure-based analysis of GrlR, determined the structure of the lipid-GrlR complex and measured the binding of lipid to recombinant GrlR by ITC (isothermal titration calorimetry). In addition, we identified phosphatidylglycerol and phosphatidylethanolamine as the endogenously bound lipid species of GrlR using electrospray-ionization MS. Furthermore, we have shown that the lipid-binding property of GrlR is similar to that of its closest lipocalin structural homologue, beta-lactoglobulin. Our studies demonstrate the hitherto unknown lipid-binding property of GrlR.


    Organizational Affiliation

    Department of Biological Sciences, National University of Singapore, Singapore.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
L0044A, B118Escherichia coliMutation(s): 0 
Gene Names: ECs4578
Find proteins for Q7DB61 (Escherichia coli O157:H7)
Explore Q7DB61 
Go to UniProtKB:  Q7DB61
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HHG
Query on HHG

Download CCD File 
A, B
(2R)-2-HYDROXY-3-(PHOSPHONOOXY)PROPYL HEXANOATE
C9 H19 O7 P
FIMVTNBZKNVWDN-QMMMGPOBSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
HHGKd :  2400   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.231 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.729α = 90
b = 66.015β = 90
c = 83.462γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance