1EIO

ILEAL LIPID BINDING PROTEIN IN COMPLEX WITH GLYCOCHOLATE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest energies after docking of ligand 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure of ileal lipid binding protein in complex with glycocholate.

Luecke, C.Zhang, F.Hamilton, J.A.Sacchettini, J.C.Rueterjans, H.

(2000) Eur.J.Biochem. 267: 2929-2938


  • PubMed Abstract: 
  • Ileal lipid binding protein (ILBP) is a cytosolic lipid-binding protein that binds both bile acids and fatty acids. We have determined the solution structure of porcine ILBP in complex with glycocholate by homonuclear and heteronuclear two-dimensiona ...

    Ileal lipid binding protein (ILBP) is a cytosolic lipid-binding protein that binds both bile acids and fatty acids. We have determined the solution structure of porcine ILBP in complex with glycocholate by homonuclear and heteronuclear two-dimensional NMR spectroscopy. The conformation of the protein-ligand complex was determined by restrained energy minimization and simulated annealing calculations after docking the glycocholate ligand into the protein structure. The overall tertiary structure of ILBP is highly analogous to the three-dimensional structures of several other intracellular lipid binding proteins (LBPs). Like the apo-structure, the bile-acid complex of ILBP is composed of 10 anti-parallel beta-strands that form a water-filled clam-shell structure, and two short alpha-helices. Chemical shift data indicated that the bile acid ligand is bound inside the protein cavity. Furthermore, 13C-edited heteronuclear single-quantum correlation-NOESY experiments showed NOE contacts between several aromatic residues located in the proposed bile acid portal region and the 13C-labeled ligand. A single bile acid molecule is bound inside the protein, with the steroid moiety penetrating deep into the water-accessible internal cavity, such that ring A is located right above the plane of the Trp49 indole ring. The carboxylate tail of the ligand is protruding from the proposed bile acid portal into the surrounding aqueous solution. The body of the steroid moiety is oriented with the nonpolar face in contact with the mostly hydrophobic residues of beta-strands C, D and E, while the polar face shows contacts with the side-chains of Tyr97, His99, Glu110 and Arg121 in beta-strands H, I and J. Thus, the conformational arrangement of the ligand complex suggests that the binding affinity of ILBP for bile acid molecules is based mainly on strong hydrophobic interactions inside the protein cavity. Furthermore, this binding mode explains how ILBP can transport unconjugated and conjugated bile acids.


    Related Citations: 
    • A comparative study of the backbone dynamics of two closely related lipid binding proteins: bovine heart Fatty Acid Binding Protein and porcine Ileal Lipid Binding Protein
      Luecke, C.,Fushman, D.,Ludwig, C.,Hamilton, J.A.,Sacchettini, J.C.,Rueterjans, H.
      (1999) Mol.Cell.Biochem. 192: 109
    • Flexibility is a likely determinant of binding in the case of Ileal Lipid Binding Protein
      Luecke, C.,Zhang, F.,Rueterjans, H.,Hamilton, J.A.,Sacchettini, J.C.
      (1996) Structure 4: 785


    Organizational Affiliation

    Institut für Biophysikalische Chemie, J. W. Goethe-Universität, Frankfurt a.M., Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ILEAL LIPID BINDING PROTEIN
A
127Sus scrofaGene Names: FABP6 (ILBP, ILLBP)
Find proteins for P10289 (Sus scrofa)
Go to Gene View: FABP6
Go to UniProtKB:  P10289
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GCH
Query on GCH

Download SDF File 
Download CCD File 
A
GLYCOCHOLIC ACID
N-CHOLYLGLYCINE
C26 H43 N O6
RFDAIACWWDREDC-FRVQLJSFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest energies after docking of ligand 
  • Olderado: 1EIO Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-05-31
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance