1O1V

Human Ileal Lipid-Binding Protein (ILBP) in Complex with Cholyltaurine


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: lowest intermolecular restraint violation, DIANA target function 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Insights into the bile acid transportation system: the human ileal lipid-binding protein-cholyltaurine complex and its comparison with homologous structures.

Kurz, M.Brachvogel, V.Matter, H.Stengelin, S.Thuering, H.Kramer, W.

(2003) Proteins 50: 312-328

  • DOI: 10.1002/prot.10289
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bile acids are generated in vivo from cholesterol in the liver, and they undergo an enterohepatic circulation involving the small intestine, liver, and kidney. To understand the molecular mechanism of this transportation, it is essential to gain insi ...

    Bile acids are generated in vivo from cholesterol in the liver, and they undergo an enterohepatic circulation involving the small intestine, liver, and kidney. To understand the molecular mechanism of this transportation, it is essential to gain insight into the three-dimensional (3D) structures of proteins involved in the bile acid recycling in free and complexed form and to compare them with homologous members of this protein family. Here we report the solution structure of the human ileal lipid-binding protein (ILBP) in free form and in complex with cholyltaurine. Both structures are compared with a previously published structure of the porcine ILBP-cholylglycine complex and with related lipid-binding proteins. Protein structures were determined in solution by using two-dimensional (2D)- and 3D-homo and heteronuclear NMR techniques, leading to an almost complete resonance assignment and a significant number of distance constraints for distance geometry and restrained molecular dynamics simulations. The identification of several intermolecular distance constraints unambiguously determines the cholyltaurine-binding site. The bile acid is deeply buried within ILBP with its flexible side-chain situated close to the fatty acid portal as entry region into the inner ILBP core. This binding mode differs significantly from the orientation of cholylglycine in porcine ILBP. A detailed analysis using the GRID/CPCA strategy reveals differences in favorable interactions between protein-binding sites and potential ligands. This characterization will allow for the rational design of potential inhibitors for this relevant system.


    Organizational Affiliation

    Aventis Pharma Deutschland GmbH, DI&A Chemistry, DG Metabolic Diseases, Frankfurt am Main, Germany. michael.kurz@aventis.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Gastrotropin
A
127Homo sapiensMutation(s): 0 
Gene Names: FABP6 (ILBP, ILLBP)
Find proteins for P51161 (Homo sapiens)
Go to Gene View: FABP6
Go to UniProtKB:  P51161
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TCH
Query on TCH

Download SDF File 
Download CCD File 
A
TAUROCHOLIC ACID
C26 H45 N O7 S
WBWWGRHZICKQGZ-HZAMXZRMSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: lowest intermolecular restraint violation, DIANA target function 
  • Olderado: 1O1V Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-18
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance