Macromolecule Content

• Total Structure Weight: 14.26 kDa 
• Atom Count: 1000 
• Residue Count: 127 
• Unique protein chains: 1

1O1U

human ileal lipid-binding protein (ILBP) in free form

• DOI: 10.2210/pdb1O1U/pdb

• Classification: LIPID BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-02-10 Released: 2003-02-25 
• Deposition Author(s): Kurz, M., Brachvogel, V., Matter, H., Stengelin, S., Thuering, H., Kramer, W.

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Experimental Data Snapshot

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

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

• PubMed: 12486725 
• DOI: 10.1002/prot.10289
• Primary Citation of Related Structures:  
  1O1V, 1O1U


• 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 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.

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Organizational Affiliation: 

Aventis Pharma Deutschland GmbH, DI&A Chemistry, DG Metabolic Diseases, Frankfurt am Main, Germany. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Gastrotropin	A	127	Homo sapiens	Mutation(s): 0  Gene Names: FABP6 OR ILLBP OR ILBP, FABP6, ILBP, ILLBP
Find proteins for P51161 (Homo sapiens) Explore P51161  Go to UniProtKB:  P51161
NIH Common Fund Data Resources
PHAROS:  P51161 GTEx:  ENSG00000170231

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: lowest DIANA target function 
• OLDERADO: 1O1U Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-02-10 
• Released Date: 2003-02-25 
Deposition Author(s): Kurz, M., Brachvogel, V., Matter, H., Stengelin, S., Thuering, H., Kramer, W.

Revision History 

• Version 1.0: 2003-02-25
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance