3IFB

NMR STUDY OF HUMAN INTESTINAL FATTY ACID BINDING PROTEIN


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST VIOLATION OF EXPERIMENTAL DISTANCE CONSTRAINTS 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Solution structure of human intestinal fatty acid binding protein: implications for ligand entry and exit.

Zhang, F.Lucke, C.Baier, L.J.Sacchettini, J.C.Hamilton, J.A.

(1997) J Biomol NMR 9: 213-228

  • DOI: 10.1023/a:1018666522787
  • Primary Citation of Related Structures:  
    3IFB

  • PubMed Abstract: 
  • The human intestinal fatty acid binding protein (I-FABP) is a small (131 amino acids) protein which binds dietary long-chain fatty acids in the cytosol of enterocytes. Recently, an alanine to threonine substitution at position 54 in I-FABP has been identified which affects fatty acid binding and transport, and is associated with the development of insulin resistance in several populations including Mexican-Americans and Pima Indians ...

    The human intestinal fatty acid binding protein (I-FABP) is a small (131 amino acids) protein which binds dietary long-chain fatty acids in the cytosol of enterocytes. Recently, an alanine to threonine substitution at position 54 in I-FABP has been identified which affects fatty acid binding and transport, and is associated with the development of insulin resistance in several populations including Mexican-Americans and Pima Indians. To investigate the molecular basis of the binding properties of I-FABP, the 3D solution structure of the more common form of human I-FABP (Ala54) was studied by multidimensional NMR spectroscopy. Recombinant I-FABP was expressed from E. coli in the presence and absence of 15N-enriched media. The sequential assignments for non-delipidated I-FABP were completed by using 2D homonuclear spectra (COSY, TOCSY and NOESY) and 3D heteronuclear spectra (NOESY-HMQC and TOCSY-HMQC). The tertiary structure of human I-FABP was calculated by using the distance geometry program DIANA based on 2519 distance constraints obtained from the NMR data. Subsequent energy minimization was carried out by using the program SYBYL in the presence of distance constraints. The conformation of human I-FABP consists of 10 antiparallel beta-strands which form two nearly orthogonal beta-sheets of five strands each, and two short alpha-helices that connect the beta-strands A and B. The interior of the protein consists of a water-filled cavity between the two beta-sheets. The NMR solution structure of human I-FABP is similar to the crystal structure of rat I-FABP. The NMR results show significant conformational variability of certain backbone segments around the postulated portal region for the entry and exit of fatty acid ligand.


    Related Citations: 
    • A Polymorphism in the Human Intestinal Fatty Acid Binding Protein Alters Fatty Acid Transport Across Caco-2 Cells
      Baier, L.J., Bogardus, C., Sacchettini, J.C.
      (1996) J Biol Chem 271: 10892
    • An Amino Acid Substitution in the Human Intestinal Fatty Acid Binding Protein is Associated with Increased Fatty Acid Binding, Increased Fat Oxidation, and Insulin Resistance
      Baier, L.J., Sacchettini, J.C., Knowler, W.C., Eads, J., Paolisso, G., Tataranni, P.A., Mochizuki, H., Bennet, P.H., Bogardus, C., Prochazka, M.
      (1995) J Clin Invest 95: 1281
    • Refinement of the Structure of Recombinant Rat Intestinal Fatty Acid-Binding Apoprotein at 1.2-Angstroms Resolution
      Scapin, G., Gordon, J.I., Sacchettini, J.C.
      (1992) J Biol Chem 267: 4253

    Organizational Affiliation

    Department of Biophysics, Boston University School of Medicine, Boston, MA 02118, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INTESTINAL FATTY ACID BINDING PROTEINA131Homo sapiensMutation(s): 0 
Gene Names: FABP2FABPI
UniProt & NIH Common Fund Data Resources
Find proteins for P12104 (Homo sapiens)
Explore P12104 
Go to UniProtKB:  P12104
PHAROS:  P12104
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: LOWEST VIOLATION OF EXPERIMENTAL DISTANCE CONSTRAINTS 
  • OLDERADO: 3IFB Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-10-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations