1IFB

REFINED APOPROTEIN STRUCTURE OF RAT INTESTINAL FATTY ACID BINDING PROTEIN PRODUCED IN ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Refined apoprotein structure of rat intestinal fatty acid binding protein produced in Escherichia coli.

Sacchettini, J.C.Gordon, J.I.Banaszak, L.J.

(1989) Proc.Natl.Acad.Sci.USA 86: 7736-7740


  • PubMed Abstract: 
  • Rat intestinal fatty acid binding protein (I-FABP) is a member of a family of cytoplasmic hydrophobic ligand-binding proteins. To gain insights about the contribution of bound fatty acid to I-FABP's conformation and mechanism of ligand binding, we ha ...

    Rat intestinal fatty acid binding protein (I-FABP) is a member of a family of cytoplasmic hydrophobic ligand-binding proteins. To gain insights about the contribution of bound fatty acid to I-FABP's conformation and mechanism of ligand binding, we have determined the structure of Escherichia coli-derived rat apo-I-FABP to 1.96-A resolution and compared it to the recently refined structure of I-FABP with bound palmitate. Both apo- and holo-I-FABP are composed primarily of anti-parallel beta-strands which form two nearly orthogonal beta-sheets ("beta-clam"). The overall structures of the apo- and holo-I-FABP are nearly identical, with a root mean square (rms) difference of 0.37 A between C alpha atoms, 0.38 A between all main-chain atoms, and 0.94 A between all side-chain atoms. However, rms differences of greater than 1.3 A were noted for the side chains of Ile-23, Lys-27, Arg-56, Leu-72, Ala-73, and Asp-74. The space occupied by bound ligand in the core of the holoprotein is occupied in the apo-protein by ordered solvent molecules. This results in an increase in the total number of internal ordered solvent molecules from 7 in the holoprotein to 13 in apo-I-FABP. This finding, together with observed differences in the side-chain orientations of two residues (Arg-56 and Lys-27) situated over a potential opening to the cores of the apo- and holoproteins, suggests that solvent molecules play a critical role in ligand binding. Moreover, the data indicate that the beta-clam structure is stable even in the absence of bound ligand.


    Organizational Affiliation

    Department of Biochemistry, Washington University School of Medicine, Saint Louis, MO 63110.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INTESTINAL FATTY ACID BINDING PROTEIN
A
131Rattus norvegicusGene Names: Fabp2 (Fabpi)
Find proteins for P02693 (Rattus norvegicus)
Go to UniProtKB:  P02693
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Work: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 36.000α = 90.00
b = 56.600β = 113.10
c = 31.600γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1992-01-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance