Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 15.68 kDa 
• Atom Count: 1296 
• Residue Count: 139 
• Unique protein chains: 1

3P6C

Human adipocyte lipid-binding protein FABP4 in complex with citric acid

• DOI: 10.2210/pdb3P6C/pdb

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


• Deposited: 2010-10-11 Released: 2011-04-13 
• Deposition Author(s): Gonzalez, J.M., Pozharski, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.25 Å
• R-Value Free: 0.212 
• R-Value Work: 0.168 
• R-Value Observed: 0.171 

Literature

Structural analysis of ibuprofen binding to human adipocyte fatty-acid binding protein (FABP4).

Gonzalez, J.M., Fisher, S.Z.

(2015) Acta Crystallogr F Struct Biol Commun 71: 163-170

• PubMed: 25664790 
• DOI: 10.1107/S2053230X14027897
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Inhibition of human adipocyte fatty-acid binding protein (FABP4) has been proposed as a treatment for type 2 diabetes, fatty liver disease and atherosclerosis. However, FABP4 displays a naturally low selectivity towards hydrophobic ligands, leading to the possibility of side effects arising from cross-inhibition of other FABP isoforms. In a search for structural determinants of ligand-binding selectivity, the binding of FABP4 towards a group of small molecules structurally related to the nonsteroidal anti-inflammatory drug ibuprofen was analyzed through X-ray crystallography. Several specific hydrophobic interactions are shown to enhance the binding affinities of these compounds, whereas an aromatic edge-to-face interaction is proposed to determine the conformation of bound ligands, highlighting the importance of aromatic interactions in hydrophobic environments.

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Organizational Affiliation: 

Protein Crystallography Station, Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Fatty acid-binding protein, adipocyte	A	139	Homo sapiens	Mutation(s): 0  Gene Names: FABP4
Find proteins for P15090 (Homo sapiens) Explore P15090  Go to UniProtKB:  P15090
NIH Common Fund Data Resources
PHAROS  P15090 GTEx  ENSG00000170323

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CIT	A	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.25 Å
• R-Value Free: 0.212 
• R-Value Work: 0.168 
• R-Value Observed: 0.171 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 32.239	α = 90
b = 53.316	β = 90
c = 75.002	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-10-11 
• Released Date: 2011-04-13 
Deposition Author(s): Gonzalez, J.M., Pozharski, E.

Revision History 

• Version 1.0: 2011-04-13
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2015-02-11
  Changes: Database references
• Version 1.3: 2015-02-25
  Changes: Database references