1TOW

Crystal structure of human adipocyte fatty acid binding protein in complex with a carboxylic acid ligand

• PDB DOI:  https://doi.org/10.2210/pdb1TOW/pdb

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


• Deposited: 2004-06-15 Released: 2004-08-24 
• Deposition Author(s): Lehmann, F., Haile, S., Axen, E., Medina, C., Uppenberg, J., Svensson, S., Lundback, T., Rondahl, L., Barf, T.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.257 
• R-Value Work: 0.188 
• R-Value Observed: 0.192 

Literature

Discovery of inhibitors of human adipocyte fatty acid-binding protein, a potential type 2 diabetes target.

Lehmann, F., Haile, S., Axen, E., Medina, C., Uppenberg, J., Svensson, S., Lundback, T., Rondahl, L., Barf, T.

(2004) Bioorg Med Chem Lett 14: 4445-4448

• PubMed: 15357969 
• DOI: https://doi.org/10.1016/j.bmcl.2004.06.057
• Primary Citation of Related Structures:  
  1TOW


• PubMed Abstract: 
  

  Low micromolar human A-FABP inhibitors were found by utilizing a fluorescence polarization assay, X-ray crystallography and modeling. The carbazole- and indole-based inhibitors displayed approximately 10-fold preferences over human H-FABP and E-FABP, and are highly selective against I-FABP. This communication describes the SAR for drug-like synthetic inhibitors of human A-FABP.

---

Organizational Affiliation: 

Department of Medicinal Chemistry, Biovitrum AB, SE-751 37 Uppsala, Sweden.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.86 kDa 
• Atom Count: 1,215 
• Modelled Residue Count: 131 
• Deposited Residue Count: 131 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fatty acid-binding protein, adipocyte	A	131	Homo sapiens	Mutation(s): 0  Gene Names: FABP4
UniProt & NIH Common Fund Data Resources
Find proteins for P15090 (Homo sapiens) Explore P15090  Go to UniProtKB:  P15090
PHAROS:  P15090

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CRZ	B [auth A]	4-(9H-CARBAZOL-9-YL)BUTANOIC ACID C16 H15 N O2 HQAKVYGASUTQHH-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
CRZ	Binding MOAD:  1TOW	IC50: 570 (nM) from 1 assay(s)
	PDBBind:  1TOW	IC50: 570 (nM) from 1 assay(s)
	BindingDB:  1TOW	IC50: 570 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.257 
• R-Value Work: 0.188 
• R-Value Observed: 0.192 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 72.05	α = 90
b = 53.045	β = 90
c = 31.782	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-08-24 
Deposition Author(s): Lehmann, F., Haile, S., Axen, E., Medina, C., Uppenberg, J., Svensson, S., Lundback, T., Rondahl, L., Barf, T.

Revision History  

• Version 1.0: 2004-08-24
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance