2ANS

ADIPOCYTE LIPID BINDING PROTEIN COMPLEXED WITH 1-ANILINO-8-NAPHTHALENE SULFONATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Studies of the ligand binding reaction of adipocyte lipid binding protein using the fluorescent probe 1, 8-anilinonaphthalene-8-sulfonate.

Ory, J.J.Banaszak, L.J.

(1999) Biophys.J. 77: 1107-1116

  • DOI: 10.1016/S0006-3495(99)76961-4

  • PubMed Abstract: 
  • The fluorescent probe anilinonaphthalene-8-sulfonate binds to adipocyte lipid binding protein at a site that competes with normal physiological ligands, such as fatty acids. Binding to the protein is accompanied by a relatively large increase in fluo ...

    The fluorescent probe anilinonaphthalene-8-sulfonate binds to adipocyte lipid binding protein at a site that competes with normal physiological ligands, such as fatty acids. Binding to the protein is accompanied by a relatively large increase in fluorescent intensity. To correlate the major change in optical properties and to determine the mechanism of competitive inhibition with fatty acids, the crystal structure of the protein with the bound fluorophore has been determined. In addition, the thermodynamic contributions to the binding reaction have been studied by titration calorimetry. Because the binding site is in a relatively internal position, kinetic studies have also been carried out to determine k(on). The results indicate that binding is not accompanied by any major conformational change. However, the negatively charged sulfonate moiety is not positioned the same as the carboxylate of fatty acid ligands as determined in previous studies. Nonetheless, the binding reaction is still driven by enthalpic effects. As judged by the crystallographic structure, a significant amount of the surface of the fluorophore is no longer exposed to water in the bound state.


    Organizational Affiliation

    Department of Biochemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ADIPOCYTE LIPID-BINDING PROTEIN
A, B
131Mus musculusMutation(s): 0 
Gene Names: Fabp4 (Ap2)
Find proteins for P04117 (Mus musculus)
Go to UniProtKB:  P04117
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
2AN
Query on 2AN

Download SDF File 
Download CCD File 
A, B
8-ANILINO-1-NAPHTHALENE SULFONATE
C16 H13 N O3 S
FWEOQOXTVHGIFQ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
2ANKi: 1000 nM (91) BINDINGDB
2ANKd: 150 nM (91) BINDINGDB
2ANKd: 1200 nM BINDINGMOAD
2ANKd: 1200 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 80.800α = 90.00
b = 96.100β = 90.00
c = 49.900γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
CNSrefinement
XENGENdata scaling
X-PLORrefinement
CNSphasing
XENGENdata reduction
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-07-22
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.3: 2019-07-17
    Type: Data collection, Refinement description, Structure summary
  • Version 1.4: 2019-08-14
    Type: Data collection