1GXA

BOVINE BETA-LACTOGLOBULIN COMPLEXED WITH RETINOL AND PALMITIC ACID, TRIGONAL LATTICE Z


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.301 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Ligand-Binding Site of Bovine Beta-Lactoglobulin: Evidence for a Function?

Kontopidis, G.Holt, C.Sawyer, L.

(2002) J.Mol.Biol. 318: 1043

  • DOI: 10.1016/S0022-2836(02)00017-7
  • Primary Citation of Related Structures:  1GX8, 1GX9

  • PubMed Abstract: 
  • Ever since the fortuitous observation that beta-lactoglobulin (beta-Lg), the major whey protein in the milk of ruminants, bound retinol, the details of the binding have been controversial. beta-Lg is a lipocalin, like plasma retinol-binding protein, ...

    Ever since the fortuitous observation that beta-lactoglobulin (beta-Lg), the major whey protein in the milk of ruminants, bound retinol, the details of the binding have been controversial. beta-Lg is a lipocalin, like plasma retinol-binding protein, so that ligand association was expected to make use of the central cavity in the protein. However, an early crystallographic analysis and some of the more recent solution studies indicated binding elsewhere. We have now determined the crystal structures of the complexes of the trigonal form of beta-Lg at pH 7.5 with bound retinol (R=21.4% for 7329 reflections between 20 and 2.4 A resolution, R(free)=30.6%) and with bound retinoic acid (R=22.7% for 7813 reflections between 20 and 2.34 A resolution, R(free)=29.8%). Both ligands are found to occupy the central calyx in a manner similar to retinol binding in retinol-binding protein. We find no evidence of binding at the putative external binding site in either of these structural analyses. Further, competition between palmitic acid and retinol reveals only palmitate bound to the protein. An explanation is provided for the lack of ligand binding to the orthorhombic crystal form also obtained at pH 7.5. Finally, the possible function of beta-Lg is discussed in the light of its species distribution and similarity to other lipocalins.


    Related Citations: 
    • Beta-Lactoglobuli Binds Palmitate within its Central Cavity
      Wu, S.-Y.,Perez, M.D.,Puyol, P.,Sawyer, L.
      (1999) J.Biol.Chem. 274: 170


    Organizational Affiliation

    Structural Biochemistry Group, Institute of Cell and Molecular Biology, The University of Edinburgh, Swann Building, King's Buildings, Mayfield Road, EH9 3JR, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-LACTOGLOBULIN
A
162Bos taurusGene Names: LGB
Find proteins for P02754 (Bos taurus)
Go to UniProtKB:  P02754
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLM
Query on PLM

Download SDF File 
Download CCD File 
A
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.301 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 53.636α = 90.00
b = 53.636β = 90.00
c = 112.027γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHELXL-97refinement
SHELXphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-06-13
    Type: Initial release
  • Version 1.1: 2011-06-02
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance