6FXB

Bovine beta-lactoglobulin variant A at pH 4.0


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Revealing the Dimeric Crystal and Solution Structure of beta-Lactoglobulin at pH 4 and Its pH and Salt Dependent Monomer-Dimer Equilibrium.

Khan, S.Ipsen, R.Almdal, K.Svensson, B.Harris, P.

(2018) Biomacromolecules 19: 2905-2912

  • DOI: 10.1021/acs.biomac.8b00471

  • PubMed Abstract: 
  • The dimeric structure of bovine β-lactoglobulin A (BLGA) at pH 4.0 was solved to 2.0 Å resolution. Fitting the BLGA pH 4.0 structure to SAXS data at low ionic strength (goodness of fit R-factor = 3.6%) verified the dimeric state in solution. Analysis ...

    The dimeric structure of bovine β-lactoglobulin A (BLGA) at pH 4.0 was solved to 2.0 Å resolution. Fitting the BLGA pH 4.0 structure to SAXS data at low ionic strength (goodness of fit R-factor = 3.6%) verified the dimeric state in solution. Analysis of the monomer-dimer equilibrium at varying pH and ionic strength by SAXS and scattering modeling showed that BLGA is dimeric at pH 3.0 and 4.0, shifting toward a monomer at pH 2.2, 2.6, and 7.0 yielding monomer/dimer ratios of 80/20%, 50/50%, and 25/75%, respectively. BLGA remained a dimer at pH 3.0 and 4.0 in 50-150 mM NaCl, whereas the electrostatic shielding raised the dimer content at pH 2.2, 2.6, and 7.0, i.e., below and above the pI. Overall, the findings provide new insights into the molecular characteristics of BLGA relevant for dairy product formulations and for various biotechnological and pharmaceutical applications.


    Organizational Affiliation

    Enzyme and Protein Chemistry, Department of Biotechnology and Biomedicine , Technical University of Denmark , Søltofts Plads, Building 224 , DK-2800 Kgs. Lyngby , Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Major allergen beta-lactoglobulin
A, B, C, D
162Bos taurusMutation(s): 0 
Gene Names: LGB
Find proteins for P02754 (Bos taurus)
Go to UniProtKB:  P02754
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download SDF File 
Download CCD File 
D
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

Download SDF File 
Download CCD File 
A, B
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.232 
  • Space Group: P 2 21 21
Unit Cell:
Length (Å)Angle (°)
a = 67.110α = 90.00
b = 75.610β = 90.00
c = 140.620γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Danish Research Council for Independent Research | Technical and Production SciencesDenmarkHEXPIN

Revision History 

  • Version 1.0: 2018-05-23
    Type: Initial release
  • Version 1.1: 2018-07-18
    Type: Data collection, Database references
  • Version 1.2: 2019-02-20
    Type: Advisory, Data collection, Derived calculations