7BGA

Mutant F105A of recombinant beta-lactoglobulin in complex with endogenous ligand


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Interactions of new lactoglobulin variants with tetracaine: crystallographic studies of ligand binding to lactoglobulin mutants possessing single substitution in the binding pocket.

Loch, J.Bonarek, P.Siuda, M.Wrobel, P.Lewinski, K.

(2021) Acta Biochim Pol 68: 23-28

  • DOI: https://doi.org/10.18388/abp.2020_5593
  • Primary Citation of Related Structures:  
    7BF7, 7BF8, 7BF9, 7BGA, 7BGX, 7BGZ, 7BH0

  • PubMed Abstract: 

    β-Lactoglobulin (BLG) like other lipocalins can be modified by mutagenesis to re-direct its ligand binding properties. Local site-directed mutagenesis was used to change the geometry of the BLG ligand binding pocket and therefore change BLG ligand preferences. The presented studies are focused on previously described mutants L39Y, I56F, L58F, F105L, and M107L and two new BLG variants, L39K and F105A, and their interactions with local anesthetic drug tetracaine. Binding of tetracaine to BLG mutants was investigated by X-ray crystallography. Structural analysis revealed that for tetracaine binding, the shape of the binding pocket seems to be a more important factor than the substitutions influencing the number of interactions. Analyzed BLG mutants can be classified according to their binding properties to variants: capable of binding tetracaine in the β-barrel (L58F, M107L); capable of accommodating tetracaine on the protein surface (I56F) and unable to bind tetracaine (F105L). Variants L39K, L39Y, and F105A, had a binding pocket blocked by endogenous fatty acids. The new tetracaine binding site was found in the I56F variant. The site localized on the surface near Arg124 and Trp19 was previously predicted by in silico studies and was confirmed in the crystal structure.


  • Organizational Affiliation

    Department of Crystal Chemistry and Crystal Physics, Faculty of Chemistry, Jagiellonian University, Kraków, Poland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-lactoglobulinA [auth AAA]162Bos taurusMutation(s): 3 
Gene Names: LGB
UniProt
Find proteins for P02754 (Bos taurus)
Explore P02754 
Go to UniProtKB:  P02754
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02754
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.34α = 90
b = 53.34β = 90
c = 112.31γ = 120
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
CrysalisProdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Polish National Science CentrePoland2012/05/B/ST5/00278

Revision History  (Full details and data files)

  • Version 1.0: 2021-01-20
    Type: Initial release
  • Version 1.1: 2021-03-31
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Database references, Derived calculations, Refinement description