4TLJ

Ultra-high resolution crystal structure of caprine Beta-lactoglobulin

• PDB DOI: https://doi.org/10.2210/pdb4TLJ/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Capra hircus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2014-05-30 Released: 2014-06-18 
• Deposition Author(s): Crowther, J.M., Jameson, G.B., Suzuki, H., Dobson, R.C.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.17 Å
• R-Value Free: 0.159 
• R-Value Work: 0.132 
• R-Value Observed: 0.132 

Starting Model: experimental

Literature

Ultra-high resolution crystal structure of recombinant caprine beta-lactoglobulin.

Crowther, J.M., Lasse, M., Suzuki, H., Kessans, S.A., Loo, T.S., Norris, G.E., Hodgkinson, A.J., Jameson, G.B., Dobson, R.C.

(2014) FEBS Lett 588: 3816-3822

• PubMed: 25241165 
• DOI: https://doi.org/10.1016/j.febslet.2014.09.010
• Primary Citation of Related Structures:  
  4TLJ


• PubMed Abstract: 
  

  β-Lactoglobulin (βlg) is the most abundant whey protein in the milks of ruminant animals. While bovine βlg has been subjected to a vast array of studies, little is known about the caprine ortholog. We present an ultra-high resolution crystal structure of caprine βlg complemented by analytical ultracentrifugation and small-angle X-ray scattering data. In both solution and crystalline states caprine βlg is dimeric (K(D)<5 μM); however, our data suggest a flexible quaternary arrangement of subunits within the dimer. These structural findings will provide insight into relationships among structural, processing, nutritional and immunological characteristics that distinguish cow's and goat's milk.

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Organizational Affiliation: 

Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 36.51 kDa 
• Atom Count: 3,223 
• Modelled Residue Count: 324 
• Deposited Residue Count: 324 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-lactoglobulin	A, B	162	Capra hircus	Mutation(s): 0  Gene Names: LGB
UniProt
Find proteins for P02756 (Capra hircus) Explore P02756  Go to UniProtKB:  P02756

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BU1	C [auth A]	1,4-BUTANEDIOL C4 H10 O2 WERYXYBDKMZEQL-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.17 Å
• R-Value Free: 0.159 
• R-Value Work: 0.132 
• R-Value Observed: 0.132 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.32	α = 90
b = 54.58	β = 107.31
c = 56.39	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
Coot	model building

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-06-18 
Deposition Author(s): Crowther, J.M., Jameson, G.B., Suzuki, H., Dobson, R.C.J.

Revision History  

• Version 1.0: 2014-06-18
  Type: Initial release
  
• Version 1.1: 2014-10-15
  Changes: Database references
• Version 1.2: 2014-12-24
  Changes: Database references
• Version 1.3: 2015-02-04
  Changes: Derived calculations
• Version 2.0: 2017-11-22
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy
• Version 2.1: 2023-09-27
  Changes: Data collection, Database references, Refinement description