7NQB | pdb_00007nqb

X.ray structure of the oxaliplatin/beta-lactoglobulin adduct

• PDB DOI: https://doi.org/10.2210/pdb7NQB/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Bos taurus
• Mutation(s): No 


• Deposited: 2021-03-01 Released: 2022-03-23 
• Deposition Author(s): Merlino, A., Loreto, D., Ferraro, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.01 Å
• R-Value Free: 
  0.284 (Depositor), 0.284 (DCC) 
• R-Value Work: 
  0.212 (Depositor), 0.218 (DCC) 

Starting Model: experimental

Literature

Protein-Based Delivery Systems for Anticancer Metallodrugs: Structure and Biological Activity of the Oxaliplatin/ beta-Lactoglobulin Adduct.

Monti, D.M., Loreto, D., Iacobucci, I., Ferraro, G., Pratesi, A., D'Elia, L., Monti, M., Merlino, A.

(2022) Pharmaceuticals (Basel) 15

• PubMed: 35455422 
• DOI: https://doi.org/10.3390/ph15040425
• Primary Citation Related Structures: 
  7NQB


• PubMed Abstract: 
  

  β-lactoglobulin is the major component of whey. Here, the adduct formed upon the reaction of the protein with oxaliplatin (OXA) has been prepared, structurally characterized by X-ray crystallography and electrospray ionization-mass spectrometry, and evaluated as a cytotoxic agent. The data demonstrate that OXA rapidly binds β-lactoglobulin via coordination with a Met7 side chain upon release of the oxalate ligand. The adduct is significantly more cytotoxic than the free drug and induces apoptosis in cancer cells. Overall, our results suggest that metallodrug/β-lactoglobulin adducts can be used as anticancer agents and that the protein can be used as a metallodrug delivery system.

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Organizational Affiliation: 
• Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario di Monte Sant'Angelo, Via Cintia, 21, 80126 Napoli, Italy.
CEINGE Advanced Biotechnologies s.c.a.r.l., Via G. Salvatore 486, 80145 Napoli, Italy.
Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: mass spectrometry

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 36.8 kDa 
• Atom Count: 2,592 
• Modeled Residue Count: 319 
• Deposited Residue Count: 324 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-lactoglobulin	A [auth AAA], B [auth BBB]	162	Bos taurus	Mutation(s): 0
UniProt
Find proteins for P02754 (Bos taurus) Explore P02754  Go to UniProtKB:  P02754

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PT (Subject of Investigation/LOI)	C [auth AAA]	PLATINUM (II) ION Pt HRGDZIGMBDGFTC-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.01 Å
• R-Value Free:  0.284 (Depositor), 0.284 (DCC) 
• R-Value Work:  0.212 (Depositor), 0.218 (DCC) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 35.87	α = 90
b = 112.58	β = 117.637
c = 38.08	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
MOSFLM	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2022-03-23 
Deposition Author(s): Merlino, A., Loreto, D., Ferraro, G.

Revision History  

• Version 1.0: 2022-03-23
  Type: Initial release
  
• Version 1.1: 2022-05-04
  Changes: Database references
• Version 1.2: 2024-01-31
  Changes: Data collection, Derived calculations, Refinement description
• Version 1.3: 2024-11-20
  Changes: Structure summary