5KID

Tightening the Recognition of Tetravalent Zr and Th Complexes by the Siderophore-Binding Mammalian Protein Siderocalin for Theranostic Applications


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Engineered Recognition of Tetravalent Zirconium and Thorium by Chelator-Protein Systems: Toward Flexible Radiotherapy and Imaging Platforms.

Captain, I.Deblonde, G.J.Rupert, P.B.An, D.D.Illy, M.C.Rostan, E.Ralston, C.Y.Strong, R.K.Abergel, R.J.

(2016) Inorg Chem 55: 11930-11936

  • DOI: 10.1021/acs.inorgchem.6b02041
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Targeted α therapy holds tremendous potential as a cancer treatment: it offers the possibility of delivering a highly cytotoxic dose to targeted cells while minimizing damage to surrounding healthy tissue. The metallic α-generating radioisotopes 225A ...

    Targeted α therapy holds tremendous potential as a cancer treatment: it offers the possibility of delivering a highly cytotoxic dose to targeted cells while minimizing damage to surrounding healthy tissue. The metallic α-generating radioisotopes 225Ac and 227Th are promising radionuclides for therapeutic use, provided adequate chelation and targeting. Here we demonstrate a new chelating platform composed of a multidentate high-affinity oxygen-donating ligand 3,4,3-LI(CAM) bound to the mammalian protein siderocalin. Respective stability constants log β110 = 29.65 ± 0.65, 57.26 ± 0.20, and 47.71 ± 0.08, determined for the EuIII (a lanthanide surrogate for AcIII), ZrIV, and ThIV complexes of 3,4,3-LI(CAM) through spectrophotometric titrations, reveal this ligand to be one of the most powerful chelators for both trivalent and tetravalent metal ions at physiological pH. The resulting metal-ligand complexes are also recognized with extremely high affinity by the siderophore-binding protein siderocalin, with dissociation constants below 40 nM and tight electrostatic interactions, as evidenced by X-ray structures of the protein:ligand:metal adducts with ZrIV and ThIV. Finally, differences in biodistribution profiles between free and siderocalin-bound 238PuIV-3,4,3-LI(CAM) complexes confirm in vivo stability of the protein construct. The siderocalin:3,4,3-LI(CAM) assembly can therefore serve as a "lock" to consolidate binding to the therapeutic 225Ac and 227Th isotopes or to the positron emission tomography emitter 89Zr, independent of metal valence state.


    Organizational Affiliation

    Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Neutrophil gelatinase-associated lipocalin
A, B, C
180Homo sapiensMutation(s): 0 
Gene Names: LCN2 (HNL, NGAL)
Find proteins for P80188 (Homo sapiens)
Go to Gene View: LCN2
Go to UniProtKB:  P80188
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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Download CCD File 
A, C
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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A, C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
7K9
Query on 7K9

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Download CCD File 
A, B, C
N,N'-(butane-1,4-diyl)bis(N-{3-[(2,3-dihydroxybenzene-1-carbonyl)amino]propyl}-2,3-dihydroxybenzamide)
C38 H42 N4 O12
WNIXXCINEMCWIS-UHFFFAOYSA-N
 Ligand Interaction
TH
Query on TH

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Download CCD File 
A, B, C
THORIUM ION
Th
YMURPAJPLBCAQW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.232 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 115.547α = 90.00
b = 115.547β = 90.00
c = 118.028γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-04-26
    Type: Initial release
  • Version 1.1: 2017-09-27
    Type: Database references