A rare earth-DOTA-binding antibody

Probe properties and binding affinity across the lanthanide series

Todd M. Corneillie, Paul A. Whetstone, Andrew J Fisher, Claude F. Meares

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

An antibody that binds rare earth complexes selectively could be used as a docking station for a set of probe molecules, of particular interest for medical imaging and therapy. The rare earths are rich in probe properties, such as the paramagnetism of Gd, the luminescence of Tb and Eu, and the nuclear properties of Lu and Y. We find that antibody 2D12.5, initially developed to bind analogues of Y-DOTA (1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴-tetraacetic acid) for radiotherapy, binds not only Y-DOTA analogues but also analogous DOTA complexes of all of the lanthanides. Surprisingly, chelates of some metals such as Gd3+ bind more tightly than the original Y3+ complex. When the shape of the complex is perturbed by either increasing or decreasing the radius of the lanthanide ion, the thermodynamic stability of the protein-ligand complex changes in a regular fashion. The behavior of ΔΔG as a function of ionic radius fits a parabola, as might be expected for a system that behaves in a thermodynamically elastic way. The broad specificity and high affinity of this antibody for all rare earth-DOTA complexes make it particularly interesting for applications that take advantage of the unique characteristics of lanthanides. For example, UV excitation of the Tb-DOTA-2D12.5 complex leads to energy transfer from aromatic side chains of the antibody to bound Tb-DOTA, enhancing green terbium luminescence >104 relative to unbound Tb-DOTA.

Original languageEnglish (US)
Pages (from-to)3436-3437
Number of pages2
JournalJournal of the American Chemical Society
Volume125
Issue number12
DOIs
StatePublished - Mar 26 2003

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Lanthanoid Series Elements
Rare earth elements
Antibodies
Rare earths
Luminescence
Terbium
Nuclear properties
Antibody Affinity
Protein Stability
Energy Transfer
Diagnostic Imaging
Paramagnetism
Thermodynamics
Medical imaging
Radiotherapy
Metals
Energy transfer
Ions
Ligands
Acids

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

A rare earth-DOTA-binding antibody : Probe properties and binding affinity across the lanthanide series. / Corneillie, Todd M.; Whetstone, Paul A.; Fisher, Andrew J; Meares, Claude F.

In: Journal of the American Chemical Society, Vol. 125, No. 12, 26.03.2003, p. 3436-3437.

Research output: Contribution to journalArticle

Corneillie, Todd M. ; Whetstone, Paul A. ; Fisher, Andrew J ; Meares, Claude F. / A rare earth-DOTA-binding antibody : Probe properties and binding affinity across the lanthanide series. In: Journal of the American Chemical Society. 2003 ; Vol. 125, No. 12. pp. 3436-3437.
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