UNIGE document Scientific Article
previous document  unige:21326  next document
add to browser collection
Title

Charge dependent substrate activity of C3' and N3 functionalized, organometallic technetium and rhenium-labeled thymidine derivatives toward human thymidine kinase 1

Authors
Struthers, Harriet
Viertl, David
Kosinski, Marek
Spingler, Bernhard
Schibli, Roger
Published in Bioconjugate Chemistry. 2010, vol. 21, no. 4, p. 622-634
Abstract Human cytosolic thymidine kinase (hTK1) has proven to be a suitable target for the noninvasive imaging of cancer cell proliferation using radiolabeled thymidine analogues such as [(18)F]3'-fluoro-3'-deoxythymidine ([(18)F]FLT). A thymidine analogue for single photon emission computed tomography (SPECT), which incorporates the readily available and inexpensive nuclide technetium-99m, would be of considerable practical interest. hTK1 is known to accommodate modification of the structure of the natural substrate thymidine at the positions N3 and C3' and, to a lesser extent, C5. In this work, we used the copper-catalyzed azide-alkyne cycloaddition to synthesize two series of derivatives in which thymidine is functionalized at either the C3' or N3 position with chelating systems suitable for the M(CO)(3) core (M = (99m)Tc, Re). The click chemistry approach enabled complexes with different structures and overall charges to be synthesized from a common precursor. Using this strategy, the first organometallic hTK1 substrates in which thymidine is modified at the C3' position were identified. Phosphorylation of the organometallic derivatives was measured relative to thymidine. We have shown that the influence of the overall charge of the derivatives is dependent on the position of functionalization. In the case of the C3'-functionalized derivatives, neutral and anionic substrates were most readily phosphorylated (20-28% of the value for the parent ligand thymidine), whereas for the N3-functionalized derivatives, cationic and neutral complexes were apparently better substrates for the enzyme (14-18%) than anionic derivatives (9%).
Keywords Alkynes/chemistryAzides/chemistryCatalysisCopper/chemistryCrystallography, X-RayCyclizationHumansModels, MolecularMolecular StructureOrganometallic Compounds/chemical synthesis/*chemistryRhenium/*chemistryStaining and LabelingStereoisomerismTechnetium/*chemistryThymidine/*chemistry/*metabolismThymidine Kinase/*chemistry/*metabolism
Identifiers
PMID: 20359195
Full text
Article - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://pubs.acs.org/doi/pdfplus/10.1021/bc900380n
Structures
Research group Ciblage tumoral par anticorps, peptides et nucléotides radiomarqués (221)
Citation
(ISO format)
STRUTHERS, Harriet et al. Charge dependent substrate activity of C3' and N3 functionalized, organometallic technetium and rhenium-labeled thymidine derivatives toward human thymidine kinase 1. In: Bioconjugate Chemistry, 2010, vol. 21, n° 4, p. 622-634. https://archive-ouverte.unige.ch/unige:21326

181 hits

0 download

Update

Deposited on : 2012-05-23

Export document
Format :
Citation style :