Zirconium Coordination Chemistry and Its Role in Optimizing Hydroxymate Chelation: Insights from Molecular Dynamics.
| Autor: | Sormani G; The 'Abdus Salam' International Centre for Theoretical Physics, I-34151 Trieste, Italy., Korde A; International Atomic Energy Agency, A-1400 Vienna, Austria., Rodriguez A; Dipartimento di Matematica e Geoscienze, University of Trieste, 34127 Trieste, Italy., Denecke M; International Atomic Energy Agency, A-1400 Vienna, Austria., Hassanali A; The 'Abdus Salam' International Centre for Theoretical Physics, I-34151 Trieste, Italy. |
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| Jazyk: | angličtina |
| Zdroj: | ACS omega [ACS Omega] 2023 Sep 19; Vol. 8 (39), pp. 36032-36042. Date of Electronic Publication: 2023 Sep 19 (Print Publication: 2023). |
| DOI: | 10.1021/acsomega.3c04083 |
| Abstrakt: | In the past decade, there has been a growth in using Zirconium-89 ( 89 Zr) as a radionuclide in nuclear medicine for cancer diagnostic imaging and drug discovery processes. Although one of the most popular chelators for 89 Zr, desferrioxamine (DFO) is typically presented as a hexadentate ligand, our work suggests a different scenario. The coordination structure of the Zr 4+ -DFO complex has primarily been informed by DFT-based calculations, which typically ignore temperature and therefore entropic and dynamic solvent effects. In this work, free energy calculations using molecular dynamics simulations, where the conformational fluctuations of both the ligand and the solvent are explicitly included, are used to compare the binding of Zr 4+ cations with two different chelators, DFO and 4HMS, the latter of which is an octadentate ligand that has been recently proposed as a better chelator due to the presence of four hydroxymate groups. We find that thermally induced disorder leads to an open hexadentate chelate structure of the Zr 4+ -DFO complex, leaving the Zr 4+ metal exposed to the solvent. A stable coordination of Zr 4+ with 4HMS, however, is formed by involving both hydroxamate groups and water molecules in a more closely packed structure. Competing Interests: The authors declare no competing financial interest. (© 2023 The Authors. Published by American Chemical Society.) |
| Databáze: | MEDLINE |
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