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- W4220747342 abstract "Synthetic and naturally occurring siderophores and their conjugates provide access to the bacterial cytoplasm via active membrane transport. Previously, we displaced iron with the radioactive isotope 67Ga to quantify and track in vitro and in vivo uptake and distribution of siderophore Trojan Horse antibiotic conjugates. Here, we introduce a multi-isotope tagging strategy to individually elucidate the fate of metal cargo and the ligand construct with radioisotopes 67Ga and 124I. We synthesized gallium(III) model complexes of a ciprofloxacin-functionalized linear desferrichrome (Ga-D6) and deferoxamine (Ga-D7) incorporating an iodo-tyrosine linker to enable radiolabeling using the metal-binding (67Ga) and the cargo-conjugation site (124I). Radiochemical experiments with Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa wt strains show that 67Ga-D6/D7 and Ga-D6-124I/D7-124I have comparable uptake, indicating intact complex import and siderophore-mediated uptake. In naive mice, 67Ga-D6/D7 and Ga-D6-124I/D7-124I demonstrate predominantly renal clearance; urine metabolite analysis indicates in vivo dissociation of Ga(III) is a likely mechanism of degradation for 67Ga-D6/D7 when compared to ligand radiolabeled compounds, Ga-D6-124I/D7-124I, which remain >60% intact in urine. Cumulatively, this work demonstrates that a multi-isotope tagging strategy effectively elucidates the in vitro uptake, pharmacokinetics, and in vivo stability of xenometallomycins with modular chemical structures." @default.
- W4220747342 created "2022-04-03" @default.
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- W4220747342 date "2022-03-23" @default.
- W4220747342 modified "2023-10-18" @default.
- W4220747342 title "Tracking Uptake and Metabolism of Xenometallomycins Using a Multi-Isotope Tagging Strategy" @default.
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- W4220747342 doi "https://doi.org/10.1021/acsinfecdis.2c00005" @default.
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