Investigation and Conformational Analysis of Fluorinated Nucleoside Antibiotics Targeting Siderophore Biosynthesis

Surendra Dawadi, Kishore Viswanathan, Helena I. Boshoff, Clifton E. Barry, Courtney C. Aldrich

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


(Chemical Equation Presented) Antibiotic resistance represents one of the greatest threats to public health. The adenylation inhibitor 5′-O-[N-(salicyl)sulfamoyl]adenosine (SAL-AMS) is the archetype for a new class of nucleoside antibiotics that target iron acquisition in pathogenic microorganisms and is especially effective against Mycobacterium tuberculosis, the causative agent of tuberculosis. Strategic incorporation of fluorine at the 2′ and 3′ positions of the nucleoside was performed by direct fluorination to enhance activity and improve drug disposition properties. The resulting SAL-AMS analogues were comprehensively assessed for biochemical potency, whole-cell antitubercular activity, and in vivo pharmacokinetic parameters. Conformational analysis suggested a strong preference of fluorinated sugar rings for either a 2′-endo, 3′-exo (South), or a 3′-endo,2′-exo (North) conformation. The structure-activity relationships revealed a strong conformational bias for the C3′-endo conformation to maintain potent biochemical and whole-cell activity, whereas improved pharmacokinetic properties were associated with the C2′-endo conformation.

Original languageEnglish (US)
Pages (from-to)4835-4850
Number of pages16
JournalJournal of Organic Chemistry
Issue number10
StatePublished - May 15 2015

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© 2015 American Chemical Society.


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