Siderophores are small molecules produced by bacteria under iron-scarcity conditions faced by bacteria inside
host. Sideophores bind iron with high affinity (Kd < 10-25 M) and are required for iron transport into the bacterial cell.
Small molecules interfering with siderophore functioning can be promising anti-mycobacterial agents. Several molecules
with hydrazone as a structural feature are known to have metal chelating property. This prompted us to investigate the metal
chelating ability of 2-hydrazino-pyrimidin-4(3H)-one derivatives. In this light, a library of 22 novel molecules with 2-
hydrazino-pyrimidin-4(3H)-one moiety was synthesized and the compounds were evaluated against M. tuberculosis under
iron-limiting and iron-rich conditions. Interestingly, several molecules showed promising (MIC:<10M) selective activity
under iron scarcity conditions. Furthermore, compounds were found to be nontoxic at lower concentration in VERO cell
lines using MTT assay. Taken together, we have discovered novel 2-hydrazino-pyrimidin-4(3H)-one molecules active
against M. tuberculosis which can be developed as potent antimycobacterial agents.
Keywords: 2-hydrazino-pyrimidin-4(3H)-one, Iron scarcity, Siderophore, Antitubercular
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