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  • New Fluorescent Iron Chelator In Infection

    From ironjustice@21:1/5 to All on Wed May 30 19:34:31 2018
    New fluorescent rosamine chelator showing promising antibacterial activity against Gram-positive bacteria.
    Novais Â1, Moniz T2, Rebelo AR1, Silva AMG2, Rangel M3, Peixe L4.
    Bioorg Chem. 2018 May 15;79:341-349. doi: 10.1016/j.bioorg.2018.05.013. Abstract
    The restricted number of antibiotics to treat infections caused by common multidrug resistant bacterial pathogens in the clinical setting demands a continuous search for new molecules with antibacterial properties. Bacterial iron deprivation represents a
    promising alternative, being iron chelators an attractive class for drug design in which particular compounds seem to have antibacterial effect. In this work, we report the synthesis and characterization of a new fluorescent 3-hydroxy-4-pyridinone (3,4-
    HPO) iron chelator functionalized with a carboxyrosamine fluorophore (MRB20). The antibacterial activity of MRB20 was assessed against representative strains from clinically relevant Gram-positive and Gram-negative bacterial species and further compared
    with the inhibitory effect of a set of structurally related iron chelators including Deferiprone (1,2-dimethyl-3-hydroxy-4-pyridinone). Compounds exhibiting a promising minimal inhibitory concentration (MIC < 10 mg/L) were further tested against a
    wider range of bacterial genera and species (Staphylococcus spp. Enterococcus spp. Listeria monocytogenes, Bacillus spp.), including multidrug resistant bacteria. With the exception of the novel compound (MRB20), all chelators inhibited the strains
    assayed at very high concentrations [minimum inhibitory concentrations (MIC) ranging from 70 mg/L to >180 mg/L]. MRB20 revealed a good antibacterial activity (6.7-13.2 mg/L) against Gram-positive strains from different genera and species, including
    clinically relevant species (Staphylococcus aureus, Staphylococcus epidermidis, Enterococcus faecium, Enterococcus faecalis), which might be eventually compatible with a therapeutic application or as adjuvant.

    KEYWORDS:
    3-hydroxy-4-pyridinone; Antibacterial activity; Bacteria; Chelator; Enterococcus sp.; Fluorescent; Gram-positive; Iron; Rhodamine; Staphylococcus sp.

    PMID: 29807207 DOI: 10.1016/j.bioorg.2018.05.013

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