Abstract
Insect microbial symbionts are considered as a promising source of new bioactive natural products. There are no previous chemical studies describing the bacteria associated with Atta sexdens rubropilosa, a leaf-cutting ant common in Brazil. We have been investigating the antibiotic natural products produced by bacteria isolated from A. sexdens rubropilosa nests. A total of 23 bacteria strains were isolated from ants' bodies, eight from the fungal garden and seven from de colony waste. The isolated bacteria inhibited the growth of the human pathogenic microorganisms Proteus mirabilis ATCC 29906, Staphylococcus aureus ATCC 3538 and Candida albicans ATCC 10231 in prelimanary agar difusion antimicrobial assays. One bacterial strain isolated from ants' bodies, nine from fungal garden and one from waste inhibited the S. aureus ATCC 3538 growth. Only one bacterial strain, isolated from ants' bodies, inhibited the growth of P. mirabilis ATCC 29906. The C. albicans ATCC 10231 growth was inhibited by eight bacteria isolated from the fungal garden. The antibiotic natural products prodigiosin and serratamolide have already been identified from a red bacteria isolated from ants' bodies using HR-ESI-MS and ESI-MS/MS.
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