Abstract
The influence of growth parameters on the production of bacteriocins (aureocins) by five strains of Staphylococcus aureus was investigated. These aureocins have a broad spectrum of activity and can inhibit important human and animal pathogens. All strains produced large inhibition zones upon the indicator strain when they were grown in rich media such as brain-heart infusion (BHI), N2GT and 2 × YT. Bacteriocin production was not influenced by the initial pH of the medium (6.0–8.0). At lower temperature (28 °C), there was a marked reduction in bacteriocin production. Incubation of the producers under anaerobiosis affected profoundly the production of two related bacteriocins, aureocins MB92 and 146L, and slightly increased the production of aureocins A53 and 215FN. Production of aureocins MB92 and 215FN was apparently abolished in media containing ≥ 2.5 g and ≥ 3.5 g Nacl/100 ml, respectively. Although production of the remaining aureocins was observed in all NaCl concentrations tested (0.5–7.5 g/100 ml), the larger inhibition zones were detected in media containing up to either 1.5 g (for aureocins A70 and 146L) or 2.5 g NaCl/100 ml (for aureocin A53). Aureocin 215FN could not be detected in the culture supernatant. For the remaining aureocins tested, the highest levels of bacteriocin production occurred in either the late-log or early stationary growth phase of cultures grown in BHI medium at 37 °C. Changes in environmental conditions can, therefore, have detrimental effects on the production of active aureocins. Such factors are relevant when considering the potential biotechnological applications of these substances and when testing new S. aureus isolates for bacteriocin production.
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Nascimento, J.d.S., Abrantes, J., Giambiagi-deMarval, M. et al. Growth conditions required for bacteriocin production by strains of Staphylococcus aureus. World J Microbiol Biotechnol 20, 941–947 (2004). https://doi.org/10.1007/s11274-004-3626-x
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DOI: https://doi.org/10.1007/s11274-004-3626-x