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Secondary metabolites, particularly bioactive compounds, from probiotic bacteria, are good candidates for replacing antibiotics to which bacteria have become resistant. In order to compare bioactive crude material from strain SA14 of Brevibacillus laterosporus with two antibiotics, the MICs of this bioactive crude and those of antibiotics vancomycin and oxacillin, against methicillin-resistant Staphylococcus aureus (MRSA), were determined. The result indicated that the MIC (3.6-19.2 lg/ml) of bioactive crude was higher than vancomycin (MIC = 1.28-2.56 lg/ml) when tested against MRSA. Interestingly, all tested strains of MRSA were susceptible to bioactive crude and were approximately 5.2-fold more potent than oxacillin (MIC [ 100 lg/ml). Its activity against MRSA gives support for further evaluation, and the development of this substance for therapeutic use.

No abstract

Rapid emergence of methicillin-resistant Staphylococcus aureus (MRSA) has led to search of a novel bioactive compounds from natural resources. This study was aimed to determine the mode of action of bioactive compounds produced by Streptomyces sp. KB1 TISTR 2304 against MRSA, including cytotoxicity against mature brine shrimp. The mode of action and cytotoxicity of bioactive compounds were performed by observing the tested MRSA cells with a scanning electron microscope and evaluated by the brine shrimp lethality bioassay, respectively. The results indicated that bioactive compounds had the mode of action at the cell wall and also showed the moderate cytotoxic activity. This study concluded that the bioactive compounds produced from strain KB1 can be used as a model for novel anti-MRSA drug development.

No abstract