Screening of Bacillus sp. isolated from coral Siderastrea stellata for antimicrobial activity against enteropathogenic strains of Salmonella and Escherichia coli / Screening de Bacillus sp. isolados do coral Siderastrea stellata para atividade antimicrobiana contra linhagens enteropatogênicas de Salmonella e Escherichia coli

Suzana Rodrigues de Moura, Rachel Passos Rezende, Eric de Lima Silva Marques, Nathália Marjorie Carvalho, Bianca Mendes Maciel

Abstract


Siderastrea stellata is a coral endemic to Brazilian waters and is widely distributed throughout the coast of Bahia state. Exposure of the coral to pathogens stimulates the production of important enzymes by associated symbiont microorganisms. Besides being natural sources of bioactive compounds, these microorganisms possess characteristics that help them survive under extreme conditions. Sixty-eight bacterial strains isolated from the S. stellata coral were analyzed for antimicrobial activity against ten pathogenic bacteria. The cultivation of marine isolates was carried out in liquid or solid seawater. Eight isolates produced antimicrobial compounds against at least two of the ten pathogenic bacteria tested. When isolates were grown in Mueller-Hinton broth, a distinct biocidal spectrum was observed, indicating that the culture medium directly influences the production of antimicrobial compounds. Through molecular characterization of activity-positive isolates, they were identified as belonging to the genus Bacillus. The bioactive compounds produced by the Bacillus stratosphericus SS85 and SS69 strains were stable after storage time for three months. This is the first paper reporting on the antimicrobial activity of microorganisms isolated from coral Siderastrea stellata.


Keywords


marine water broth, marine water agar, antimicrobial compounds, marine microorganisms

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DOI: https://doi.org/10.34117/bjdv7n1-228

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