Gram-negative marine bacteria are an underexplored source of new chemical entities for a wide range of applications. Even though, some have shown a high antitumor activity. This chapter describes an isolation and screening protocol based on the Dilution-to-Extinction approach coupled with an antiproliferative test oriented to the discovery of new cytotoxic compounds synthesized by marine bacteria. In addition to the discovery of new bioactive secondary metabolites, this protocol provides a high-throughput isolation and screening platform for discarding no bioactive strains during the first steps of the drug discovery process.
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