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Background  Colon cancer is the third most commonly diagnosed cancer worldwide, with a commensurately high mortality rate. The search for novel antioxidants and specific anticancer agents which may inhibit, delay or reverse the development of colon cancer is thus an area of great interest;  Streptomyces  bacteria have been demonstrated to be a source of such agents.    Results  The extract from  Streptomyces  sp. MUM265— a strain which was isolated and identified from Kuala Selangor mangrove forest, Selangor, Malaysia— was analyzed and found to exhibit antioxidant properties as demonstrated via metal-chelating ability as well as superoxide anion, DPPH and ABTS radical scavenging activities. This study also showed that MUM265 extract demonstrated cytotoxicity against colon cancer cells as evidenced by the reduced cell viability of Caco-2 cell line. Treatment with MUM265 extract induced depolarization of mitochondrial membrane potential and accumulation of subG 1  cells in cell cycle analysis, suggesting that MUM265 exerted apoptosis-inducing effects on Caco-2 cells.    Conclusion  These findings indicate that mangrove derived  Streptomyces  sp. MUM265 represents a valuable bioresource of bioactive compounds for the future development of chemopreventive agents, with particular promise suggested for treatment of colon cancer.    Electronic supplementary material  The online version of this article (10.1186/s12866-019-1409-7) contains supplementary material, which is available to authorized users.

Mangrove derived Streptomyces sp. MUM265 as a potential source of antioxidant and anticolon-cancer agents