Molecular characterization of marine pigmented bacteria showing antibacterial activity

In the present study 6 pigmented marine bacterial (PMB) strains BNO10, BNO20, BSO14, BNY11, CSP15 and BNB21 from marine sediment and 2 strains BWR18 and BWCY16 from seawater sample were isolated on Zobell Marine agar. These PMB appeared to be in blue, orange, pink, red, dark brownish yellow and yellowish green in colour. Phylogenetic analysis on the basis of small subunit ribosomal RNA (16s rRNA) gene partial sequence homologies of these isolates were identified as Bacillus flexus (BNY11, BWR18), Micrococcus luteus (BWCY16), Photobacterium ganghwense (CSP15), Stenotrophomonas maltophilia (BNO10, BNO20, BSO14), and Vibrio sp. (BNB21). Large and clear zones of inhibition formed by these bacteria against different human pathogenic bacteria were detailed.