Isolation and characterization of Chromobacterium violaceum and antibacterial activities of its metabolite violacein

Authors

  • Shah Md Minhajul Abedin Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh
  • Mithu Rani Tarafdar Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh
  • Avirup Saha Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh
  • Atiqua Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh
  • Samiur Rahim Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh
  • Muhammad Manjurul Karim Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh
  • Shakila Nargis Khan Fermentation and Enzyme Biotechnology Laboratory, Department of Microbiology, University of Dhaka, Dhaka-1000, Bangladesh

DOI:

https://doi.org/10.3329/dujbs.v33i1.72487

Keywords:

Violacein, pigment, Chromobacterium violaceum, antibacterial

Abstract

Violacein is a naturally-occurring bacterial secondary metabolite which is known to demonstrate a wide range of biological properties including antibacterial, antifungal, antiviral as well as anticancer and antitumor activities. Bacteria belonging to the genus Chromobacterium are the most studied microorganisms for violacein production. In this study, indigenous violacein-producing Chromobacterium violaceum was isolated from water and sediment samples of Bijaypur white clay hill lake, Netrokona, Bangladesh, and identified by biochemical and molecular characterization. After confirming the presence of the vioB gene in a polymerase chain reaction, crude violacein was purified from C. violaceum CV1 by ethanol extraction followed by filtration through 0.22 µm syringe filters. The partially-purified pigment exhibited significant antibacterial activity against three Gram-positive pathogens; Staphylococcus aureus, Streptococcus sp, and Listeria monocytogenes, with the later demonstrating the highest sensitivity. The bactericidal activity was more pronounced when combined with an antibiotic, thereby producing a drug-metabolite synergistic antibacterial activity.

Dhaka Univ. J. Biol. Sci. 33(1): 109-119, 2024 (January)

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Published

2024-04-08

How to Cite

Abedin, S. M. M. ., Tarafdar, M. R. ., Saha, A. ., Atiqua, Rahim, S., Karim, M. M. . ., & Khan, S. N. . (2024). Isolation and characterization of Chromobacterium violaceum and antibacterial activities of its metabolite violacein . Dhaka University Journal of Biological Sciences, 33(1), 109–119. https://doi.org/10.3329/dujbs.v33i1.72487

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