Studies on Cultural Conditions for the Production of Antibiotic Bacitracin by Bacillus Lichenformis.

The marine ecosystem contains a solution for food, shelter, pharmaceutical problems and has a key role in the economy of the country as tourism. The Gulf of Kachchh, known for its high tides and the coral reefs are less explored for its antibiotic activity due to the coral bleaching and diseases. The bacterial strains in the coral Porites lutea are determined to possess antibiotic activity against bacterial strains such as E.coli, P. aeruginosa, S. aureus and S. faecalis. Among thirty bacterial strains isolated from the tissue, skeleton and mucus, two bacterial strains resulted in the better antagonistic activity. The antibiotic compound extracted from both the bacteria elucidated to be 4-[(2E)-4-hydroxypent-2-en-1-yl]-5,6-dihydro-2H-pyran-2-one. Further, through ADMET prediction it was inferred that it is an effective drug lead as it reports less toxicity and better drug-likeliness. The study also includes the effect of Poly Hydroxy Butarate (PHB) production by the isolated bacterial strain. 

Isolation of moderately halotolerant bacterial strains, associated with coral Porites lutea from Gulf of Kachchh: Antibacterial activity and PHB production.

Article history: Received on: 29/04/2013 Revised on: 02/06/2013 Accepted on: 17/06/2013 Available online: 27/06/2013 This study reports the antibacterial activity of coral reef associated bacteria against bacterial pathogens and optimization of metabolite production. Twelve morphologically different bacterial were isolated from stony coral reef collected from Rameshwaram coastal area, Tamil Nadu. Cell free supernatant of all the bacterial isolates were tested against Staphylococcus aureus, Bacillus cereus, Salmonella typhi, Escherichia coli, and Klebsiella pneumoniae by agar well diffusion method. Of the 12 isolates tested, seven isolates showed antibacterial activity again at least one of the test organisms with the zone of inhibition in the range of 9-14 mm. The antibacterial compounds were extracted from the cell free supernatant using ethyl acetate and tested for antibacterial activity. In diffusion method, crude extract from strain RC12 showed 11-17 mm inhibition against all the test pathogens and the same was selected for optimization studies. Effect of culture conditions and medium components such as different carbon, nitrogen, mineral, pH, temperature on antibacterial metabolite production was studied by adopting one-factor-at-atime method. The metabolite production was influenced by lactose, ammonium sulphate, K2HPO4 while the optimal cultivation conditions were pH 7 and 37°C. The potent strain RC12 was identified as Pseudomonas sp based on their phenotypic and biochemical characteristics. The finding of the present study concludes that coral reef bacteria found to be the best source for bioactive metabolites with broad spectrum activity.

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Invitro Antibacterial Activity of Coral Reef Associated Bacteria and Optimization of Bioactive Metabolite Production

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Invitro Antibacterial Activity of Coral Reef Associated Bacteria and Optimization of Bioactive Metabolite Production