Abstract
Prodigiosin, a pink-red pigment produced by many soil isolates of Serratia marcescens as well as by some marine bacterial isolates, is well documented for its bioactive properties. Here, we report the production of prodigiosin by an endofungal bacterium Serratia marcescens D1. The growth characteristics and pigment production were optimized for the bacterial isolate in liquid culture. The bacterial isolate was able to grow abundantly up to 35°C, while maximum pigment production was recorded between 25–30°C, and at pH 5. The pink-red pigment was isolated from the bacterial culture and purified using thin-layer chromatography. The identity of prodigiosin was confirmed by liquid chromatography—electrospray ionization—mass spectrometry (LC-ESI-MS). Antibacterial activity of prodigiosin was assessed against gram-positive and gram-negative bacteria. Prodigiosin showed potent antibacterial activity against gram-positive bacteria, while very low antibacterial activity was observed against gram-negative bacteria used in this study. The minimum inhibitory concentrations (MIC) of prodigiosin against Staphylococcus aureus, Bacillus subtilis and B. cereus were recorded as 3, 5, and 4 µg/mL, respectively. The pigment was able to cause damages to the plasma membrane of Bacillus subtilis and inhibited biofilm formation in B. subtilis and B. cereus, suggesting its active role against biofilm-derived antimicrobial resistance.
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ACKNOWLEDGMENTS
The authors are grateful to the Department of Biotechnology, Govt. of India for providing funds for conducting the research work under the project sanction number BT/552/NE/U-Excel/2014. The authors are grateful to the Department of Agricultural Biotechnology and DBT-North East Centre for Agricultural Biotechnology, Assam Agricultural University for providing laboratory space and required facilities for carrying out the study. The authors also thank Guwahati Biotech Park Incubation Centre (GBPIC), Guwahati Biotech Park, Guwahati, for providing the LC-ESI-MS facility.
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This study was funded by the Department of Biotechnology (DBT), Government of India under the project sanction number BT/552/NE/U-Excel/2014, without any influence over the study design, experimental procedures, data collection, results or the decision to publish this article.
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RCB conceived the idea and acquired funding; DJH and RCB designed the experiments; DJH optimized the pigment production, prepared the manuscript and figures; DJH, RK and TG isolated, purified and characterized the pigment; DJH and MK performed all the bioactivities; DJH and GG analyzed the data; MB and RCB provided technical supervision throughout the study; all the authors read, critically revised and agreed to the contents of the manuscript.
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#Current affiliation: Royal School of Bio-Sciences, Royal Global University, Assam, Guwahati-781035 India.
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Hazarika, D.J., Kakoti, M., Kalita, R. et al. Prodigiosin from an Endofungal Bacterium Serratia marcescens D1 Inhibits Biofilm Formation in Gram-Positive Bacteria. Microbiology 90, 829–838 (2021). https://doi.org/10.1134/S0026261722010052
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DOI: https://doi.org/10.1134/S0026261722010052