Abstract
In this paper, we describe the UV and cold tolerance of a purple violet pigment (PVP)-producing Antarctic bacterium, Janthinobacterium sp. Ant5-2 (PVP+) and compared its physiological adaptations with a pigmentless mutant strain (PVP−). A spontaneous deletion of vioA that codes for tryptophan monooxygenase, the first gene involved in the biosynthesis of PVP was found in PVP− strain. The PVP− culture exhibited significantly reduced survival during exponential and stationary growth phase following exposure to UVB (320 nm) and UVC (254 nm) (dose range: 0–300 J/m²) when compared to wild-type (PVP+) cultures. In addition, upon biochemical inhibition of pigment synthesis by 2(5H)-furanone, wild-type PVP+ cultures exhibited approximately 50-fold growth reduction at a higher dose (300 J/m²) of UV. Increased resistance to UV was observed upon inducing starvation state in both PVP+ and PVP− cultures. There was 80 % (SD = ±8) reduction in extrapolymeric substance (EPS) production in the PVP− cultures along with a compromised survival to freeze–thaw cycles when compared to the PVP+ cultures. Perhaps synthesis of PVP and EPS are among the key adaptive features that define the survival of this bacterium in Antarctic extreme conditions, especially during austral summer months.
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Acknowledgments
We thank Col. (IL) J.N. Pritzker ARNG (Retired), Tawani Foundation (Chicago) for supporting the Tawani 2008 International Antarctic Scientific Expedition; Marty Kress, VCSI, Inc./NASA); NASA’s Astrobiology program; Dr. Rasik Ravindra, Director, NCAOR; 2008–2009 Maitri and Novolazarevskaya Station staffs; Maitri Cdrs. A. Chaturvedi, and Dr. P. Malhotra and Ashit Swain, Indian Geological Survey (Antarctic Division); and Richard B. Hoover (NASA) for assisting identification of the bacterial strain.
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Mojib, N., Farhoomand, A., Andersen, D.T. et al. UV and cold tolerance of a pigment-producing Antarctic Janthinobacterium sp. Ant5-2. Extremophiles 17, 367–378 (2013). https://doi.org/10.1007/s00792-013-0525-9
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DOI: https://doi.org/10.1007/s00792-013-0525-9