NDLI: Physiological adaptations and tolerance towards higher concentration of selenite (Se+4) in Enterobacter sp. AR-4, Bacillus sp. AR-6 and Delftia tsuruhatensis AR-7

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Caldinitratiruptor microaerophilus, gen. nov., sp. nov. isolated from a French hot spring (Chaudes-Aigues, Massif Central): a novel cultivated facultative microaerophilic anaerobic thermophile pertaining to the Symbiobacterium branch within the Firmicutes

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Physiological adaptations and tolerance towards higher concentration of selenite (Se+4) in Enterobacter sp. AR-4, Bacillus sp. AR-6 and Delftia tsuruhatensis AR-7

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Physiological adaptations and tolerance towards higher concentration of selenite (Se+4) in Enterobacter sp. AR-4, Bacillus sp. AR-6 and Delftia tsuruhatensis AR-7

Content Provider	Springer Nature Link
Author	Prakash, Dhan Pandey, Janmejay Tiwary, B. N. Jain, Rakesh K.
Copyright Year	2010
Abstract	Environmental contamination with selenium is a major health concern. A few bacterial strains have been isolated that can transform toxic selenite to non-toxic elemental selenium only at low concentrations (0.001–150 mM) in recent past. We have previously reported isolation and characterization of few selenite-tolerant bacterial strains. These strains were found to be resistant to selenite at (300–600 mM) concentrations. In the present study we have characterized some physiological adaptations of strains Enterobacter sp. AR-4, Bacillus sp. AR-6 and Delftia tsuruhatensis AR-7 during exposure to higher concentration of selenite under aerobic and anaerobic environments. Adaptive responses are largely associated with alteration of cell morphology and change in total cellular fatty acid composition. Interestingly, electron microscopy studies revealed substantial decrease in cell size and intracellular deposition of Se0 crystals when reduction is carried out under aerobic conditions. On the other hand, cell size increased with adhesion of Se0 on cell surface during anaerobic reduction. Fatty acid composition analysis demonstrated selective increase in saturated and cyclic fatty acids and decrease in unsaturated ones during aerobic transformation. Changes observed during anaerobic transformation were in surprising contrast as indicated by total absence of saturated and cyclic fatty acids. Results presented here provide evidences for putative occurrence of two distinct mechanisms involved in tolerance towards higher concentrations of selenite utilization under aerobic and anaerobic conditions. Further, prior exposure to higher concentration of Se+4 enabled rapid adaptation indicating role of inducible system in adaptation.
Starting Page	261
Ending Page	272
Page Count	12
File Format	PDF
ISSN	14310651
Journal	Extremophiles
Volume Number	14
Issue Number	3
e-ISSN	14334909
Language	English
Publisher	Springer Japan
Publisher Date	2010-03-16
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Selenite Toxicity Tolerance Physiological adaptations FAMEs analysis SEM and TEM Ecology Biotechnology Microbiology
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Medicine Microbiology

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Physiological adaptations and tolerance towards higher concentration of selenite (Se(+4)) in Enterobacter sp. AR-4, Bacillus sp. AR-6 and Delftia tsuruhatensis AR-7.

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Physiological adaptations and tolerance towards higher concentration of selenite (Se+4) in Enterobacter sp. AR-4, Bacillus sp. AR-6 and Delftia tsuruhatensis AR-7

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