Bacterial Chemotaxis toward Environmental Pollutants: Role in Bioremediation

Pandey, Gyanendra; Jain, Rakesh

doi:10.1128/aem.68.12.5789-5795.2002

Cited by 274 publications

(171 citation statements)

References 69 publications

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“…Around plant roots, chemotaxis can guide free-living soil bacteria, for example those belonging to the Rhizobium species, to legume root hairs, favoring nitrogen fixation [9]. In the subsurface, chemotaxis can guide Pseudomonas putida and other species towards harmful organic compounds, favoring the bioremediation of contaminated sites [10]. In the ocean, chemotaxis allows bacteria to effectively utilize ephemeral resource hotspots, increasing the rate at which limiting elements are recycled and contributing to shape trophic interactions [11][12][13][14], thereby potentially enhancing biogeochemical fluxes [15][16][17].…”

Section: Bacterial Chemotaxis and Its Implicationsmentioning

confidence: 99%

Microfluidics for bacterial chemotaxis

2010

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Section: Bacterial Chemotaxis and Its Implicationsmentioning

confidence: 99%

Microfluidics for bacterial chemotaxis

2010

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“…Shewanella | flagella | motility | structured environment M otility is an important element of bacterial life in a range of different environments (1)(2)(3)(4)(5) and a driving factor in processes as diverse as the spreading of diseases and degradation of biomaterial (6,7). For active movement, many bacteria rely on flagella, long helical proteinaceous filaments extending from the cell's surface, which they rotate at the filament's base by a membrane-embedded motor and which allow effective swimming through liquid environments or swarming across surfaces (8).…”

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confidence: 99%

Bacteria exploit a polymorphic instability of the flagellar filament to escape from traps

Kühn

Schmidt

Eckhardt

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

130

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Many bacterial species swim by rotating single polar helical flagella. Depending on the direction of rotation, they can swim forward or backward and change directions to move along chemical gradients but also to navigate their obstructed natural environment in soils, sediments, or mucus. When they get stuck, they naturally try to back out, but they can also resort to a radically different flagellar mode, which we discovered here. Using high-speed microscopy, we monitored the swimming behavior of the monopolarly flagellated species Shewanella putrefaciens with fluorescently labeled flagellar filaments at an agarose-glass interface. We show that, when a cell gets stuck, the polar flagellar filament executes a polymorphic change into a spiral-like form that wraps around the cell body in a spiral-like fashion and enables the cell to escape by a screw-like backward motion. Microscopy and modeling suggest that this propagation mode is triggered by an instability of the flagellum under reversal of the rotation and the applied torque. The switch is reversible and bacteria that have escaped the trap can return to their normal swimming mode by another reversal of motor direction. The screw-type flagellar arrangement enables a unique mode of propagation and, given the large number of polarly flagellated bacteria, we expect it to be a common and widespread escape or motility mode in complex and structured environments.Shewanella | flagella | motility | structured environment

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“…Many investigations have suggested bioremediation as an alternative process for the removal of xenobiotic compounds from the soil, due to the smaller environmental impact, and greater efficiency (7,9,15,19,22).…”

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confidence: 99%