Reception of the energy level in bacterial taxis

Glagolev, A.N.

doi:10.1016/0022-5193(80)90097-1

Cited by 61 publications

(40 citation statements)

References 32 publications

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“…The sensing of A/~H+, suggested to account for taxis away from uncouplers, phototaxis and aerotaxis [20], was found to be independent of MCP in E. coli [9][10][11]. Here, however, we find that in H. halobium, A/2H +-sensing employs an information processing pathway that is analogous to the one found in ordinary chemoreception.…”

Section: Discussionmentioning

confidence: 47%

The role of methylation in the taxis of Halobacterium halobium to light and chemo‐effectors

1982

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In Halobaeterium halobium tactic responses towards light and chemoeffectors are accompanied by changes in the methylation level of methyl-accepting chemotaxis proteins (MCP). Taxis towards green light absorbed by the bacteriorhodopsin proton pump appears to be governed by A/t H +-sensing. The addition of CCCP, an uncoupler, prevented the increase of MCP methylation in response to green light illumination, but had no effect on CH3-incorporation followed by the addition of the attractants glucose, leucine and histidine: Similarly, CCCP did not change MCP demethylation in response to blue light illumination, a repelling stimuli. The sensitivity to an uncoupler of methylation linked to AFt H+-mediated green light taxis is to be expected, while the independence of demethylation caused by the blue light of CCCP is an indication that in the latter case a specific photoreceptor governs phototaxis. Informed processing from the blue light receptor to MCP does not involve a change in the membrane potential. Halobacterium halobium photobehavior a~H+-sensing Protein methylation Blue-light taxis

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Section: Discussionmentioning

confidence: 47%

The role of methylation in the taxis of Halobacterium halobium to light and chemo‐effectors

1982

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“…Oxygen stimulates electron transport through the electron transport system, increasing the proton motive force (2,3). A postulated aerotaxis-transducing protein responds to the increase in electron transport͞proton motive force and initiates a signal for the behavioral response to oxygen (3)(4)(5)(6). Chemicals other than oxygen that stimulate electron transport also elicit an aerotaxis-like behavioral response in bacteria (5,7,8).…”

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confidence: 99%

The Aer protein and the serine chemoreceptor Tsr independently sense intracellular energy levels and transduce oxygen, redox, and energy signals for Escherichia coli behavior

Rebbapragada

Johnson

Harding

et al. 1997

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

259

350

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We identified a protein, Aer, as a signal transducer that senses intracellular energy levels rather than the external environment and that transduces signals for aerotaxis (taxis to oxygen) and other energy-dependent behavioral responses in Escherichia coli. Domains in Aer are similar to the signaling domain in chemotaxis receptors and the putative oxygen-sensing domain of some transcriptional activators. A putative FAD-binding site in the N-terminal domain of Aer shares a consensus sequence with the NifL, Bat, and Wc-1 signal-transducing proteins that regulate gene expression in response to redox changes, oxygen, and blue light, respectively. A double mutant deficient in aer and tsr, which codes for the serine chemoreceptor, was negative for aerotaxis, redox taxis, and glycerol taxis, each of which requires the proton motive force and͞or electron transport system for signaling. We propose that Aer and Tsr sense the proton motive force or cellular redox state and thereby integrate diverse signals that guide E. coli to environments where maximal energy is available for growth.

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“…Energy taxis encompasses aerotaxis, phototaxis, redox taxis, taxis to alternative electron acceptors, and chemotaxis to oxidizable substrates (3,40,41). Through energy taxis, bacteria seek the most favorable environment supporting optimal cellular energy levels (13,27,38,40,41). In Escherichia coli, chemotaxis to most chemical stimuli does not require their metabolism (1).…”

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confidence: 99%

Energy Taxis Is the Dominant Behavior in Azospirillum brasilense

2000

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Energy taxis encompasses aerotaxis, phototaxis, redox taxis, taxis to alternative electron acceptors, and chemotaxis to oxidizable substrates. The signal for this type of behavior is originated within the electron transport system. Energy taxis was demonstrated, as a part of an overall behavior, in several microbial species, but it did not appear as the dominant determinant in any of them. In this study, we show that most behavioral responses proceed through this mechanism in the alpha-proteobacterium Azospirillum brasilense. First, chemotaxis to most chemoeffectors typical of the azospirilla habitat was found to be metabolism dependent and required a functional electron transport system. Second, other energy-related responses, such as aerotaxis, redox taxis, and taxis to alternative electron acceptors, were found in A. brasilense. Finally, a mutant lacking a cytochrome c oxidase of the cbb 3 type was affected in chemotaxis, redox taxis, and aerotaxis. Altogether, the results indicate that behavioral responses to most stimuli in A. brasilense are triggered by changes in the electron transport system.

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Reception of the energy level in bacterial taxis

Cited by 61 publications

References 32 publications

The role of methylation in the taxis of Halobacterium halobium to light and chemo‐effectors

The role of methylation in the taxis of Halobacterium halobium to light and chemo‐effectors

The Aer protein and the serine chemoreceptor Tsr independently sense intracellular energy levels and transduce oxygen, redox, and energy signals for Escherichia coli behavior

Energy Taxis Is the Dominant Behavior in Azospirillum brasilense

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