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Temporal comparisons in bacterial chemotaxis.
Open accessAbstract
Responses of tethered cells of Escherichia coli to impulse, step, exponential-ramp or exponentiated sine-wave stimuli are internally consistent, provided that allowance is made for the nonlinear effect of thresholds. This result confirms that wild-type cells exposed to stimuli in the physiological range make short-term temporal comparisons extending 4 sec into the past: the past second is given a positive weighting, the previous 3 sec are given a negative weighting, and the cells respond to the difference. cheRcheB mutants (defective in methylation and demethylation) weight the past second in a manner similar to the wild type, but they do not make short-term temporal comparisons. When exposed to small steps delivered iontophoretically, they fail to adapt over periods of up to 12 sec; when exposed to longer steps in a flow cell, they partially adapt, but with a decay time of greater than 30 sec. cheZ mutants use a weighting that extends at least 40 sec into the past. The gain of the chemotactic system is large: the change in occupancy of one receptor molecule produces a significant response.
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Cited by
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Motifs, modules and games in bacteria
Wolf, D. M., & Arkin, A. P. (2003) · Current Opinion in Microbiology · doi:10.1016/s1369-5274(03)00033-x · Cited by 303
Friedrich, B. M., & Jülicher, F. (2007) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0703530104 · Cited by 287
Suzuki, H., Thiele, T. R., Faumont, S., Ezcurra, M., Lockery, S. R., & Schafer, W. R. (2008) · Nature · doi:10.1038/nature06927 · Cited by 256
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Metadata
- Authors
- Segall, J. E., Block, S. M., & Berg, H. C.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1986-12
- Volume
- 83
- Issue
- 23
- Pages
- 8987-8991
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2000329555
- Cited by
- 493
- References
- 0
- FWCI
- 2.21
- Type
- journal article
- Language
- en
- Open access
- green
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