NDLI: Excitation signal processing times in Halobacterium halobium phototaxis.

Content Provider	PubMed Central
Author	Sundberg, S. A. Alam, M. Spudich, J. L.
Abstract	Phototaxis responses of Halobacterium halobium were monitored with a computerized cell-tracking system coupled to an electronic shutter controlling delivery of photostimuli. Automated analysis of rates of change in direction and linear speeds provided detection of swimming reversals with 67 ms resolution, permitting measurement of distinct phases of the responses to attractant and repellent stimuli. After stimulation, there was a latency period in which the population reversal frequency was unchanged, followed by an excitation phase in which reversal frequency increased, and a slower adaptation phase in which reversal frequency returned to its prestimulus value. A step-decrease in illumination of the attractant receptor slow-cycling or sensory rhodopsin (SR) (lambda max, 587 nm) was interpreted by the cells as an unfavorable stimulus and, after a minimum latency of 0.70 +/- 0.14 s, induced swimming reversals with the peak response occurring 1.34 +/- 0.07 s after onset of the stimulus. Two distinct repellent responses in the near UV/blue were observed. One was a reversal response to 400 nm light, which was dependent on orange-red background illumination as expected for the photointermediate repellent form of SR (lambda max, 373 nm). The minimum latency of this response was approximately the same as that of the SR attractant system. The second was a reversal response with shorter minimum latency (0.40 +/- 0.07 s) to light of longer wavelength (450 nm) than absorbed by the known SR repellent form. This result confirms recent findings of an additional repellent photosystem in this spectral range. Further, the longer wavelength repellent response is independent of orange-red background illumination, indicating that the photoreceptor mediating this response is not a photointermediate of SR.
Related Links	http://dx.doi.org/10.1016/s0006-3495(86)83530-5
Ending Page	900
Page Count	6
Starting Page	895
File Format	PDF
ISSN	00063495
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	5
Volume Number	50
Language	English
Publisher Date	1986-11-01
Access Restriction	Open
Subject Keyword	Biophysics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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