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. 1977 Jul;131(1):34–41. doi: 10.1128/jb.131.1.34-41.1977

Phototaxis and membrane potential in the photosynthetic bacterium Rhodospirillum rubrum.

S Harayama, T Iino
PMCID: PMC235387  PMID: 194880

Abstract

Cells of the photosynthetic bacterium Rhodospirillum rubrum cultivated anaerobically in light show phototaxis. The behavior of individual cells in response to the phenomenon is reversal(s) of the swimming direction when the intensity of the light available to them abruptly decreases. The tactic response was inhibited by antimycin, an inhibitor of the photosynthetic electron transfer system. The inhibitory effect of antimycin was overcome by phenazine methosulfate. Motility of the cells was not impaired by antimycin under aerobic conditions. Valinomycin plus potassium also inhibited their phototactic response; however, valinomycin or potassium alone had no effect. A change in membrane potential of the cells was measured as an absorbance change of carotenoid. Changes in the membrane potential caused by "on-off" light were prevented by antimycin and by valinomycin plus potassium, but not by antimycin plus phenazine methosulfate nor valinomycin or potassium alone. The results indicated that the phototactic response of R. rubrum is mediated by a sudden change in electron flow in the photosynthetic electron transfer system, and that the membrane potential plays an important role in manifestation of the response.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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