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A photosystem other than PS370 also mediates the negative phototaxis of Halobacterium halobium

Tetsuo Takahashi, Hiroaki Tomioka, Naoki Kamo, Yonosuke Kobatake
DOI: http://dx.doi.org/10.1111/j.1574-6968.1985.tb00784.x 161-164 First published online: 1 June 1985


It was found that a photorepellent system other than photosystem 370 (PS370) also controls the behavior of Halobacterium halobium. Both the dependence of background illumination and wavelength where the response showed maximum action distinguished that photosystem from PS370 whose photoreceptor pigment is thought to be an intermediate of s-rhodopsin (sR). A mutant strain that has no detectable activity in PS370 and in photoattractant response was isolated. This mutant strain showed the repellent response due to the new photosystem.

  • Retinal
  • s-rhodopsin
  • archaebacteria
  • taxis

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