Retinal Identification in Pelvetia fastigiata

Author： Robinson K.R.   Lorenzi R.   Ceccarelli N.   Gualtieri P.  

Publisher： Elsevier

ISSN： 0006-291X

Source： Biochemical and Biophysical Research Communications, Vol.243, Iss.3, 1998-02, pp. : 776-778

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Abstract

Unidirectional blue light directs the rhizoid-thallus axis in the apolar zygote of the brown alga Pelvetia fastigiata. This effect is mediated by an increase in the intracellular concentration of cGMP. Here, we show the extraction, purification and identification of 1 μg of all-trans retinal from 1.2 × 106 Pelvetia zygotes. The number of retinal molecules per cell was about 4∗109. Since retinal, wherever present, is exclusively associated with an opsin to form a light sensitive complex (rhodopsin-like proteins), and since the physiological response originated by this protein produces a variation of cGMP concentration, this new finding suggests that a rhodopsin-like protein could be the photoreceptor in this brown alga.

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