Istituto di Biofisica     
Robinson K. R., Lorenzi R., Ceccarelli N., Gualtieri P. Retinal Identification in Pelvetia fastigiata. In: Biochemical and Biophysical Research Communications, vol. 243 (3) pp. 776 - 778. Elsevier, 1998.
Unidirectional blue light directs the rhizoid-thallus axis in the apolar zygote of the brown algaPelvetia 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-transretinal from 1.2 106Pelvetiazygotes. 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.
DOI: 10.1006/bbrc.1998.8176
Subject Photoreception
Pelvetia fastigiata

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