Istituto di Biofisica     
Barsanti L., Petrosino V., Walne P. L., Gualtieri P. The photoreceptor protein of Euglena gracilis. In: Febs Letters, vol. 482 (3) pp. 247 - 251. Elsevier, 2000.
We isolated the photoactive protein Erh, isolated from the photoreceptor of the unicellular photosynthetic flagellate Euglena gracilis. It is a 27 kDa protein term with a photocycle resembling that of sensory rhodopsin, but with at least one stable intermediate. We recorded the absorption spectrum of the parent form of this protein both under native form and in the presence of hydroxylamine and sodium borohydride, and the fluorescence spectra of both the parent and intermediate forms. We suggest that Erh is a rhodopsin-like protein and propose a simple photocycle. This proteinterm shows optical bistability, without thermal deactivation.
DOI: 10.1016/S0014-5793(00)02062-7
Subject Rhodopsin-like protein
Optical bistability
Euglena gracilis

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