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The photocycle of Anabaena sensory rhodopsin (ASR), which is the photoreceptor for the cyanobacterial chromatic adaptation, was examined by focusing on the H+ transfer reactions. Photoinduced deprotonation of the Schiff base induces the formation of M intermediate. However, the M formation of ASR was accompanied with the H+ uptake from the medium. This indicates the contributions of two residues: a H+-accepting residue from the Schiff base and a H+-capturing residue from the medium. The mutation experiments suggested that these residues are assigned to Asp217 and Glu36, respectively, and their protonation states influence each other. We will discuss the relationship between the H+ transfer reactions and the conformational change of ASR.

seibutsu butsuri/seibutsu butsuri

2P241 Light-induced proton transfer reactions at the cytoplasmic half channel of Anabaena sensory rhodopsin(18A. Photobiology:Vision &amp; Photoreception,Poster)