Article
The Schiff base counterion of bacteriorhodopsin is protonated in sensory rhodopsin I: spectroscopic and functional characterization of the mutated proteins D76N and D76A.
Biochemistry - 10 May 1994
Rath P, Olson K D, Spudich J L, Rothschild K J
Abstract excerpt
Both sensory rhodopsin I (SR-I), a phototaxis receptor, and bacteriorhodopsin (BR), a light-driven proton pump, share residues which have been identified as critical for BR functioning. This includes Asp76, which in the case of bacteriorhodopsin (Asp85) functions both as the Schiff base counterion and proton acceptor. We found that substituting an Asn for Asp76 (D76N) in SR-I has no effect on its visible...
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