Aspartic acid-96 is the internal proton donor in the reprotonation of the Schiff base of bacteriorhodopsin.

@article{Otto1989AsparticAI,
  title={Aspartic acid-96 is the internal proton donor in the reprotonation of the Schiff base of bacteriorhodopsin.},
  author={Harald Otto and Thomas Marti and M. Holz and Tatsushi Mogi and Manfred Lindau and Har Gobind Khorana and Maarten P. Heyn},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1989},
  volume={86 23},
  pages={9228-32}
}
Above pH 8 the decay of the photocycle intermediate M of bacteriorhodopsin splits into two components: the usual millisecond pH-independent component and an additional slower component with a rate constant proportional to the molar concentration of H+, [H+]. In parallel, the charge translocation signal associated with the reprotonation of the Schiff base… CONTINUE READING