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Journal Article

A Unifying Concept for Ion Translocation by Retinal Proteins

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Oesterhelt,  Dieter
Oesterhelt, Dieter / Membrane Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

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Tittor,  Jörg
Oesterhelt, Dieter / Membrane Biochemistry, Max Planck Institute of Biochemistry, Max Planck Society;

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Bamberg,  Ernst
Transport Proteins Group, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Oesterhelt, D., Tittor, J., & Bamberg, E. (1992). A Unifying Concept for Ion Translocation by Retinal Proteins. Journal of Bioenergetics and Biomembranes, 24(2), 181-191. doi:10.1007/BF00762676.


Cite as: http://hdl.handle.net/21.11116/0000-0007-9924-4
Abstract
First, halorhodopsin is capable of pumping protons after illumination with greenand blue light in the same direction as chloride. Second, mutated bacteriorhodopsin where the proton acceptor Asp85 and the proton donor Asp96 are replaced by Asn showed proton pump activity after illumination with blue light in the same direction as wildtype after green light illumination. These results can be explained by and are discussed in light of our new hypothesis: structural changes in either molecule lead to a change in ion affinity and accessibility for determining the vectoriality of the transport through the two proteins.