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  • Title: Light-dependent trans to cis isomerization of the retinal in halorhodopsin.
    Author: Lanyi JK.
    Journal: FEBS Lett; 1984 Oct 01; 175(2):337-42. PubMed ID: 6479349.
    Abstract:
    Flash-induced absorption changes in the near UV were determined for bacteriorhodopsin and halorhodopsin on a millisecond time scale. The difference spectrum obtained for bacteriorhodopsin was comparable to model difference spectra of tyrosine (aromatic OH deprotonated vs protonated), as found by others. The flash-induced difference spectrum for halorhodopsin, in contrast, resembled a model spectrum obtained for trans to 13-cis isomerization of retinal in bacteriorhodopsin. A model for chloride translocation by halorhodopsin is presented, in which the retinal isomerization moves positive charges, which in turn modulate the affinity of a site to chloride.
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