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Comparison of the Two Retinal Proteins Bacteriorhodopsin and Halorhodopsin

  • Jörg Tittor
  • Peter Hegemann
  • Dieter Oesterhelt

Abstract

Two retinal proteins act as light-driven pumps in halobacteria. Bacteriorhodopsin (BR) translocates protons to the medium and halorhodopsin (HR) transports chloride into the cytoplasma. Bacteriorhodopsin’s functional and structural properties are well known. Transport is mediated by a photochemical cycle of the retinal chromophore accompanied by trans to cis isomerization and a reversible deprotonation of its Schiff base. Spectroscopy in combination with the use of retinal analogue compounds demonstrated that the trans to cis isomerization is connected to the primary photochemical reaction (1).

Keywords

Schiff Base Retinal Protein Black Lipid Membrane Retinal Chromophore Halobacterium Halobium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Jörg Tittor
    • 1
  • Peter Hegemann
    • 1
  • Dieter Oesterhelt
    • 1
  1. 1.Max-Planck-Institut für BiochemieMartinsriedGermany

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