Dark adaptation and spectral changes in Triton-X-100-treated bacteriorhodopsin

I. Kovács, K. Hollós-Nagy, G. Váró

Research output: Contribution to journalArticle

8 Citations (Scopus)


The influence of solubilization on the dark adaptation kinetics and spectral changes associated with the light- to dark-adapted transition of monomeric bacteriorhodopsin was studied and compared with that of the purple membrane. The kinetics of dark adaptation were described with a two-state model. An analysis of the temperature dependence of the rate constants yielded the activation enthalpy and entropy of the transition. The results show that solubilization affects the energetics of the light to dark transition. A decrease in the activation entropy results in a significantly smaller dark adaptation rate in the monomeric form. The blue shift of the visible band associated with the ligh to dark transition of monomeric bacteriorhodopsin depends on the temperatyre, which can be explained by the temperature dependence of the absorbance.

Original languageEnglish
Pages (from-to)21-25
Number of pages5
JournalJournal of Photochemistry and Photobiology, B: Biology
Issue number1
Publication statusPublished - Jan 1995


  • Bacteriorhodopsin
  • Dark adaptation
  • Purple membrane
  • Solubilization

ASJC Scopus subject areas

  • Radiation
  • Radiological and Ultrasound Technology
  • Biophysics
  • Radiology Nuclear Medicine and imaging

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