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  • Title: Bacteriorhodopsin, boundary lipid and protein conformers: a spin label study.
    Author: Hoffmann W, Clark AD, Turner M, Wyard S, Chapman D.
    Journal: Biochim Biophys Acta; 1980 May 08; 598(1):178-83. PubMed ID: 7417426.
    Abstract:
    A spin label study, as a function of temperature, has been made with the bacteriorhodopsin membrane using a stearic acid spin label. The ESR spectra show a strong variation with temperature and the presence of isosbestic points. The spectra are interpreted as indicating the presence of a two-component system with an activation energy (approx. 14 kcal/mol) corresponding to a protein conformational change. This activation energy is similar to that deduced from recent flash photolysis studies. It is concluded that the spin label is sensitive to the temperature-dependent protein conformational change in this membrane system.
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