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  • Title: Phospholipid chain immobilization and steroid rotational immobilization in acetylcholine receptor-rich membranes from Torpedo marmorata.
    Author: Marsh D, Watts A, Barrantes FJ.
    Journal: Biochim Biophys Acta; 1981 Jul 06; 645(1):97-101. PubMed ID: 6266478.
    Abstract:
    1. The ESR spectra of both phosphatidylcholine and phosphatidylethanolamine spin labels reveal an immobilized lipid component (tau R greater than or equal to 50 ns), in addition to a fluid component (tau R approximately 1 ns), in acetylcholine receptor-rich membranes prepared from Torpedo marmorata electroplax according to the method of Cohen et al. (Cohen, J.B., Weber, M., Huchet, M. and Changeux, J.-P. (1972) FEBS Lett. 26, 43--27). 2. The ESR spectra of the androstanol spin label display a component corresponding to molecules which are immobilized with respect to rotation about the long molecular axis (tau R greater than or equal to 50 ns), in addition to the fluid lipid bilayer component in which the molecules are rotating rapidly about their long axes (tau R approximately 1 ns). This immobilized component is observed throughout the temperature range 2--22 degrees C, at an approximately constant relative intensity of approx. 45% of the total, which is quantitatively the same as previously observed with fatty acid spin labels.
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