Abstract
Electric light scattering measurements were carried out with the aim of studying the electric properties of apomembranes, sodium-borohydride-treated-apomembranes and reconstituted membranes. Considerable differences were observed in the behaviour of native purple membranes and both apomembranes and reconstituted membranes. The electric polarizability and the transverse charge asymmetry (permanent dipole moment) decrease rapidly in the following order: native purple membrane, apomembrane, all- trans and 4-keto reconstituted membrane preparations. An increase in the size of the fragments takes place after the bleaching procedure, and this parameter is not altered after the reconstitution of apomembranes with retinal analogues. Data show that the removal of the retinal chromophore is associated with strong changes in the surface electric properties of the membrane fragments. In contrast, reconstitution of apomembrane with synthetic retinals (all- trans and 4-keto), which leads to a regeneration of the spectroscopic properties, does not lead to a recovery of the electric properties.
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