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• W2036367144 abstract "It has previously been shown ( Henderson & Unwin, 1975 ) that the pigment molecules of the purple membrane of Halobacterium halobium are arranged in clusters of three within a two-dimensional crystal having P 3 symmetry. We have shown that an exciton interaction exists between the retinal chromophores of these pigment molecules which causes a splitting of the three degenerate energy levels of the individual chromophores in a cluster into two new levels separated by an energy 3 V g,e . A theoretical analysis of the consequences of this exciton interaction leads to three equations relating three measurable absorption and circular dichroism spectral properties to the three co-ordinates giving the relative orientations in space of the chromophores. These three quantities are the splitting, V g,e , the relative absorption intensities of the exciton bands, D + / D − , and the rotational strengths of the exciton bands, R ± . These quantities can be obtained from the optical properties of interacting (trimer) and non-interacting (monomer) chromophores. The degree of the chromophore interaction can be controlled by varying the percentage of the chromophore binding sites of the membrane occupied by the retinals. Accurate absorption and circular dichroic spectra of these samples were obtained, eliminating or minimizing a number of potential artifacts. An analysis of the data shows that the transition moments of the three chromophores of a cluster all lie approximately 19° out of the plane of the membrane, are pointed almost exactly toward the symmetry axis, and are very close together, about 15center-to-center. We have also deduced an energy level diagram of the chromophores with and without exciton interaction." @default.
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• W2036367144 date "1977-05-01" @default.
• W2036367144 modified "2023-10-18" @default.
• W2036367144 title "Exciton interactions and chromophore orientation in the purple membrane" @default.
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• W2036367144 doi "https://doi.org/10.1016/s0022-2836(77)80188-5" @default.
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