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• W1985169063 abstract "The spectroscopic properties of the light-harvesting 2 complexes (LH2) from the purple bacterium Rhodopseudomonas acidophila (strain 10050) in detergent micelles and reconstituted into lipid membranes have been studied by single-molecule spectroscopy. When LH2 complexes are solubilized from their host biological membranes by nondenaturing detergents, such as LDAO, there is a small 2-nm spectral shift of the B850 absorption band in the ensemble spectrum. This is reversed when the LH2 complexes are put back into phospholipid vesicles, i.e., into a more native-like environment. The spectroscopic properties on the single-molecule level of the detergent-solubilized LH2 complexes were compared with those reconstituted into the lipid membranes to see if their detailed spectroscopic behavior was influenced by these small changes in the position of the B850 absorption band. A detailed analysis of the low-temperature single-molecule fluorescence-excitation spectra of the LH2 complexes in these two different conditions showed no significant differences. In particular, the distribution of the spectral splitting between the circular k = +/-1 exciton states of the B850 absorption band and the distribution of the mutual angle between the k = +/-1 exciton states are identical in both cases. It can be concluded, therefore, that the LH2 complexes from Rps. acidophila are equally stable when solubilized in detergent micelles as they are when membrane reconstituted. Moreover, when they are solubilized in a suitable detergent and spin coated onto a surface for the single-molecule experiments they do not display any more structural disorder than when in a phospholipid membrane." @default.
• W1985169063 created "2016-06-24" @default.
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• W1985169063 date "2007-07-01" @default.
• W1985169063 modified "2023-09-29" @default.
• W1985169063 title "Single-Molecule Spectroscopic Characterization of Light-Harvesting 2 Complexes Reconstituted into Model Membranes" @default.
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• W1985169063 doi "https://doi.org/10.1529/biophysj.106.103606" @default.
• W1985169063 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1914413" @default.
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• W1985169063 hasPublicationYear "2007" @default.
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