Symmetry matters for the electronic structure of core complexes from Rhodopseudomonas palustris and Rhodobacter sphaeroides PufX

Richter, M.F., Baier, J., Prem, T., Oellerich, S., Francia, F., Venturoli, G., Oesterhelt, D., Southall, J., Cogdell, R. and Köhler, J. (2007) Symmetry matters for the electronic structure of core complexes from Rhodopseudomonas palustris and Rhodobacter sphaeroides PufX. Proceedings of the National Academy of Sciences of the United States of America, 104(16), pp. 6661-6665. (doi:10.1073/pnas.0611115104)

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Abstract

Low-temperature (1.4 K), single-molecule fluorescence-excitation spectra have been recorded for individual reaction center–light-harvesting 1 complexes from <i>Rhodopseudomonas</i> <i>palustris</i> and the PufX<sup>−</sup> strain of <i>Rhodobacter</i> <i>sphaeroides</i>. More than 80% of the complexes from <i>Rb</i>. <i>sphaeroides</i> show only broad absorption bands, whereas nearly all of the complexes from <i>Rps</i>. <i>palustris</i> also have a narrow line at the low-energy end of their spectrum. We describe how the presence of this narrow feature indicates the presence of a gap in the electronic structure of the light-harvesting 1 complex from <i>Rps</i>. <i>palustris</i>, which provides strong support for the physical gap that was previously modeled in its x-ray crystal structure.

Item Type:Articles
Keywords:bacterial photosynthesis, light-harvesting complex, single-molecule spectroscopy
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard
Authors: Richter, M.F., Baier, J., Prem, T., Oellerich, S., Francia, F., Venturoli, G., Oesterhelt, D., Southall, J., Cogdell, R., and Köhler, J.
Subjects:Q Science > QR Microbiology
College/School:College of Medical Veterinary and Life Sciences
College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Proceedings of the National Academy of Sciences of the United States of America
Publisher:National Academy of Sciences
ISSN:0027-8424
ISSN (Online):1091-6490
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