Crystal structure of the RC-LH1 core complex from Rhodopseudomonas palustris |
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Authors: | Roszak Aleksander W Howard Tina D Southall June Gardiner Alastair T Law Christopher J Isaacs Neil W Cogdell Richard J |
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Affiliation: | Department of Chemistry, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK. |
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Abstract: | The crystal structure at 4.8 angstrom resolution of the reaction center-light harvesting 1 (RC-LH1) core complex from Rhodopseudomonas palustris shows the reaction center surrounded by an oval LH1 complex that consists of 15 pairs of transmembrane helical alpha- and beta-apoproteins and their coordinated bacteriochlorophylls. Complete closure of the RC by the LH1 is prevented by a single transmembrane helix, out of register with the array of inner LH1 alpha-apoproteins. This break, located next to the binding site in the reaction center for the secondary electron acceptor ubiquinone (UQB), may provide a portal through which UQB can transfer electrons to cytochrome b/c1. |
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