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The reaction centre of the photounit of; Rhodospirillum rubrum; is anchored to the light-harvesting complex with four-fold rotational disorder

Stahlberg, H. and Dubochet, J. and Vogel, H. and Ghosh, R.. (1998) The reaction centre of the photounit of; Rhodospirillum rubrum; is anchored to the light-harvesting complex with four-fold rotational disorder. Photosynthesis Research, 55 (2-3). pp. 363-368.

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Abstract

The minimal photounit of the photosynthetic membranes of the purple non-sulphur bacterium Rhodospirillum rubrum, comprising the reaction centre and the light-harvesting complex has been purified and crystallised in two dimensions in the presence of added phospholipids, and subsequently visualised by electron microscopy after negatively-staining. The position of the reaction centres within the light-harvesting ring has been determined at low resolution by the application of a new analysis for rotationally disordered identical units (here the reaction centres) within a two-dimensional crystalline lattice comprised of perfectly aligned unit cells (here the light-harvesting complexes). The reaction centre was found to preferentially occupy one of four orientations within the light-harvesting complex. The light-harvesting complex appears to be distorted to C4 symmetry, thus assuming a squarish shape when visualised by negative staining. A tentative structural model of the reaction centre-light-harvesting complex photounit which fits the experimental data is proposed.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Structural Biology & Biophysics > Structural Biology (Stahlberg)
UniBasel Contributors:Stahlberg, Henning
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer
ISSN:0166-8595
e-ISSN:1573-5079
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Nov 2017 10:56
Deposited On:22 Nov 2017 10:56

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