期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 358, 期 1, 页码 83-96出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2006.01.085
关键词
AFM; native membrane; membrane architecture; light harvesting; core complex
The structural analysis of the individual components of the photosynthetic apparatus of Rhodopseudomonas palustris, or those of related species, is almost complete. To shed light on the assembly and organization of this machinery, we have studied native membranes of Rps. palustris grown under different light conditions using atomic force microscopy (AFM). The organization of the complexes in the membranes is different from any previously observed: with areas of crystalline core-complexes, crystalline antennae, mixed domains, and apparently pure lipid membranes devoid of protein. Examination of antennae structure shows that chromatic adaptation is associated with modifications in absorption and size of the peripheral light harvesting complexes (LH2) as light intensity is reduced. The core-complex is observed to contain a reaction centre (RC) surrounded by an elliptical assembly of 1.5 LH1 subunits and a gap attributed to the W-subunit. The localization of the W-subunit is not restricted to the periapsis of the core-complex but randomly located with respect to the RC imposed axis. (c) 2006 Elsevier Ltd. All rights reserved.
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