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Photosynthesis light-harvesting complexes

Despite considerable efforts very few membrane proteins have yielded crystals that diffract x-rays to high resolution. In fact, only about a dozen such proteins are currently known, among which are porins (which are outer membrane proteins from bacteria), the enzymes cytochrome c oxidase and prostaglandin synthase, and the light-harvesting complexes and photosynthetic reaction centers involved in photosynthesis. In contrast, many other membrane proteins have yielded small crystals that diffract poorly, or not at all, using conventional x-ray sources. However, using the most advanced synchrotron sources (see Chapter 18) it is now possible to determine x-ray structures from protein crystals as small as 20 pm wide which will permit more membrane protein structures to be elucidated. [Pg.224]

Horton, P. and Ruban, A.V. 1994. The role of light-harvesting complex II in energy quenching. In Photoinhibition of Photosynthesis, eds. N.R. Baker and J.R. Bowyer, pp. 11-128. Oxford BIOS Scientific Publishers Ltd. [Pg.134]

These reactions taking place in the RC are the primary chemical reactions of photosynthesis. (A detailed description ot these primary chemical reactions in RCs of purple bacteria is given in Chapter 3.) The primary physical processes of photosynthesis are light absorption and transfer of excitation energy. These processes take place mainly in the light-harvesting complexes (LHCs) described in Chapter 11. [Pg.22]

A.R. Grossman, D. Bhaya, K.E. Apt, and D M. Kehoe. 1995. Light-harvesting complexes in oxygenic photosynthesis Diversity, control, and evolution Annu. Rev. Genet. 29 231-288. (PubMed)... [Pg.825]

Thomber JP, Peter GF, Chitnis PR, Nechushtai R and Vainstein A. (1988). The light-harvesting complex of photosystem II of higher plants. In Stevens SE Jr, Bryant DA (eds), Light-energy Transduction in Photosynthesis Higher Plant and Bacterial Models, pp. 137-154 The American Society of Plant Physiologists, Rockville, Maryland. [Pg.130]

Light-Harvesting Complexes Increase the Efficiency of Photosynthesis... [Pg.335]

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