Structural Studies on Chlorosomes from Prosthecochloris Aestuarii
| Autor: | Wullink, W, van Bruggen, EFJ, GOODHEW, PJ, DICKINSON, HG |
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| Jazyk: | angličtina |
| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | Green Photosynthetic Bacteria, 415-416 STARTPAGE=415;ENDPAGE=416;TITLE=Green Photosynthetic Bacteria Green Photosynthetic Bacteria ISBN: 9781461282969 |
| Popis: | In 1964 an electron microscope study of thin sections of several strains of green bacteria belonging to the genus Chlorobium revealed that these organisms always contained vesicle-like elements connected with the cytoplasmic membrane. Upon fractionation these elements turned out to be associated with a fraction that contained a very high specific chlorophyll content. These observations led to the assumption that these vesicles were the site of the photosynthetic apparatus of green bacteria Ctohen-Bazire, 1964). In 1980 a structural model of these vesicles, then called chlorosomes, in Chlorobium limicola was proposed, based on freeze-fracture studies (Staehelm et al., 1980). In this study evidence was presented for the occurrence of a crystalline baseplate consisting of BChl a-protein between the BChl c-protein in the chlorosome core and the reaction centres in the cytoplasmic membrane. The observation that the chlorosome contains some BChl a-protein, not identical to that present in the baseplate CBerola and Olson, 1966), ted to a slightly modified model (Fig. 1). The baseplate BChl a-protein from the related bacterium, Prosthecochloris aestuarii, has been crystallized and its structure determined by X-ray techniques at 0.19-nm resolution (Fenna et al., 1974; Tronrud et al., T9S6). |
| Databáze: | OpenAIRE |
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