Abstract
A main difference in the photosynthetic apparatus in thylakoids of cyanobacteria and plants is the light-harvesting antenna. In plants, light-harvesting chlorophyll a/b-binding (LHC) proteins are the main component of the antenna (reviewed in [1]), whereas in cyanobacteria phycobilisomes constitute the peripheral antenna system (see [2] for a review). In cyanobacteria, all chlorophyll was thought to be associated with reaction center complexes. Indeed, most of the chlorophyll in cyanobacteria is associated with the photosystem I (PS I) reaction center, as upon deletion of the PS I complex in Synechocystis sp. PCC 6803 the amount of chlorophyll per cell is reduced to about 15% of the amount in wild type [3]. However, the concept of all chlorophyll to be associated with reaction centers was proven to be an oversimplification as upon genetic deletion of both PS I and photosystem II (PS II) in Synechocystis sp. PCC 6803 chlorophyll still remained in the organism in apparently protein-bound form [4]. The existence of additional chlorophyll-binding proteins was also suggested from the ratio of chlorophyll and PS II observed in PS I-less Synechocystis sp. PCC 6803 strains: this ratio is 100–110 [3], which is at least twice the number of chlorophylls present in isolated oxygen-evolving PS II core complexes [5,6].
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© 1999 Springer Science+Business Media Dordrecht
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Vermaas, W.F.J. (1999). Chlorophyll-Binding Proteins in Cyanobacteria. In: Argyroudi-Akoyunoglou, J.H., Senger, H. (eds) The Chloroplast: From Molecular Biology to Biotechnology. NATO Science Series, vol 64. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4788-0_41
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DOI: https://doi.org/10.1007/978-94-011-4788-0_41
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