Abstract
The Photosystem II protein CP-47 has been hypothesized to be involved in binding the reaction center chlorophyll. The psbB gene, encoding this protein, was cloned from the genome of the cyanobacterium Synechocystis 6803, and sequenced. The DNA sequence is 68% homologous with that of the psbB gene from spinach, whereas the predicted amino acid sequence is 76% homologous. The hydropathy patterns of Synechocystis and spinach CP-47 are almost indistinguishable, indicating the same general CP-47 folding pattern in the thylakoid membrane in the two species. There are five pairs of histidine residues in CP-47 that are spaced by 13 or 14 amino acids and that are located in hydrophobic regions of the protein; these histidine residues may be involved in chlorophyll binding. Interruption of the psbB gene by a DNA fragment carrying a gene conferring kanamycin resistance results in a loss of Photosystem II activity. This indicates that an intact CP-47 is required for a functional Photosystem II complex, but does not necessarily indicate that this protein would house the reaction center.
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Vermaas, W.F.J., Williams, J.G.K. & Arntzen, C.J. Sequencing and modification of psbB, the gene encoding the CP-47 protein of Photosystem II, in the cyanobacterium Synechocystis 6803. Plant Mol Biol 8, 317–326 (1987). https://doi.org/10.1007/BF00021311
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DOI: https://doi.org/10.1007/BF00021311