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The membrane-associated CpcG2-phycobilisome in Synechocystis: a new photosystem I antenna


, : The membrane-associated CpcG2-phycobilisome in Synechocystis: a new photosystem I antenna. Plant Physiology 144(2): 1200-1210

The phycobilisome (PBS) is a supramolecular antenna complex required for photosynthesis in cyanobacteria and bilin-containing red algae. While the basic architecture of PBS is widely conserved, the phycobiliproteins, core structure and linker polypeptides, show significant diversity across different species. By contrast, we recently reported that the unicellular cyanobacterium Synechocystis sp. PCC 6803 possesses two types of PBSs that differ in their interconnecting "rod-core linker" proteins (CpcG1 and CpcG2). CpcG1-PBS was found to be equivalent to conventional PBS, whereas CpcG2-PBS retains phycocyanin rods but is devoid of the central core. This study describes the functional analysis of CpcG1-PBS and CpcG2-PBS. Specific energy transfer from PBS to photosystems that was estimated for cells and thylakoid membranes based on low-temperature fluorescence showed that CpcG2-PBS transfers light energy preferentially to photosystem I (PSI) compared to CpcG1-PBS, although they are able to transfer to both photosystems. The preferential energy transfer was also supported by the increased photosystem stoichiometry (PSI/PSII) in the cpcG2 disruptant. The cpcG2 disruptant consistently showed retarded growth under weak PSII light, in which excitation of PSI is limited. Isolation of thylakoid membranes with high salt showed that CpcG2-PBS is tightly associated with the membrane, while CpcG1-PBS is partly released. CpcG2 is characterized by its C-terminal hydrophobic segment, which may anchor CpcG2-PBS to the thylakoid membrane or PSI complex. Further sequence analysis revealed that CpcG2-like proteins containing a C-terminal hydrophobic segment are widely distributed in many cyanobacteria.

US$19.90

PMID: 17468217

DOI: 10.1104/pp.107.099267


Other references

Wallman J., 1986: Is reading a form of visual deprivation for retinal neurons can it lead to myopia. Society for Neuroscience Abstracts 12(1): 637

Litwin, M.S.; Shpall, A.I.; Dorey, F., 1997: Patient satisfaction with short stays for radical prostatectomy. Objectives. We evaluated the effects on patient satisfaction of shortened postoperative hospital stays after radical retropubic prostatectomy (RRP). Methods. A previously validated, self-administered instrument was used to assess satisfaction with...

Milano, A.; Bortolotti, U.; Talenti, E.; Valfrè, C.; Arbustini, E.; Valente, M.; Mazzucco, A.; Gallucci, V.; Thiene, G., 1984: Calcific degeneration as the main cause of porcine bioprosthetic valve failure. Sixty-seven glutaraldehyde-processed porcine bioprostheses (PBs), recovered at autopsy or reoperation from 65 patients, were evaluated by roentgenologic and pathologic examination. Seven patients with 8 PBs were younger than 20 years of age. The t...

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Fessler, L., 1962: The biological character of psychoanalysis. Experimental Medicine and Surgery 20: 36-40

Sivoronov A.A.; Bobrov A.B.; Malyuk B.I., 1985: Morphological types of early Precambrian greenstone structures in the central Dnieper region (Ukrainian Shield). Geotectonics 18(5): 387-397

Greaves, J.; Rennison, B.; Redfern, R., 1976: Resistance of the ship rat, Rattus rattus L. to warfarin. Wild-caught Rattus rattus from 38 populations from Merseyside and 3 other ports in England were tested for resistance. Animals were fed in the laboratory for 28 days on a bait containing 0·025% warfarin. The survival of 49·7% of 694 animals indi...

Kuo, Y.J.; Shanbour, L.L., 1979: Chloride, sodium, potassium and hydrogen ion transport in isolated canine gastric mucosa. 1. The fluxes of isotopically labelled Na+, Cl- and K+ in each direction and H+ secretion across isolated dog gastric mucosa were measured under short-circuit conditions. 2. In the non-stimulated state, the net flux of Na+ was 6.61 micronequiv/cm2...

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Karg, K.; Schmelz, M.; Call, J.; Tomasello, M., 2016: Differing views: Can chimpanzees do Level 2 perspective-taking?. Although chimpanzees understand what others may see, it is unclear whether they understand how others see things (Level 2 perspective-taking). We investigated whether chimpanzees can predict the behavior of a conspecific which is holding a mistake...