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|a 10.1111/j.1529-8817.2011.01092.x
|2 doi
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|a eng
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|a Ryan-Keogh, Thomas J
|e verfasserin
|4 aut
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|a THE CYANOBACTERIAL CHLOROPHYLL-BINDING-PROTEIN ISIA ACTS TO INCREASE THE IN VIVO EFFECTIVE ABSORPTION CROSS-SECTION OF PSI UNDER IRON LIMITATION(1)
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|c 2012
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|a Text
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|a ƒaComputermedien
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|a Date Completed 25.03.2016
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|a Date Revised 24.03.2016
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2011 Phycological Society of America.
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|a Iron availability limits primary production in >30% of the world's oceans; hence phytoplankton have developed acclimation strategies. In particular, cyanobacteria express IsiA (iron-stress-induced) under iron stress, which can become the most abundant chl-binding protein in the cell. Within iron-limited oceanic regions with significant cyanobacterial biomass, IsiA may represent a significant fraction of the total chl. We spectroscopically measured the effective cross-section of the photosynthetic reaction center PSI (σPSI ) in vivo and biochemically quantified the absolute abundance of PSI, PSII, and IsiA in the model cyanobacterium Synechocystis sp. PCC 6803. We demonstrate that accumulation of IsiA results in a ∼60% increase in σPSI , in agreement with the theoretical increase in cross-section based on the structure of the biochemically isolated IsiA-PSI supercomplex from cyanobacteria. Deriving a chl budget, we suggest that IsiA plays a primary role as a light-harvesting antenna for PSI. On progressive iron-stress in culture, IsiA continues to accumulate without a concomitant increase in σPSI , suggesting that there may be a secondary role for IsiA. In natural populations, the potential physiological significance of the uncoupled pool of IsiA remains to be established. However, the functional role as a PSI antenna suggests that a large fraction of IsiA-bound chl is directly involved in photosynthetic electron transport
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|a Journal Article
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|a IsiA
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|a PSI
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|a chlorophyll-binding protein
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|a cyanobacteria
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|a iron limitation
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|a Macey, Anna I
|e verfasserin
|4 aut
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|a Cockshutt, Amanda M
|e verfasserin
|4 aut
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|a Moore, C Mark
|e verfasserin
|4 aut
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|a Bibby, Thomas S
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of phycology
|d 1966
|g 48(2012), 1 vom: 24. Feb., Seite 145-54
|w (DE-627)NLM098182994
|x 1529-8817
|7 nnas
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|g volume:48
|g year:2012
|g number:1
|g day:24
|g month:02
|g pages:145-54
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