scholarly journals Different Regulatory Modes of Synechocystis sp. PCC 6803 in Response to Photosynthesis Inhibitory Conditions

mSystems ◽  
2021 ◽  
Author(s):  
Sang-Hyeok Cho ◽  
Yujin Jeong ◽  
Seong-Joo Hong ◽  
Hookeun Lee ◽  
Hyung-Kyoon Choi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Environmental Conditions ◽  
High Light ◽  
Temperature Stresses ◽  
Production Platform ◽  
Biochemical Production ◽  
Synechocystis Sp ◽  
Pcc 6803

Cyanobacteria are a compelling biochemical production platform for their ability to propagate using light and atmospheric CO 2 via photosynthesis. However, the engineering of strains is hampered by limited understanding of photosynthesis under diverse environmental conditions such as high-light and low-temperature stresses.

scholarly journals Photorespiratory 2-phosphoglycolate metabolism and photoreduction of O2 cooperate in high-light acclimation of Synechocystis sp. strain PCC 6803

Planta ◽  
2009 ◽  
Vol 230 (4) ◽  
pp. 625-637 ◽  
Author(s):  
Claudia Hackenberg ◽  
Annerose Engelhardt ◽  
Hans C. P. Matthijs ◽  
Floyd Wittink ◽  
Hermann Bauwe ◽  
...  
Keyword(s):  
High Light ◽  
Light Acclimation ◽  
Synechocystis Sp ◽  
Pcc 6803

scholarly journals RpaA Regulates the Accumulation of Monomeric Photosystem I and PsbA under High Light Conditions in Synechocystis sp. PCC 6803

PLoS ONE ◽  
2012 ◽  
Vol 7 (9) ◽  
pp. e45139 ◽  
Author(s):  
Waqar Majeed ◽  
Yan Zhang ◽  
Yong Xue ◽  
Saurabh Ranade ◽  
Ryan Nastashia Blue ◽  
...  
Keyword(s):  
Photosystem I ◽  
High Light ◽  
Light Conditions ◽  
Synechocystis Sp ◽  
Pcc 6803

scholarly journals Slr0320 is Crucial for Optimal Function of Photosystem II during High Light Acclimation in Synechocystis sp. PCC 6803

Life ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 279
Author(s):  
Hao Zhang ◽  
Haitao Ge ◽  
Ye Zhang ◽  
Yingchun Wang ◽  
Pengpeng Zhang
Keyword(s):  
Electron Transfer ◽  
Chlorophyll Fluorescence ◽  
Photosystem Ii ◽  
Expression Profiles ◽  
Net Photosynthesis ◽  
High Light ◽  
Psii Activity ◽  
Optimal Function ◽  
Synechocystis Sp ◽  
Pcc 6803

Upon exposure of photosynthetic organisms to high light (HL), several HL acclimation responses are triggered. Herein, we identified a novel gene, slr0320, critical for HL acclimation in Synechocystis sp. PCC 6803. The growth rate of the Δslr0320 mutant was similar to wild type (WT) under normal light (NL) but severely declined under HL. Net photosynthesis of the mutant was lower under HL, but maximum photosystem II (PSII) activity was higher under NL and HL. Immunodetection revealed the accumulation and assembly of PSII were similar between WT and the mutant. Chlorophyll fluorescence traces showed the stable fluorescence of the mutant under light was much higher. Kinetics of single flash‐induced chlorophyll fluorescence increase and decay revealed the slower electron transfer from QA to QB in the mutant. These data indicate that, in the Δslr0320 mutant, the number of functional PSIIs was comparable to WT even under HL but the electron transfer between QA and QB was inefficient. Quantitative proteomics and real‐time PCR revealed that expression profiles of psbL, psbH and psbI were significantly altered in the Δslr0320 mutant. Thus, Slr0320 protein plays critical roles in optimizing PSII activity during HL acclimation and is essential for PSII electron transfer from QA to QB.

Perception and transduction of low-temperature signals to induce desaturation of fatty acids

2000 ◽  
Vol 28 (6) ◽  
pp. 628-630 ◽  
Author(s):  
I. Suzuki ◽  
D. A. Los ◽  
N. Murata
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Low Temperature ◽  
Membrane Lipids ◽  
Response Regulator ◽  
Random Mutagenesis ◽  
Fatty Acid Desaturases ◽  
Histidine Kinases ◽  
Synechocystis Sp ◽  
Pcc 6803

When cells of the cyanobacterium Synechocystis sp. PCC 6803 are exposed to a low temperature, genes for fatty acid desaturases are expressed with resultant increases in the degree of unsaturation of fatty acids in membrane lipids. However, the sensor and transducers of low-temperature signals had not yet been identified. In order to identify these components we applied to the cyanobacterium Synechocystis sp. PCC 6803 the systematic disruption of all 43 putative genes for histidine kinases and random mutagenesis of the whole genome in conjunction with screening by the transcriptional activity of the promoter of the desB gene for the ω 3 desaturase. This allowed us to identify two histidine kinases and a response regulator as components of the perception and transduction of low-temperature signals for the expression of genes for fatty acid desaturases.

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