The Expression Pattern of NAD(P)H Oxidases and the Cyclic Electron Transport Pathway around Photosystem I ofSynechocystissp. PCC6803 Depend on Growth Conditions

2008 ◽  
Vol 72 (12) ◽  
pp. 3180-3188 ◽  
Author(s):  
Junko OOYABU ◽  
Masako OHTSUKA ◽  
Yasuhiro KASHINO ◽  
Hiroyuki KOIKE ◽  
Kazuhiko SATOH
Keyword(s):  
Electron Transport ◽  
Expression Pattern ◽  
Photosystem I ◽  
Growth Conditions ◽  
Cyclic Electron Transport ◽  
Transport Pathway ◽  
Electron Transport Pathway

scholarly journals Inactivation of ycf33 Results in an Altered Cyclic Electron Transport Pathway Around Photosystem I in Synechocystis sp. PCC6803

2004 ◽  
Vol 45 (9) ◽  
pp. 1243-1251 ◽  
Author(s):  
Masako Ohtsuka ◽  
Junko Oyabu ◽  
Yasuhiro Kashino ◽  
Kazuhiko Satoh ◽  
Hiroyuki Koike
Keyword(s):  
Electron Transport ◽  
Photosystem I ◽  
Cyclic Electron Transport ◽  
Transport Pathway ◽  
Electron Transport Pathway ◽  
Synechocystis Sp

scholarly journals The Physiological Functionality of PGR5/PGRL1-Dependent Cyclic Electron Transport in Sustaining Photosynthesis

2021 ◽  
Vol 12 ◽  
Author(s):  
Mingzhu Ma ◽  
Yifei Liu ◽  
Chunming Bai ◽  
Yunhong Yang ◽  
Zhiyu Sun ◽  
...  
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Nadh Dehydrogenase ◽  
Extreme Weather Events ◽  
Cyclic Electron Transport ◽  
Linear Electron ◽  
Transport Pathway ◽  
Biochemical Processes ◽  
Weather Events ◽  
Electron Transport Pathway

The cyclic electron transport (CET), after the linear electron transport (LET), is another important electron transport pathway during the light reactions of photosynthesis. The proton gradient regulation 5 (PGR5)/PRG5-like photosynthetic phenotype 1 (PGRL1) and the NADH dehydrogenase-like complex pathways are linked to the CET. Recently, the regulation of CET around photosystem I (PSI) has been recognized as crucial for photosynthesis and plant growth. Here, we summarized the main biochemical processes of the PGR5/PGRL1-dependent CET pathway and its physiological significance in protecting the photosystem II and PSI, ATP/NADPH ratio maintenance, and regulating the transitions between LET and CET in order to optimize photosynthesis when encountering unfavorable conditions. A better understanding of the PGR5/PGRL1-mediated CET during photosynthesis might provide novel strategies for improving crop yield in a world facing more extreme weather events with multiple stresses affecting the plants.

scholarly journals Functional redundancy and crosstalk between flavodiiron proteins and NDH-1 in Synechocystis sp. PCC 6803

2019 ◽  
Author(s):  
Lauri Nikkanen ◽  
Anita Santana Sánchez ◽  
Maria Ermakova ◽  
Matthias Rögner ◽  
Laurent Cournac ◽  
...  
Keyword(s):  
Electron Transport ◽  
Light Availability ◽  
Photosynthetic Apparatus ◽  
Growth Conditions ◽  
Functional Redundancy ◽  
High Light ◽  
Transport Pathway ◽  
Photosynthetic Organisms ◽  
Electron Transport Pathway ◽  
Pcc 6803

ABSTRACTIn oxygenic photosynthetic organisms excluding angiosperms, flavodiiron proteins (FDPs) catalyze light-dependent reduction of O2 to H2O. This alleviates electron pressure on the photosynthetic apparatus and protects it from photodamage. In Synechocystis sp. PCC 6803, four FDP isoforms function as hetero-oligomers of Flv1 and Flv3 and/or Flv2 and Flv4. An alternative electron transport pathway mediated by the NAD(P)H dehydrogenase-like complex (NDH-1) also contributes to redox hemostasis and the photoprotection of photosynthesis. Four NDH-1 types haven been characterized in cyanobacteria: NDH-11 and NDH-12, which function in respiration; and NDH-13 and NDH-14, which function in CO2 uptake. All four types are involved in cyclic electron transport. Along with single FDP mutants (Δflv1 and Δflv3) and the double NDH-1 mutants (Δd1d2, which is deficient in NDH-11,2 and Δd3d4, which is deficient in NDH-13,4), we studied triple mutants lacking either one of Flv1 or Flv3, and NDH-11,2 or NDH-13,4. We show that the presence of either Flv1/3 or NDH-11,2, but not NDH-13,4, is indispensable for survival during changes in growth conditions from high CO2 /moderate light to low CO2 / high light. Our results suggest functional redundancy and crosstalk between FDPs and NDH-11,2 under the studied conditions, and demonstrate that the functions of FDPs and NDH-11,2 are dynamically coordinated for the efficient oxidation of PSI and for photoprotection under variable CO2 and light availability.One sentence summaryFlavodiiron proteins and NDH-1 complex ensure survival of cyanobacterial cells by cooperatively safeguarding the photosynthetic apparatus against excessive reduction

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