scholarly journals Dual Role of the Plastid Terminal Oxidase in Tomato

2007 ◽  
Vol 145 (3) ◽  
pp. 691-702 ◽  
Author(s):  
Maryam Shahbazi ◽  
Matthias Gilbert ◽  
Anne-Marie Labouré ◽  
Marcel Kuntz
Keyword(s):  
Dual Role ◽  
Terminal Oxidase ◽  
Plastid Terminal Oxidase

scholarly journals Overexpression of plastid terminal oxidase in Synechocystis sp. PCC 6803 alters cellular redox state

2017 ◽  
Vol 372 (1730) ◽  
pp. 20160379 ◽  
Author(s):  
Kathleen Feilke ◽  
Ghada Ajlani ◽  
Anja Krieger-Liszkay
Keyword(s):  
Higher Plants ◽  
Photosynthetic Apparatus ◽  
Oxygenic Photosynthesis ◽  
Terminal Oxidase ◽  
Cellular Redox ◽  
Excess Electrons ◽  
Plastid Terminal Oxidase ◽  
Absorption Measurements ◽  
Pcc 6803

Cyanobacteria are the most ancient organisms performing oxygenic photosynthesis, and they are the ancestors of plant plastids. All plastids contain the plastid terminal oxidase (PTOX), while only certain cyanobacteria contain PTOX. Many putative functions have been discussed for PTOX in higher plants including a photoprotective role during abiotic stresses like high light, salinity and extreme temperatures. Since PTOX oxidizes PQH 2 and reduces oxygen to water, it is thought to protect against photo-oxidative damage by removing excess electrons from the plastoquinone (PQ) pool. To investigate the role of PTOX we overexpressed rice PTOX fused to the maltose-binding protein (MBP-OsPTOX) in Synechocystis sp. PCC 6803, a model cyanobacterium that does not encode PTOX. The fusion was highly expressed and OsPTOX was active, as shown by chlorophyll fluorescence and P 700 absorption measurements. The presence of PTOX led to a highly oxidized state of the NAD(P)H/NAD(P) + pool, as detected by NAD(P)H fluorescence. Moreover, in the PTOX overexpressor the electron transport capacity of PSI relative to PSII was higher, indicating an alteration of the photosystem I (PSI) to photosystem II (PSII) stoichiometry. We suggest that PTOX controls the expression of responsive genes of the photosynthetic apparatus in a different way from the PQ/PQH 2 ratio. This article is part of the themed issue ‘Enhancing photosynthesis in crop plants: targets for improvement’.

Dual role of B7 costimulation in obesity-related non-alcoholic steatohepatitis (NASH) and metabolic dysregulation

2014 ◽  
Vol 122 (03) ◽  
Author(s):  
A Chatzigeorgiou ◽  
R Garcia-Martin ◽  
KJ Chung ◽  
I Alexaki ◽  
A Klotzsche-von Ameln ◽  
...  
Keyword(s):  
Dual Role ◽  
Alcoholic Steatohepatitis ◽  
Metabolic Dysregulation

A dual role of the N-terminal FQQI motif in GLUT4 trafficking

2008 ◽  
Vol 3 (S 1) ◽  
Author(s):  
U Bernhardt ◽  
HG Joost ◽  
H Al-Hasani
Keyword(s):  
Dual Role

Dual Role of RKIP in NF-kB Signaling Pathways

2011 ◽  
Vol 2 (1) ◽  
pp. 21-34
Author(s):  
Huihui Tang ◽  
Sungdae Park ◽  
Kam C. Yeung
Keyword(s):  
Signaling Pathways ◽  
Dual Role
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