scholarly journals Chloroplast ATP Synthase Modulation of the Thylakoid Proton Motive Force: Implications for Photosystem I and Photosystem II Photoprotection

2017 ◽  
Vol 8 ◽  
Author(s):  
Atsuko Kanazawa ◽  
Elisabeth Ostendorf ◽  
Kaori Kohzuma ◽  
Donghee Hoh ◽  
Deserah D. Strand ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Atp Synthase ◽  
Photosystem I ◽  
Proton Motive Force ◽  
Motive Force ◽  
Chloroplast Atp Synthase

scholarly journals Chloroplastic ATP synthase builds up a proton motive force preventing production of reactive oxygen species in photosystem I

2017 ◽  
Vol 91 (2) ◽  
pp. 306-324 ◽  
Author(s):  
Daisuke Takagi ◽  
Katsumi Amako ◽  
Masaki Hashiguchi ◽  
Hidehiro Fukaki ◽  
Kimitsune Ishizaki ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Atp Synthase ◽  
Photosystem I ◽  
Reactive Oxygen ◽  
Proton Motive Force ◽  
Motive Force ◽  
Oxygen Species

scholarly journals The Activity of the ATP Synthase fromEscherichia coliIs Regulated by the Transmembrane Proton Motive Force

2000 ◽  
Vol 275 (39) ◽  
pp. 30157-30162 ◽  
Author(s):  
Susanne Fischer ◽  
Peter Gräber ◽  
Paola Turina
Keyword(s):  
Atp Synthase ◽  
Proton Motive Force ◽  
Motive Force

scholarly journals Is Myelin a Mitochondrion?

2012 ◽  
Vol 33 (1) ◽  
pp. 33-36 ◽  
Author(s):  
Julia J Harris ◽  
David Attwell
Keyword(s):  
Membrane Potential ◽  
Respiratory Chain ◽  
Atp Synthase ◽  
Proton Motive Force ◽  
Motive Force ◽  
Myelin Membrane ◽  
Considerable Doubt

It has been hypothesized that myelin acts like a mitochondrion, generating ATP across the membranes of its sheath. By calculating the proton motive force across the myelin membrane based on known values for the pH and membrane potential of the oligodendrocyte, we find that insufficient energy could be harvested from proton flow across the myelin membrane to synthesize ATP. In fact, if the respiratory chain were present in the myelin membrane, then the ATP synthase would function in reverse, hydrolyzing rather than synthesizing ATP. This calculation places the hypothesis of an energy-producing role for myelin in considerable doubt.

scholarly journals Limitations to photosynthesis by proton motive force-induced photosystem II photodamage

eLife ◽  
2016 ◽  
Vol 5 ◽  
Author(s):  
Geoffry A Davis ◽  
Atsuko Kanazawa ◽  
Mark Aurel Schöttler ◽  
Kaori Kohzuma ◽  
John E Froehlich ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Proton Motive Force ◽  
Motive Force ◽  
Limiting Factor ◽  
Wild Type ◽  
Recombination Rates ◽  
Atp Production ◽  
Photosynthetic Regulation ◽  
Light Capture

The thylakoid proton motive force (pmf) generated during photosynthesis is the essential driving force for ATP production; it is also a central regulator of light capture and electron transfer. We investigated the effects of elevated pmf on photosynthesis in a library of Arabidopsis thaliana mutants with altered rates of thylakoid lumen proton efflux, leading to a range of steady-state pmf extents. We observed the expected pmf-dependent alterations in photosynthetic regulation, but also strong effects on the rate of photosystem II (PSII) photodamage. Detailed analyses indicate this effect is related to an elevated electric field (Δψ) component of the pmf, rather than lumen acidification, which in vivo increased PSII charge recombination rates, producing singlet oxygen and subsequent photodamage. The effects are seen even in wild type plants, especially under fluctuating illumination, suggesting that Δψ-induced photodamage represents a previously unrecognized limiting factor for plant productivity under dynamic environmental conditions seen in the field.

scholarly journals Biased Brownian stepping rotation of FoF1-ATP synthase driven by proton motive force

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Rikiya Watanabe ◽  
Kazuhito V. Tabata ◽  
Ryota Iino ◽  
Hiroshi Ueno ◽  
Masayuki Iwamoto ◽  
...  
Keyword(s):  
Atp Synthase ◽  
Proton Motive Force ◽  
Motive Force ◽  
Fof1 Atp Synthase

scholarly journals Direct Observation of the Rotary Motion of FOF1-ATP Synthase Driven by Proton Motive Force

2013 ◽  
Vol 104 (2) ◽  
pp. 277a
Author(s):  
Rikiya Watanabe ◽  
Kazuhito V. Tabata ◽  
Ryota Iino ◽  
Hiroyuki Noji
Keyword(s):  
Atp Synthase ◽  
Direct Observation ◽  
Proton Motive Force ◽  
Motive Force ◽  
Rotary Motion ◽  
Fof1 Atp Synthase
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