Jan 18, 1974

The action of tetraphenylboron as a system II electron donor and its effect on the decay of the electrical field across the thylakoid membrane

Biochimica Et Biophysica Acta
K Erixon, G Renger


The effect of tetraphenylboron on the O2 evolution, the electron transport in normal and in Tris-washed chloroplasts, and on the decay of the electrical field across the thylakoid membrane has been investigated in spinach chloroplasts. It was found that: (1) The average O2 yield per flash as a function of the tetraphenylboron concentration is dependent on the number of excitation flashes. With increasing flash number, the tetraphenylboron concentration which is required for 50% suppression of the average O2 yield per flash shifts toward higher values. (2) After the irreversible consumption of tetraphenylboron by System II oxidizing equivalents, the O2 evolution reappears. (3) The electron flow from System II to System I, as indicated by the amplitude of the reduction kinetics of the 703 nm absorption change, remains unaffected in the tetraphenylboron concentration range and at flash numbers where the O2 evolution is totally suppressed. (4) Tetraphenylboron restores electron transport in Tris-washed chloroplasts. This tetraphenylboron-mediated electron transport is completely blocked by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU). (5) Preliminary titration experiments favor the assumption that tetraphenylboron acts in chlorop...Continue Reading

  • References15
  • Citations4


  • References15
  • Citations4


Mentioned in this Paper

Spinach preparation
Thylakoid Membrane
Uncoupling Agents
Spinacia oleracea
Electron Transport

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