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p-Nitroacetophenoxime N-methylcarbamate, a new election acceptor in isolated thylakoids.

Tissut, Michel and Merlina, Georges and Genies, Eugène and Calmon, Jean-Pierre p-Nitroacetophenoxime N-methylcarbamate, a new election acceptor in isolated thylakoids. (1985) Plant Science, 38 (3). 155-161. ISSN 0168-9452

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Official URL: http://dx.doi.org/10.1016/0168-9452(85)90033-0


p-Nitroacetophenoxime N-methylcarbamate (MCPNA) is a rather potent inhibitor of the electron transfer in spinach class A chloroplasts. In isolated thylakoids, MCPNA is an electron acceptor at the level of photosystem I (PS I). It inhibits O2 evolution in the presence of NADP and ferredoxin but not the reduction of ferricyanide. MCPNA is active as an acceptor between 3 μM and 100 μM. At concentrations higher than 300 μM, inhibition of photosystem II (PS II) occurs. MCPNA has no uncoupling effect on photophosphorylation. Reduction of MCPNA by thylakoids in the presence of light is in accordance with the E′o of this compound (⩾−0.57 V) and is followed by an electron transfer to O2. This reaction probably explains the inhibitory effect of MCPNA on class A chloroplasts.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science/article/pii/0168945285900330
HAL Id:hal-03487148
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Other partners > Université Joseph Fourier Grenoble 1 - UJF (FRANCE)
Laboratory name:
Deposited On:18 Jul 2012 09:50

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