Para-Nitroacetophenoxime N-Methylcarbamate, A New Electron-Acceptor In Isolated Thylakoids
PLANT SCIENCE(1985)
Abstract
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.
MoreTranslated text
Key words
N-methylcarbamate of p-nitroacetophenoxime,chloroplasts,electron transfer,methylviologen,thylakoids,spinach
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined