The light reactions of photosynthesis are known to comprise both linear and cyclic electron flow in order to convert light energy into chemical energy in the form of NADPH and ATP. Antimycin A (AA) has been proposed as an inhibitor of ferredoxin-dependent cyclic electron flow around photosystem I (CEF-PSI) in photosynthesis research. However, its precise inhibitory mechanism and target site had not been elucidated yet. Here we show that AA inhibits the cyclic (alternative) elec- tron flow via cytochrome b (Cyt b ) within photosystem II (CEF-PSII). When AA was applied to thylakoid membranes 559 559 isolated from spinach leaves, the high potential form of Cyt b , which was reduced in the dark, was transformed into the lower potential forms and readily oxidized by molecular oxygen. In the absence of AA, the reduced Cyt b was oxidized by P680 upon light illumination and re-reduced in the dark, mainly by the electron from the Q site on the acceptor side of PSII. In contrast, AA suppressed the oxidation of Cyt b and induced its reduction under the illumination. This inhibition of Cyt b oxidation by AA enhanced photoinhibition of PSII. Based on the above results, we propose caution regarding
Photosynthesis Research – Springer Journals
Published: May 22, 2018
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