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We identified a spontaneously generated mutant from Synechocystis sp. PCC6803 wild-type cells grown in BG-11 agar plates containing 5 mM Glu and 10 μM DCMU. This mutant carries an R7L mutation on the α-subunit of cyt b559 in photosystem II (PSII). In the recent 2.9 Å PSII crystal structural model, the side chain of this arginine residue is in close contact with the heme propionates of cyt b559. We...
Cytochrome (cyt) b559 has been proposed to play an important role in the cyclic electron flow processes that protect photosystem II (PSII) from light-induced damage during photoinhibitory conditions. However, the exact role(s) of cyt b559 in the cyclic electron transfer pathway(s) in PSII remains unclear. To study the exact role(s) of cyt b559, we have constructed a series of site-directed mutants,...
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