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- W1489754650 abstract "Monomeric and trimeric PS I complexes missing the three stromal subunits E,C and D (termed PS I core complexes) were prepared from the thermophilic cyanobacterium Synechococcus sp. by incubation with urea. The subunits E,C and D are sequentially removed. In the monomeric PS I the subunit C is removed with a half life of approx. 5 min. This is about eight times faster than in the trimeric PS I complex. In parallel with the removal of the F AB containing subunit C the reduction kinetics of P700 + changed from a half life of about 25 ms to about 750 μs. The partner of P700 + in the 750 μs charge recombination was identified to be F X by the difference spectrum of this phase. There are some minor differences in the spectra of trimeric and monomeric PS I core complexes. At 77K the forward electron transfer from A − 1 to F X is blocked in the major fraction of the PS I core complexes and P700 + A − 1 recombines with a half life of about 220 μs. In the remaining fraction P700 + F X − is formed and decays with a half life of approx. 10 ms at 77 K. The kinetics of the forward electron transfer from A − 1 to the iron‐sulfur‐clusters was measured in the native PS I and the corresponding core complexes. The reoxidation kinetics of A − 1 are identical in both cases ( t 12 = 180 ns). We conclude that Fx is an obligatory intermediate in the normal forward electron transfer." @default.
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- W1489754650 date "1994-01-31" @default.
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- W1489754650 title "Spectroscopic characterization of PS I core complexes from thermophilic <i>Synechococcus</i> sp" @default.
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- W1489754650 doi "https://doi.org/10.1016/0014-5793(94)80364-1" @default.
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