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The temperature dependence of the biphasic electron transfer (ET) from the secondary acceptor A1 (phylloquinone) to iron-sulfur cluster F X was investigated by flash absorption spectroscopy in photosystem I (PS I) isolated from Synechocystis sp. PCC 6803. While the slower phase (τ=340 ns at 295 K) slowed upon cooling according to an activation energy of 110 meV, the time constant of the faster...
Photosystem I (PS I) mediates light-induced electron transfer from P700 through a chlorophyll a, a quinone and a [4Fe–4S] iron–sulfur cluster F X , located on the core subunits PsaA/B to iron–sulfur clusters F A/B on subunit PsaC. Structure function relations in the native and in the mutant (psaB-C565S/D566E) of the cysteine ligand of F X cluster were studied by X-ray absorption...
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