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The role played by the residues Leu12 and Lys33 – which are both located at the north hydrophobic patch of plastocyanin – in the interaction of the copper protein with Photosystem I from the cyanobacterium Synechocystis sp. PCC 6803 has been investigated by site-directed mutagenesis. A thermodynamic analysis of PS I reduction by wild-type and mutant plastocyanins has been performed by laser-flash...
Wild-type plastocyanin from the cyanobacterium Synechocystis sp. PCC 6803 does not form any kinetically detectable transient complex with Photosystem I (PS I) during electron transfer, but the D44R/D47R double mutant of copper protein does [De la Cerda et al. (1997) Biochemistry 36: 10125–10130]. To identify the PS I component that is involved in the complex formation with the D44R/D47R plastocyanin,...
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