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- W2010732661 abstract "Cytochrome f and plastocyanin from the cyanobacterium Phormidium laminosum react an order of magnitude faster than their counterparts from chloroplasts when long-range electrostatic interactions have been screened out by high salt concentration [Schlarb-Ridley, B. G., et al. (2002) Biochemistry 41, 3279-3285]. To investigate the relative contributions of the reaction partners to these differences, the reactions of turnip cytochrome f with P. laminosum plastocyanin and P. laminosum cytochrome f with pea plastocyanin were examined. Exchanging one of the plant reaction partners with the corresponding cyanobacterial protein nearly abolished electron transfer at low ionic strength but increased the rate at high ionic strength. This increase was larger for P. laminosum cytochrome f than for P. laminosumplastocyanin. To identify molecular features of P. laminosum cytochrome f that contribute to the increase, the effect of mutations in the N-terminal heme-shielding peptide on the reaction with P. laminosum plastocyanin was determined. Phenylalanine-3 was converted to valine and tryptophan-4 to phenylalanine or leucine. The mutations lowered the rate constant at 0.1 M ionic strength by factors of 0.71 for F4V, 0.42 for W4F, and 0.63 for W4L while introducing little change in the shape of the ionic strength dependence curve. When the N-terminal tetrapeptide (sequence YPFW) was converted into that found in the chloroplast of Chlamydomonas reinhardtii (YPVF), the reaction was slowed further (factor of 0.26). The N-terminal heme-shielding peptide was found to be responsible for 75% of the kinetic differences between cytochrome f from chloroplasts and the cyanobacterium when electrostatic interactions were eliminated." @default.
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- W2010732661 date "2003-03-21" @default.
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- W2010732661 title "Relation between Interface Properties and Kinetics of Electron Transfer in the Interaction of Cytochrome <i>f</i> and Plastocyanin from Plants and the Cyanobacterium <i>Phormidium laminosum</i>" @default.
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- W2010732661 doi "https://doi.org/10.1021/bi020675+" @default.
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