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The redox potentials of the b-type cytochromes of higher plant chloroplasts.

Rich, PR; Bendall, DS; (1980) The redox potentials of the b-type cytochromes of higher plant chloroplasts. Biochim Biophys Acta , 591 (1) pp. 153-161. 10.1016/0005-2728(80)90229-7.

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Abstract

1. In fresh chloroplasts,three b-type cytochromes exist. These are b-559HP (lambda max, 559 nm; Em at pH 7, +370 mV; pH-independent Em), b-559LP (lambda max, 559 nm; Em at pH 7, +20 mV; pH-independent Em) and b-563 (lambda max, 563 nm; Em at pH 7, -110 mV; pH-independent Em), b-559HP may be converted to a lower potential form (lambda max, 559 nm; Em at pH 7, +110 mV; pH-independent Em). 2. In catalytically active b-f particle preparations, three cytochromes exist. These are cytochrome f (lambda max, 554 nm; Em at pH 7, +375 mV, pK on oxidised cytochrome at pH 9), b-563 (lambda max, 563 nm; Em at pH 7, -90 mV, small pH-dependence of Em) and a b-559 species (lambda max, 559 nm, Em at pH 7, +85 mV; pH-independent Em). 3. A positive method of demonstration and estimation of b-559LP in fresh chloroplasts is described which involves the use of menadiol as a selective reductant of b-559LP.

Type: Article
Title: The redox potentials of the b-type cytochromes of higher plant chloroplasts.
Location: Netherlands
DOI: 10.1016/0005-2728(80)90229-7
Keywords: Chloroplasts, Cytochrome b Group, Cytochromes, Hydrogen-Ion Concentration, Kinetics, Oxidation-Reduction, Oxygen, Plants, Potentiometry, Spectrophotometry
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
URI: http://discovery.ucl.ac.uk/id/eprint/10026617
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