Stimulation of Oxygen Evolution in Photosystem II by Copper(II) Ions

Author:

Burda Kvetoslava12,Kruk Jerzy3,Strzalka Kazimierz3,Schmid Georg H.2

Affiliation:

1. The Henryk Niewodniczañski Institute of Nuclear Physics, ul. Radzikowskiego 152, 31-342 Kraków, Poland

2. Fakultät für Biologie, Lehrstuhl Zellphysiologie, Universität Bielefeld, D-33501 Bielefeld, Germany

3. Department of Plant Physiology and Biochemistry, The Jan Zurzycki Institute of Molecular Biology, Jagiellonian University, Al. Mickiewicza 3, 31-120 Kraków, Poland

Abstract

We have found that Copper(II) ions at about equimolar Cu2+/photosystem II (PS II) reaction center proportions stimulate oxygen evolution nearly twofold. This high affinity Cubinding site is different from the binding sites of Mn and Ca ions. The analysis of the Cu2+ content in PS II preparations isolated from wild-type tobacco and a tobacco mutant deficient in light-harvesting complex suggests that Cu2+ may be a native component of PS II and may take part in the oxygen evolution process. At higher concentrations, Cu2+ ions inhibit oxygen evolution and quench fluorescence.

Publisher

Walter de Gruyter GmbH

Subject

General Biochemistry, Genetics and Molecular Biology

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