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DOI: 10.1055/s-2007-965433
Georg Thieme Verlag Stuttgart KG · New York
Significance of Plant Sulfite Oxidase
Publication History
Received: July 28, 2006
Accepted: April 23, 2007
Publication Date:
13 September 2007 (online)
Abstract
Sulfite oxidizing activities are known since years in animals, microorganisms, and also plants. Among plants, the only enzyme well characterized on molecular and biochemical level is the molybdoenzyme sulfite oxidase (SO). It oxidizes sulfite using molecular oxygen as electron acceptor, leading to the production of sulfate and hydrogen peroxide. The latter reaction product seems to be the reason why plant SO is localized in peroxisomes, because peroxisomal catalase is able to decompose hydrogen peroxide. On the other hand, we have indications for an additional reaction taking place in peroxisomes: sulfite can be nonenzymatically oxidized by hydrogen peroxide. This will promote the detoxification of hydrogen peroxide especially in the case of high amounts of sulfite. Hence we assume that SO could possibly serve as “safety valve” for detoxifying excess amounts of sulfite and protecting the cell from sulfitolysis. Supportive evidence for this assumption comes from experiments where we fumigated transgenic poplar plants overexpressing Arabidopsis SO with SO2 gas. In this paper, we try to explain sulfite oxidation in its co-regulation with sulfate assimilation and summarize other sulfite oxidizing activities described in plants. Finally we discuss the importance of sulfite detoxification in plants.
Key words
Molybdoenzyme - hydrogen peroxide - sulfite oxidase - sulfitolysis - SO2
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R. Hänsch
Department of Plant Biology
Technical University of Braunschweig
Humboldtstraße 1
38106 Braunschweig
Germany
Email: r.haensch@tu-bs.de
Guest Editor: T. Rausch