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NADPH-dependent thioredoxin reductase and 2-Cys peroxiredoxins are needed for the protection of Mg-protoporphyrin monomethyl ester cyclase.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
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2008 (English)In: FEBS Letters, ISSN 0014-5793, Vol. 582, no 18, 2773-8 p.Article in journal (Refereed) Published
Abstract [en]

The chloroplast-localized NADPH-dependent thioredoxin reductase (NTRC) has been found to be able to reduce hydrogen peroxide scavenging 2-Cys peroxiredoxins. We show that the Arabidopsis ntrc mutant is perturbed in chlorophyll biosynthesis and accumulate intermediates preceding protochlorophyllide formation. A specific involvement of NTRC during biosynthesis of protochlorophyllide is indicated from in vitro aerobic cyclase assays in which the conversion of Mg–protoporhyrin monomethyl ester into protochlorophyllide is stimulated by addition of the NTRC/2-Cys peroxiredoxin system. These findings support the hypothesis that this NADPH-dependent hydrogen peroxide scavenging system is particularly important during periods with limited reducing power from photosynthesis, e.g. under chloroplast biogenesis.

Place, publisher, year, edition, pages
2008. Vol. 582, no 18, 2773-8 p.
Keyword [en]
Aerobiosis, Arabidopsis/*enzymology/genetics, Chlorophyll/*biosynthesis/genetics, Oxygenases/*metabolism, Peroxiredoxins/*metabolism, Thioredoxin-Disulfide Reductase/genetics/*metabolism
URN: urn:nbn:se:umu:diva-10577DOI: 10.1016/j.febslet.2008.07.006PubMedID: 18625226OAI: diva2:150248
Available from: 2008-10-02 Created: 2008-10-02 Last updated: 2015-03-18Bibliographically approved

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