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2 results on '"Aerobic cyclase"'

1. NADPH-dependent thioredoxin reductase and 2-Cys peroxiredoxins are needed for the protection of Mg–protoporphyrin monomethyl ester cyclase

Author

Stenbaek, Anne, Hansson, Andreas, Wulff, Ragna Peterson, Hansson, Mats, Dietz, Karl-Josef, and Jensen, Poul Erik

Subjects
*ARABIDOPSIS thaliana, *CHLOROPLASTS, *THIOREDOXIN, *PORPHYRINS, *ESTERS, *HYDROGEN peroxide, *CHLOROPHYLL synthesis
Abstract

Abstract: 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. [Copyright &y& Elsevier]

Published
2008
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2. NADPH-dependent thioredoxin reductase and 2-Cys peroxiredoxins are needed for the protection of Mg–protoporphyrin monomethyl ester cyclase

Author

Karl-Josef Dietz, Ragna Peterson Wulff, Anne Stenbaek, Mats Hansson, Andreas Hansson, and Poul Erik Jensen

Subjects
Chlorophyll, Thioredoxin-Disulfide Reductase, Arabidopsis thaliana, Thioredoxin reductase, Arabidopsis, Biophysics, Biology, Biochemistry, Cyclase, chemistry.chemical_compound, Protochlorophyllide, Biosynthesis, Structural Biology, Genetics, Hydrogen peroxide, gene, Molecular Biology, Hydrogen peroxide scavenging, chemistry.chemical_classification, Reactive oxygen species, Arabidopsis Proteins, Peroxiredoxins, Cell Biology, biochemical phenomena, metabolism, and nutrition, Chloroplast biogenesis, Aerobiosis, co-expression, Chloroplast, Aerobic cyclase, Biosynthetic pathway, chemistry, Oxygenases, bacteria, Gene co-expression, Peroxiredoxin
Abstract

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. (c) 2008 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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