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.
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.
Original language | English |
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Pages (from-to) | 2773-2778 |
Journal | FEBS Letters |
Volume | 582 |
Issue number | 18 |
DOIs | |
Publication status | Published - 2008 |
Subject classification (UKÄ)
- Biological Sciences
Free keywords
- Gene co-expression
- Chloroplast biogenesis
- Biosynthetic pathway
- Hydrogen peroxide scavenging
- Arabidopsis thaliana
- Aerobic cyclase