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• W2044389610 abstract "The aim of this work was to examine the extent to which the oxidative steps of the pentose phosphate pathway in the cytosol contribute to the provision of reductant for biosynthetic reactions. Maize (Zea mays L.) contains at least two loci (pgd1 and pgd2) that encode 6-phosphogluconate dehydrogenase. Ten genotypic combinations of wild-type (Pgd1+3.8;Pgd2+5) and null alleles of pgd1 and pgd2 were constructed in the B73 background. The maximum catalytic activity of 6-phosphogluconate dehydrogenase in the roots of seedlings of these lines correlated with the number of functional pgd1 and pgd2 alleles. Enzyme activity in the double-null homozygote (pgd1-null;pgd2-null) was 32% of that in B73 wild-type suggesting the presence of at least one other isozyme of 6-phosphogluconate dehydrogenase in maize. Subcellular fractionation studies and latency measurements confirmed that the products of pgd1 and pgd2 are responsible for the vast majority, if not all, of the cytosolic 6-phosphogluconate dehydrogenase activity in maize roots. Essentially, all of the residual activity in the double-null homozygote was confined to the plastids. Low concentrations (0.1–0.5 mM) of sodium nitrite stimulated 14CO2 production by detached root tips of both wild-type and 6-phosphogluconate dehydrogenase-deficient maize seedlings fed [U-14C]glucose. Analysis of the ratio of 14CO2 released from [1–14C]glucose relative to [6–14C]glucose (C1/C6 ratio) showed that stimulation of the oxidative pentose phosphate pathway by nitrite correlated with the dosage of wild-type alleles of pgd1 and pgd2. The failure of 6-phosphogluconate dehydrogenase-deficient lines to respond to nitrite indicates that perturbation of the cytosolic oxidative pentose phosphate pathway can influence the provision of reductant in the plastid. We conclude that the plastidic and cytosolic oxidative pentose phosphate pathways are able to co-operate in the provision of NADPH for biosynthesis." @default.
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• W2044389610 date "1998-05-01" @default.
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• W2044389610 title "Co-operation between cytosolic and plastidic oxidative pentose phosphate pathways revealed by 6-phosphogluconate dehydrogenase-deficient genotypes of maize" @default.
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• W2044389610 doi "https://doi.org/10.1046/j.1365-313x.1998.00143.x" @default.
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