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• W2034887334 abstract "Regulation of NAD- and NADP-dependent isocitrate dehydrogenases (NAD-ICDH, EC 1.1.1.41, and NADP-ICDH, EC 1.1.1.42) by the level of reduced and oxidized pyridine nucleotides has been investigated in pea (Pisum sativum L.) leaves. The affinities of mitochondrial and cytosolic ICDH enzymes to substrates and inhibitors were determined on partially purified preparations in forward and reverse directions. From the kinetic data, it follows that NADP(+)- and NAD(+)-dependent isocitrate dehydrogenases in mitochondria represent a system strongly responding to the intramitochondrial NADPH and NADH levels. The NADPH, NADP(+), NADH and NAD(+) concentrations were determined by subcellular fractionation of pea leaf protoplasts using membrane filtration in mitochondria and cytosol in darkness and in the light under saturating and limiting CO(2) conditions. The cytosolic NADPH/NADP ratio was about 1 and almost constant both in darkness and in the light. In mitochondria, the NADPH/NADP ratio was low in darkness (0.2) and increased in the light, reaching 3 in limiting CO(2) conditions compared to 1 in saturating CO(2). At high reduction levels of NADP and NAD observed at limiting CO(2) in the light, i.e. when photorespiratory glycine is the main mitochondrial substrate, isocitrate oxidation in mitochondria will be suppressed and citrate will be transported to the cytosol ('citrate valve'), where the cytosolic NADP-ICDH supplies 2-oxoglutarate for the photorespiratory ammonia refixation." @default.
• W2034887334 created "2016-06-24" @default.
• W2034887334 creator A5012989382 @default.
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• W2034887334 date "2003-09-01" @default.
• W2034887334 modified "2023-10-14" @default.
• W2034887334 title "Regulation of NAD- and NADP-dependent isocitrate dehydrogenases by reduction levels of pyridine nucleotides in mitochondria and cytosol of pea leaves" @default.
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• W2034887334 doi "https://doi.org/10.1016/s0005-2728(03)00106-3" @default.
• W2034887334 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14507432" @default.
• W2034887334 hasPublicationYear "2003" @default.
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