Requires Mn2+ or Mg2+ for activity. Unlike EC 1.1.1.41, isocitrate dehydrogenase (NAD+), oxalosuccinate can be used as a substrate. In eukaryotes, isocitrate dehydrogenase exists in two forms: an NAD+-linked enzyme found only in mitochondria and displaying allosteric properties, and a non-allosteric, NADP+-linked enzyme that is found in both mitochondria and cytoplasm . The enzyme from some species can also use NAD+ but much more slowly [6,7].
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SYSTEMATIC NAME
IUBMB Comments
isocitrate:NADP+ oxidoreductase (decarboxylating)
Requires Mn2+ or Mg2+ for activity. Unlike EC 1.1.1.41, isocitrate dehydrogenase (NAD+), oxalosuccinate can be used as a substrate. In eukaryotes, isocitrate dehydrogenase exists in two forms: an NAD+-linked enzyme found only in mitochondria and displaying allosteric properties, and a non-allosteric, NADP+-linked enzyme that is found in both mitochondria and cytoplasm [6]. The enzyme from some species can also use NAD+ but much more slowly [6,7].
Arabidopsis thaliana has three NADP-ICDH genes At1g65930, At5g14590, and At1g54340, coding for the proteins NP_176768, NP_196963, and BT025983, respectively, that are located in different subcellular compartments, i.e. cytosol, chloroplasts, mitochondria, and peroxisomes
cICDH is involved in amino acid synthesis, and plays a role in redox signalling linked to pathogen responses, but cICDH is not required for plant development and primary metabolism in optimal growth conditions
the mutation does not perturb the enzymatic characteristics of the enzyme. However, the mutant is less affected by nitrosoglutathione treatment than the wild type enzyme
introduction of an icdh mutation into the cat2 background, in which increased availability of H2O2 causes perturbed redox homeostasis and induction of stress-related genes. Accumulation of oxidized glutathione and pathogen-related responses are enhanced in double cat2 icdh mutants compared to cat2. Single icdh mutants present constitutive induction of PR genes, enhanced resistance to bacteria in icdh, cat2 and cat2 icdh is quantitatively correlated with PR gene expression. However, the effect of icdh in both Col0 and cat2 backgrounds is not associated with enhanced accumulation of salicylic acid, phenotypes, overview
identification of naturally occurring peroxisomal NADP-ICDH (picdh) Arabidopsis mutant lines, designated as picdh-1 (SALK_072422) and picdh-2 (SALK_039193C) carrying a T-DNA insertion in exons 9 and in the 5'UTR, respectively. The mutation results in a lack of the peroxisomal NADP-ICDH in both picdh-1 and picdh-2 plants. There are no significant differences in phenotype between the wild-type (Wt) and the two mutant (picdh-1 and picdh-2) lines. Intrinsic photosynthetic performance is not altered in the different plants with similar maximum C assimilation capacities, light use efficiency, and respiration rates in darkness due to similar growth rates. No differences are found in growth rates, stomatal densities, or leaf mass-area ratios
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OXIDATION STABILITY
ORGANISM
UNIPROT
LITERATURE
enzyme activity is affected by oxidative agents like oxidized glutathione and nitrosoglutathione through modifications of conserved Cys residues in the protein