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Novel NADP-linked isocitrate dehydrogenase present in peroxisomes of n-alkane-utilizing yeast, Candida tropicalis: comparison with mitochondrial NAD-linked isocitrate dehydrogenase

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Abstract

Peroxisomal NADP-linked isocitrate dehydrogenase (Ps-NADP-IDH) was purified for the first time from Candida tropicalis cells grown on n-alkane as a carbon source, which was effective in proliferation of peroxisomes. The properties of Ps-NADP-IDH were compared with those of mitochondrial NAD-linked isocitrate dehydrogenase (Mt-NAD-IDH) purified from the cells grown on acetate, in which peroxisomes did not proliferate. Ps-NADP-IDH was a homodimer of identical subunits (45 kDa), while Mt-NAD-IDH was suggested to be a heterooctamer composed of two types of subunits with different molecular masses (41 and 38 kDa). Kinetic studies revealed that Ps-NADP-IDH gave Michaelis-Menten saturation curves against isocitrate and NADP concentrations, whereas Mt-NAD-IDH was an allosteric enzyme regulated by ATP, AMP, and citrate. Inhibition by 2-oxoglutarate, a precursor of glutamate, was observed only for Ps-NADP-IDH. Both enzymes were inhibited by concomitant addition of oxalacetate and glyoxylate. The function of Ps-NADP-IDH seems to be completely discriminated from that of Mt-NAD-IDH as reflected by their distinct subcellular localizations. Furthermore, the properties of Ps-NADP-IDH were also compared with those of other mitochondrial and cytosolic IDHs from sources reported previously.

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Yamamoto, S., Atomi, H., Ueda, M. et al. Novel NADP-linked isocitrate dehydrogenase present in peroxisomes of n-alkane-utilizing yeast, Candida tropicalis: comparison with mitochondrial NAD-linked isocitrate dehydrogenase. Arch. Microbiol. 163, 104–111 (1995). https://doi.org/10.1007/BF00381783

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  • DOI: https://doi.org/10.1007/BF00381783

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