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- W2019419909 abstract "In this work we studied putative ornithine decarboxylase activity (ODC, EC 4.1.1.17) in leaves of Arabidopsis thaliana L. (ecotype Columbia) plants at non-flowering stage (about 21 d of culture). Putative ODC activity was higher in the particulate than in the soluble fraction and activity was pH-dependent, increasing linearly with the pH. Inclusion of 10 mM arginine in the assay showed that the incidence of ornithine transcarbamoylase activity (EC 2.1.3.3) accounted for about 35% in the particulate fraction, but that its contribution was negligible in the soluble fraction. Increasing concentrations of the irreversible inhibitor α-difluoromethylornithine (DFMO) progressively inhibited putative ODC activity with a 40% inhibition at 20 mM DFMO. Taking into consideration the incidence of ornithine transcarbamoylase activity, the total inhibition of putative ODC activity was of about 75%. Fractionation experiments permitted measurement of putative ODC activity in the nuclei- and chloroplast-enriched fractions. The assays performed on membranes and stromal fractions isolated from gradient purified chloroplasts showed that the enzyme activity was associated almost totally with the plastid membranes." @default.
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- W2019419909 date "2003-10-01" @default.
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- W2019419909 title "Putative ornithine decarboxylase activity in Arabidopsis thaliana: inhibition and intracellular localisation" @default.
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