Abstract
5-Enolpyruvylshikimate 3-phosphate (EPSP) synthase (3-phosphoshikimate 1-carboxyvinyltransferase; EC 2.5.1.19), 3-dehydroquinate dehydratase (EC 4.2.1.10) and shikimate: NADP+ oxidoreductase (EC 1.1.1.25) were present in intact chloroplasts and root plastids isolated from pea seedling extracts by sucrose and modified-silica density gradient centrifugation. In young (approx. 10-d-old) seedling shoots the enzymes were predominantly chloroplastic; high-performance anion-exchange chromatography resolved minor isoenzymic activities not observed in density-gradientpurified chloroplasts. The initial enzyme of the shikimate pathway, 3-deoxy-d-arabino-heptulosonate 7-phosphate synthase (EC 4.1.2.15) was also associated with intact density-gradient-purified chloroplasts. 3-Dehydroquinate synthase (EC 4.6.1.3) and shikimate kinase (EC 2.7.1.71) were detected together with the other pathway enzymes in stromal preparations from washed chloroplasts. Plastidic EPSP synthase was inhibited by micromolar concentrations of the herbicide glyphosate.
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Abbreviations
- DAHP:
-
3-deoxy-d-arabino-heptulosonate 7-phosphate
- DEAE:
-
diethylaminoethyl
- DHQase:
-
3-dehydroquinate dehydratase
- DTT:
-
dithiothreitol
- EPSP:
-
5-enolpyruvylshikimate 3-phosphate
- SORase:
-
shikimate:NADP+ oxidoreductase
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Mousdale, D.M., Coggins, J.R. Subcellular localization of the common shikimate-pathway enzymes in Pisum sativum L.. Planta 163, 241–249 (1985). https://doi.org/10.1007/BF00393514
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DOI: https://doi.org/10.1007/BF00393514