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Potato (Solanum tuberosum L.) tubers contain two isoenzymes of 3-deoxy-d-arabino-heptulosonate 7-phosphate synthase (EC 4.1.2.15), the enzyme that catalyzes the first step of aromatic amino acid biosynthesis. One of the isoenzymes is specifically activated by Mn(2+), and the other requires Co(2+), Mg(2+), or another divalent cation for activity. Monospecific polyclonal antibodies against the Mn(2+)-activated isoenzyme do not cross-react with the other isoenzyme. Wounding of potato tubers induces the Mn(2+)-activated form but not the other. We conclude that two different genes encode two different isoenzymes that catalyze the first step in the shikimate pathway.

Wounding Induces One of Two Isoenzymes of 3-Deoxy-d-arabino-Heptulosonate 7-Phosphate Synthase in Solanum tuberosum L.