chorismate = prephenate No allosteric regulation. kcat is 38.7 sec(-1) with chorismate as substrate (at pH 8). Metabolic intermediate biosynthesis; prephenate biosynthesis; prephenate from chorismate: step 1/1. Homodimer. Expressed in roots, stems, cauline leaves and flowers, and at lower levels in rosette leaves and siliques. Transiently down-regulated by wounding. Not induced by bacterial elicitor or bacterial and fungal pathogens.