May play a role in chloroplast biogenesis. chorismate = prephenate Allosterically inhibited by tyrosine and phenylalanine. Activated by tryptophan. Metabolic intermediate biosynthesis; prephenate biosynthesis; prephenate from chorismate: step 1/1. Homodimer (PubMed:21976020). Interacts with Cmu1 of the fungal pathogen Ustilago maydis (PubMed:21976020).