Catalyzes the Claisen rearrangement of chorismate to prephenate. Probably involved in the aromatic amino acid biosynthesis. chorismate = prephenate The formation of the complex with AroG activates the chorismate mutase activity. Metabolic intermediate biosynthesis; prephenate biosynthesis; prephenate from chorismate: step 1/1. Homodimer (By similarity). Probably interacts with AroG (MSMEG_4244) (PubMed:17965159). Truncated N-terminus. Truncated N-terminus.