DAPA synthase is an enzyme involved in the synthesis of the plant hormone diaminopimelic acid (DAPA), belonging to the family of amino acid synthases. It is primarily located in plant chloroplasts. DAPA synthase catalyzes the synthesis of DAPA, which is an important plant signaling molecule involved in regulating plant growth, development, stress responses, and immune reactions. The DAPA synthase gene is expressed specifically in plants, and mutations in this gene may affect plant growth, development, and stress responses.