The three proline residues (P25, P242, and P434) of Agrobacterium CP4 5-enolpyruvylshikimate-3-phosphate synthase are crucial for the enzyme activity - Kyungsu Kang; Yong-Mei Jin; Hyesung Jeon; Sang-Ryoung Park; Dae-geun Song; Joo Young Lee; Cheol-Ho Pan; Minkyun Kim (Plant Biotechnology Reports, 2010)