The enzyme from the plants maize and Arabidopsis is bifunctional and also catalyses the phosphorylation of pyruvate, phosphate dikinase (EC 18.104.22.168), cf. EC 22.214.171.124, [pyruvate, phosphate dikinase] kinase [2-5].
Chastain, C.J.; Botschner, M.; Harrington, G.E.; Thompson, B.J.; Mills, S.E.; Sarath, G.; Chollet, R.
Further analysis of maize C(4) pyruvate,orthophosphate dikinase phosphorylation by its bifunctional regulatory protein using selective substitutions of the regulatory Thr-456 and catalytic His-458 residues