Figure 10. Proposed model for the role of PHD1 in the galactolipid biosynthetic pathway for chloroplast membranes.
The substrates of the reaction catalyzed by PHD1 are in bold. AGP, ADP-glucose pyrophosphorylase; SS and GBSS, starch synthases; UGP, UDP-Glc pyrophosphorylase; CyUGE, cytosolic UDP-Glucose 4-epimerase; SPS, sucrose phosphate synthase; SPP, sucrose phosphate phosphatase; SuSy, sucrose synthase; Glc-1-P, glucose-1-phosphate; Pi, inorganic phosphate; PPi, pyrophosphate; ATP, adenosine-triphosphate. Intermediates linked by a single reaction are represented by an unbroken line.