TLS Online TPP Program

#Id: 9245

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 9246

#Unit 6. System Physiology – Plant

Diurnal phosphorylated PEPCase is active and incorporation of HCO3 – into PEP. Light stimulates PEPCase‐kinase activity

TLS Online TPP Program

#Id: 9247

#Unit 6. System Physiology – Plant

activation of PPDK through the phosphorolytic cleavage (dephosphorylation) of the phosphorylated Thr (Pi‐dependent/PPi‐forming).

TLS Online TPP Program

#Id: 9248

#Unit 6. System Physiology – Plant

Catalytic activity of PPDK is regulated by phosphorylation by the PPDK‐regulatory protein (PPDK‐RP).

TLS Online TPP Program

#Id: 9249

#Unit 6. System Physiology – Plant

In the dark, PEPCase returns to the inactive form because PEPCase‐kinase is inactivated and a phosphatase releases the phosphoryl group from PEPCase.

TLS Online TPP Program

#Id: 9250

#Unit 6. System Physiology – Plant

The biphasic C4 system reduces photorespiration dramatically by increasing levels of CO2 near Rubisco to enable Rubisco carboxylation to outcompete the oxygenation reaction.