RAG1 subunit and contains two aspartic acid residues and one glutamic acid residue (D600, D708, and E962, respectively). This active site “DDE motif” is found in many enzymes that cleave DNA

TLS Online TPP Program

#Id: 7274

#Unit 6. System Physiology – Plant

The light-mediated increase of pH and the concentration of Mg2+ activate enzymes of the Calvin–Benson cycle that require Mg2+ for catalysis and are more active at pH 8 than at pH 7: rubisco, fructose 1,6-bisphosphatase, sedoheptulose 1,7-bisphosphatase, and phosphoribulokinase.  The modifications of ionic composition of the chloroplast stroma are reversed rapidly upon darkening.

TLS Online TPP Program

#Id: 7275

#Unit 6. System Physiology – Plant

Light regulates the catalytic activity of four enzymes of the Calvin–Benson cycle directly via the ferredoxin– thioredoxin system

TLS Online TPP Program

#Id: 7276

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7277

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7278

#Unit 6. System Physiology – Plant

Two chloroplast proteins ferredoxin–thioredoxin reductase and thioredoxin regulate five pivotal enzymes within minutes of the

light–dark transition:

TLS Online TPP Program

#Id: 7279

#Unit 6. System Physiology – Plant