Influence of light on activity of adenylate kinase and pterin-protein complexes from pea chloroplasts.

The activity of adenylate kinase (AK) and of pterin-protein complexes (PPC), whose proteins have adenylate kinase activity comparable to that of the enzyme was studied. It was established that light inhibits adenylate kinase activity and that this effect is partially eliminated by phosphate ions. The forward and reverse reactions catalyzed by AK and PPC were studied and it was found that the activity of native protein complexes is different in the forward and reverse reactions. The thermostable protein both of adenylate kinase and of the pterin-protein complexes had identical activity in the ADP dismutation and the reverse reaction.