Fig. 7.

Target proteins of Stt7 protein kinase in C. reinhardtii. The target proteins identified in this study are marked with arrows. Stt7 is required for the switch from cyclic (CEF) to linear electron flow (LEF) during state transitions that modulate the ATP/NADPH ratio. The dotted arrows indicate that the proteins are potential targets predicted by the search for proteins with an Stt7 substrate site shown in Fig. 6. In the case of Stl1, the likely targets are the same as those of the STN8 kinase from Arabidopsis that is presumably the ortholog of Stl1.