信号转导与蛋白质活性: Inactive protein kinase 3 Protein phosphatase 2 Phosphate T Active protein kinase 3 hosphate ATP ADP ATP ADP ATP ADP Protein kinase 2 RESPONSE Protein phosphatase 1 phosphatase 3 Phosphate Inactive Active Inactive Active protein kinase 1 protein kinase 1 protein substrate protein substrate (e. g, transcription factor) (e.g, capable of binding to promoter sequence in DNA)18 信号转导与蛋白质活性 :