The AGC (cAMP-dependent, cGMP-dependent and protein kinase C) protein kinase family embraces a collection of protein kinases that display a high degree of sequence similarity within their respective kinase domains. AGC kinase proteins are characterised by three conserved phosphorylation sites that critically regulate their function. The first one is located in an activation loop in the centre of the kinase domain. The two other phosphorylation sites are located outside the kinase domain in a conserved region on its C-terminal side, the AGC-kinase C-terminal domain. These sites serves as phosphorylation-regulated switches to control both intra- and inter-molecular interactions. Without these priming phosphorylations, the kinases are catalytically inactive.
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