Fig. 1. PKCβ is regulated at the transcriptional and post-transcriptional levels. A. Schematic of the domain structure of themammalian PKCβ isoform. B. PKCβ is regulated by auto-inhibition
through pseudosubstrate sites; binding of diacylglycerol to the C1 domain and Ca2+/phosphatidylserine to the C2 domain results in removal of the pseudosubstrate from the active site.
Engaging both C1 and C2 domains on the membrane results in pseudosubstrate release. Interaction of this activated PKCβ with other targeting proteins may position the enzyme close to
its substrate. N, amino terminus; C, carboxy terminus. C. Schematic representation of the promoter structure of the PKCβ gene with approximate locations of known regulatory regions