Figure 3.
Activation mechanisms of PLC. PLCβ isozymes are activated by Gαq, Gβγ, and Rac. PLCγ isoforms are activated by RTKs. PLCδ activity can be stimulated by Ca2+ within the physiological range through the activation of the other PLC isozymes or influx of Ca2+ through calcium channels. PLCε can be activated by GPCRs and RTKs as well as by small GTPases. PLCζ and PLCη are highly sensitive to Ca2+ and respond to small elevations in intracellular Ca2+ levels. PLCη is also activated by GPCR.
