Growing evidence suggests that plasma membranes are locally differentiated into microdomains that are important interaction sites for organization of signaling molecules. These signaling microdomains create local conditions that enhance molecular interactions, excluding others, thereby ensuring speed, spatial localization, and specificity of signal transduction. With the special emphasis on InsP(3) and Ca2+ signaling pathways, we will discuss here the evolving concept of signaling microdomains that provide a key framework for understanding the differential regulation of many cellular target proteins.
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