Signaling and the Polyphosphoinositide Phosphatases from Plants
Polyphosphoinositides (PPIs) are important signaling molecules involved in membrane and vesicular trafficking events, regulation of the cytoskeleton, and response to stress in plants. PPI phosphatases dephosphorylate the D-3, -4, and -5 positions of the inositol ring within these molecules, and as such, they have the ability to regulate the PPIs present in the cell. There are three categories of PPI phosphatases, and they are classified as to which position phosphate is removed during catalysis. Within each category, there are subgroups of enzymes with unique protein domains, substrate preferences, and expression patterns. Recent genetic analyses of knock-out mutants highlight the fact that PPI phosphatases regulate crucial events during the growth and development of plants.
KeywordsRoot Hair Fiber Cell Hypocotyl Growth Root Hair Development Root Hair Growth
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