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The only protein known to be essential for myelin formation and compaction in the central nervous system is myelin basic protein (MBP). The association of MBP as a positivelycharged protein with negatively charged membranes is crucial for myelination, but the mechanisms by which MBP associates with the myelin membrane remains elusive. Here I demonstrate that the signaling lipid PIP2 is important for the stable association of MBP with cellular membranes. This association is lost upon specific decrease of membrane charges through selective hydrolyzation of PIP2 levels or through elevated intracellular Ca2+ levels. Further experiments implicate that one putative PIP2 binding domain of MBP lies within the exon1 encoded region. The relevance of this proteinlipid interaction was demonstrated for the corpus callosum of mice, after decreasing membrane surface charges in acute brain slices. Here, PIP2 hydrolysis led to the loss of myelin compaction. The results demonstrate that PIP2 plays an important role in MBP association to the plasma membrane. These findings provide a novel link between phosphoinositol metabolism and MBP function in oligodendrocytes in development and disease.
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