Translocation of TMEM55B (type I phosphatidylinositol 4,5-bisphosphate 4-phosphatase) to the nucleus under conditions of cellular stress leads to dephosphorylation of nuclear PI(4,5)P2 to PI5P, thus increasing the concentration of PI5P in the nucleus (Zou et al. 2007). PIP2 and its derivatives are not associated with nuclear envelope structures (Bornenkov et al. 1998) but localize to poorly defined subnuclear compartments called nuclear specks (reviewed by Barlow et al. 2010).
Marjanovic, J, Majerus, PW, Kisseleva, MV, Wilson, M, Zou, J
phosphatidylinositol-4,5-bisphosphate 4-phosphatase activity of TMEM55B [nucleoplasm]
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