Abstract:
:Phosphoinositides (PIs) and proteins involved in the PI signaling pathway are distributed in the nucleus as well as at the plasma membrane and in the cytoplasm, although their nuclear localization mechanisms have not been clarified in detail. Generally, proteins that shuttle between the cytoplasm and nucleus contain nuclear localization signal (NLS) and nuclear export signal (NES) sequences for nuclear import and export, respectively. They bind to specific carrier proteins of the importin/exportin family and are transported to and from the nucleus. Thus there is a steady state shuttling of the cargo molecules to and from the nucleus, and the shift in equilibrium determines their nuclear or cytoplasmic localization. Our previous studies have shown that phospholipase C (PLC)-delta1, regarded as having cytoplasmic- or plasma membrane-bound localization, accumulates in the nucleus when its NES sequence is disrupted. In addition, a cluster of positively charged residues on the surface of the catalytic barrel is important for nuclear import. In quiescent cells, the shuttling equilibrium seems to be shifted to the nuclear export of PLCdelta1. In this review, recent findings regarding the molecular machineries and mechanisms of the nucleocytoplasmic shuttling of PLCdelta1 will be discussed. It is important to know when and how they are regulated. A shift in the equilibrium in a certain stage of the cell cycle or by external stimuli is possible and resulting changes in the intra-nuclear environments (or architectures) may alter proliferation and differentiation patterns. Evidences support the idea that an increase in the levels of intracellular Ca2+ shifts the equilibrium to the nuclear import of PLCdelta1. A myriad of external stimuli have also been reported to change the nuclear PI metabolism following accelerated accumulation in the nucleus of other phospholipases such as phospholipase A2 and phospholipase D in addition to PLC isoforms such as PLCbeta1 and PLCgamma1. The consequence of the nuclear accumulation of PLC is also discussed.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Yagisawa Hdoi
10.1002/jcb.20677subject
Has Abstractpub_date
2006-02-01 00:00:00pages
233-43issue
2eissn
0730-2312issn
1097-4644journal_volume
97pub_type
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