The interaction between the pleckstrin homology domain of ceramide kinase and phosphatidylinositol 4,5-bisphosphate regulates the plasma membrane targeting and ceramide 1-phosphate levels
- Department of Biomembrane and Biofunctional Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita 12. Nishi 6, Kita-ku, Sapporo 060-0812 (Japan)
Ceramide kinase (CERK) converts ceramide to ceramide-1-phosphate (C1P), which has recently emerged as a new bioactive molecule capable of regulating diverse cellular functions. The N-terminus of the CERK protein encompasses a sequence motif known as a pleckstrin homology (PH) domain. Although the PH domain was previously demonstrated to be an important domain for the subcellular localization of CERK, the precise properties of this domain remained unclear. In this study, we reveal that the PH domain of CERK exhibits high affinity for phosphatidylinositol 4,5-bisphosphate (PI(4,5)P{sub 2}), among other lipids. Furthermore, in COS7 cells, GFP-fused CERK translocated rapidly from the cytoplasm to the plasma membrane in response to hyper-osmotic stress, which is known to increase the intracellular PI(4,5)P{sub 2} levels, whereas a PH domain deletion mutant did not. Additionally, in [{sup 32}P]orthophosphate-labeled COS7 cells, the translocation of CERK to the plasma membrane induced a 2.8-fold increase in C1P levels. The study presented here provides insight into the crucial role of the CERK-PH domain in plasma membrane targeting, through its binding to PI(4,5)P{sub 2}, and subsequent induction of C1P production in the vicinity of the membrane.
- OSTI ID:
- 20798884
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 342, Issue 2; Other Information: DOI: 10.1016/j.bbrc.2006.01.170; PII: S0006-291X(06)00253-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
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