Abstract
Phosphatidylinositol-4,5-bisphosphate [PI(4,5)P2 or PIP2] is a direct modulator of a diverse array of proteins in eukaryotic cells. The functional integrity of transmembrane proteins, such as ion channels and transporters, is critically dependent on specific interactions with PIP2 and other phosphoinositides. Here, we report a novel requirement for PIP2 in the activation of the epidermal growth factor receptor (EGFR). Down-regulation of PIP2 levels either via pharmacological inhibition of PI kinase activity, or via manipulation of the levels of the lipid kinase PIP5K1α and the lipid phosphatase synaptojanin, reduced EGFR tyrosine phosphorylation, whereas up-regulation of PIP2 levels via overexpression of PIP5K1α had the opposite effect. A cluster of positively charged residues in the juxtamembrane domain (basic JD) of EGFR is likely to mediate binding of EGFR to PIP2 and PIP2-dependent regulation of EGFR activation. A peptide mimicking the EGFR juxtamembrane domain that was assayed by surface plasmon resonance displayed strong binding to PIP2. Neutralization of positively charged amino acids abolished EGFR/PIP2 interaction in the context of this peptide and down-regulated epidermal growth factor (EGF)-induced EGFR auto-phosphorylation and EGF-induced EGFR signaling to ion channels in the context of the full-length receptor. These results suggest that EGFR activation and downstream signaling depend on interactions of EGFR with PIP2 and point to the basic JD’s critical involvement in these interactions. The addition of this very different class of membrane proteins to ion channels and transporters suggests that PIP2 may serve as a general modulator of the activity of many diverse eukaryotic transmembrane proteins through their basic JDs.
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Acknowledgments
This work was supported by a National Institutes of Health grant (HL-59949) to DEL. Support for RI and YC was provided by NIH grant DK-38761. We would like to thank Heikki Vaananen, Sophia Gruszecki, Samantha Lee, and Dr. Mei Zhang for excellent technical assistance, Drs. Pietro DeCamilli (Yale University, CT) for the gift of synaptojanin, and Drs. Show-Ling Shyng and Colin Nichols (Oregon Health and Science University, OR, USA and Washington University, MO, USA) for the gift of PI(5)P kinase. We thank Dr. Qi Zhao for help with the analysis of the FACS data. We would also like to thank Drs. Giorgos Panayotou (Fleming Institute, Athens, Greece), Mitchell Goldfarb (Hunter College, NY, USA), Michael Ehlers (Duke Neurobiology, NC, USA), Julia Sable (Columbia University, NY, USA), Tibor Rohacs (UMDNJ), Stuart Aaronson (Department of Oncological Sciences, MSSM) and the Logothetis laboratory members for insightful discussions and comments on the manuscript.
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Figure S1
Mutations in the JD of EGFR that impair its phosphorylation do not interfere with the surface expression of the receptor. Data summary (mean ± S.E.) of relative (% of wild-type) surface expression levels for wild-type and mutant EGFR from 2 independent experiments (number of oocytes analyzed in each experiment is indicated on the top of each bar). Total EGFR levels in the membrane fraction of these oocytes were similar to those presented in Figure 2B. (TIFF 1.45 MB)
Figure S2
Wortmannin treatment reduces PIP 2 levels. Oocytes were incubated for 1h in the presence and absence of wortmannin (15µM) and subsequently lysed for preparation of the membrane fraction. Extraction of membrane lipids and PIP2 ELISA assay are described under Supplemental Methods. Data points corresponding to known amounts of PIP2 were fitted to the equation y = A2 + (A1-A2)/(1 + (x/x0)p) with A1=2.14965±0.42526, A2=-0.05576±0.75398, x0=20.3308524.0873 and p=0.52726±0.39675. PIP2 levels in each sample, calculated from the standard curve (left panel), were normalized for PIP2 levels in the control non-treated sample from the same experiment. Data from 3 experiments are presented as mean ± S.E (right panel). Statistical significance is indicated. (TIFF 3.10 MB)
Figure S3
Downregulation of PI(5)PKIα does not affect cell surface expression of EGFR a) Histograms of mean EGFR extracellular fluorescence intensity measured by FACS analysis, as described in Supplementary Methods. Background was estimated by performing the experiment in the absence of primary antibody (Negative, neg). The rest of the experimental conditions correspond to Fig. 4c. b) Bars representing the effect of PIPKIα siRNA transfection on surface EGFR in the presence and absence of EGF (%±SE) were calculated from three experiments for each condition. The means were not significantly different in the presence of siRNA (t-test). (TIFF 3.14 MB)
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Michailidis, I.E., Rusinova, R., Georgakopoulos, A. et al. Phosphatidylinositol-4,5-bisphosphate regulates epidermal growth factor receptor activation. Pflugers Arch - Eur J Physiol 461, 387–397 (2011). https://doi.org/10.1007/s00424-010-0904-3
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DOI: https://doi.org/10.1007/s00424-010-0904-3