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Recruitment and regulation of phosphatidylinositol phosphate kinase type 1γ by the FERM domain of talin

Nature volume 420, pages 85–89 (2002)Cite this article

Abstract

Membrane phosphoinositides control a variety of cellular processes through the recruitment and/or regulation of cytosolic proteins1,2,3,4. One mechanism ensuring spatial specificity in phosphoinositide signalling is the targeting of enzymes that mediate their metabolism to specific subcellular sites. Phosphatidylinositol phosphate kinase type 1γ (PtdInsPKIγ) is a phosphatidylinositol-4-phosphate 5-kinase that is expressed at high levels in brain, and is concentrated at synapses5,6. Here we show that the predominant brain splice variant of PtdInsPKIγ (PtdInsPKIγ-90) binds, by means of a short carboxy-terminal peptide, to the FERM domain of talin, and is strongly activated by this interaction. Talin, a principal component of focal adhesion plaques7, is also present at synapses. PtdInsPKIγ-90 is expressed in non-neuronal cells, albeit at much lower levels than in neurons, and is concentrated at focal adhesion plaques, where phosphatidylinositol-4,5-bisphosphate has an important regulatory role. Overexpression of PtdInsPKIγ-90, or expression of its C-terminal domain, disrupts focal adhesion plaques, probably by local disruption of normal phosphoinositide balance. These findings define an interaction that has a regulatory role in cell adhesion and suggest new similarities between molecular interactions underlying synaptic junctions and general mechanisms of cell adhesion.

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Figure 1: The 90K splice variant of PtdInsPKIγ is targeted to focal adhesion plaques in non-neuronal cells.
Figure 2: Interaction of PtdInsPKIγ-90, via a short amino acid sequence present in its 28aa-tail, with the FERM domain of talin.
Figure 3: The interaction between talin and PtdInsPKIγ-90 occurs physiologically in brain.
Figure 4: Disruption of normal phosphoinositide metabolism at focal adhesion plaques interferes with cell adhesion in NIH 3T3 cells.

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Acknowledgements

We thank L. Liu, L. Daniell and M. Caleo for technical help. We also thank T. Nagase for the gift of the human PtdInsPKIγ-90 clone KIAA0589; C. Carpenter for the gift of the PtdInsPKIα and -β cDNAs; R. Hynes for the gift of mouse talin 1 cDNA; G. Cesareni and F. Felici for the phage library; and laboratory members and O. Cremona for critical discussion. This work was supported in part by grants from the NIH and from the American Diabetes Association to P.D.C. L.P and G.C. were supported by postdoctoral fellowships from Telethon-Italia, and K.L. is a Howard Hughes Medical Institute predoctoral fellow. S.C. is a Howard Hughes Medical Institute fellow of the Life Sciences Research foundation.

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  1. Lorenzo Pellegrini

    Present address: University of Pennsylvania, Wharton School of Business, Philadelphia, Pennsylvania, 19104, USA

  2. Sunghoe Chang

    Present address: Laboratory of Cellular Neurobiology, Department of Life Science K-JIST, 1 Oryoung-dong, Puk-gu, Kwang-ju, 500-712, Republic of Korea

  3. Gilbert Di Paolo and Lorenzo Pellegrini: These authors contributed equally to this work

Authors and Affiliations

  1. Howard Hughes Medical Institute and Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, 06510, USA

    Gilbert Di Paolo, Lorenzo Pellegrini, Kresimir Letinic, Gianluca Cestra, Roberto Zoncu, Sergei Voronov, Sunghoe Chang, Jun Guo, Markus R. Wenk & Pietro De Camilli

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Di Paolo, G., Pellegrini, L., Letinic, K. et al. Recruitment and regulation of phosphatidylinositol phosphate kinase type 1γ by the FERM domain of talin. Nature 420, 85–89 (2002). https://doi.org/10.1038/nature01147

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