Skip to main content

PIP-Kinases as Key Regulators of Plant Function

  • Chapter
  • First Online:
Lipid Signaling in Plants

Part of the book series: Plant Cell Monographs ((CELLMONO,volume 16))

Abstract

The phosphoinositide pathway arose early in evolution and is conserved in eukaryotic organisms of all kingdoms. Phosphoinositides derive from phosphatidylinositol (PtdIns) by sequential phosphorylation of the lipid head group and can interact with various protein partners to regulate their biochemical activity or subcellular localization. This chapter is concerned with PIP-kinases, the enzymes producing PtdIns-bisphosphates with regulatory function, such as the well-characterized PtdIns(4,5)P2 or the less-well understood PtdIns(3,4)P2 and PtdIns(3,5)P2. In recent years, the study of plant PIP-kinases has revealed new targets for perturbing plant phosphoinositide metabolism and enabled functional investigations on the roles of PtdIns-bisphosphates, including involvement in the regulation of cell polarity, guard cell function, defense responses, and stress signaling. Together with new techniques for lipid analysis and new tools for the visualization of specific lipids, these recent advances have opened the field to exciting discoveries, indicating central roles for PIP-kinases and phosphoinositide signaling in plant function and development.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 129.00
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD 169.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info
Hardcover Book
USD 169.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

References

  • Audhya A, Emr SD (2003) Regulation of PI4, 5P2 synthesis by nuclear-cytoplasmic shuttling of the Mss4 lipid kinase. EMBO J 22:4223–4236

    Article  CAS  PubMed  Google Scholar 

  • Balla T (2005) Inositol-lipid binding motifs: signal integrators through protein-lipid and protein-protein interactions. J Cell Sci 118:2093–2104

    Article  CAS  PubMed  Google Scholar 

  • Balla T (2006) Phosphoinositide-derived messengers in endocrine signaling. J Endocrinol 188:135–153

    Article  CAS  PubMed  Google Scholar 

  • Berridge MJ (1983) Rapid accumulation of inositol trisphosphate reveals that agonists hydrolyse polyphosphoinositides instead of phosphatidylinositol. Biochem J 212:849–858

    CAS  PubMed  Google Scholar 

  • Borner GH, Sherrier DJ, Weimar T, Michaelson LV, Hawkins ND, Macaskill A, Napier JA, Beale MH, Lilley KS, Dupree P (2005) Analysis of detergent-resistant membranes in Arabidopsis. Evidence for plasma membrane lipid rafts. Plant Physiol 137:104–116

    Article  CAS  PubMed  Google Scholar 

  • Braun M, Baluska F, von Witsch M, Menzel D (1999) Redistribution of actin, profilin and phosphatidylinositol-4, 5-bisphosphate in growing and maturing root hairs. Planta 209: 435–443

    Article  CAS  PubMed  Google Scholar 

  • Burden LM, Rao VD, Murray D, Ghirlando R, Doughman SD, Anderson RA, Hurley JH (1999) The flattened face of type II beta phosphatidylinositol phosphate kinase binds acidic phospholipid membranes. Biochemistry 38:15141–15149

    Article  CAS  PubMed  Google Scholar 

  • Carricaburu V, Fournier B (2001) Phosphoinositide fatty acids regulate phosphatidylinositol 5-kinase, phospholipase C and protein kinase C activities. Eur J Biochem 268:1238–1249

    Article  CAS  PubMed  Google Scholar 

  • Cho H, Lee D, Lee SH, Ho WK (2005) Receptor-induced depletion of phosphatidylinositol 4, 5-bisphosphate inhibits inwardly rectifying K + channels in a receptor-specific manner. Proc Natl Acad Sci USA 102:4643–4648

    Article  CAS  PubMed  Google Scholar 

  • Ciruela A, Hinchliffe KA, Divecha N, Irvine RF (2000) Nuclear targeting of the beta isoform of type II phosphatidylinositol phosphate kinase (phosphatidylinositol 5-phosphate 4-kinase) by its alpha-helix 7. Biochem J 346(Pt 3):587–591

    Article  CAS  PubMed  Google Scholar 

  • Cooke FT, Dove SK, McEwen RK, Painter G, Holmes AB, Hall MN, Michell RH, Parker PJ (1998) The stress-activated phosphatidylinositol 3-phosphate 5-kinase Fab1p is essential for vacuole function in S. cerevisiae. Curr Biol 8:1219–1222

    Article  CAS  PubMed  Google Scholar 

  • Cote GG, Yueh YG, Crain RC (1996) Phosphoinositide turnover and its role in plant signal transduction. Subcell Biochem 26:317–343

    CAS  PubMed  Google Scholar 

  • Davis AJ, Im YJ, Dubin JS, Tomer KB, Boss WF (2007) Arabidopsis phosphatidylinositol phosphate kinase 1 binds F-actin and recruits phosphatidylinositol 4-kinase beta1 to the actin cytoskeleton. J Biol Chem 282:14121–14131

    Article  CAS  PubMed  Google Scholar 

  • Desrivieres S, Cooke FT, Parker PJ, Hall MN (1998) MSS4, a phosphatidylinositol-4-phosphate 5-kinase required for organization of the actin cytoskeleton in Saccharomyces cerevisiae. J Biol Chem 273:15787–15793

    Article  CAS  PubMed  Google Scholar 

  • Doughman RL, Firestone AJ, Anderson RA (2003) Phosphatidylinositol phosphate kinases put PI4, 5P(2) in its place. J Membr Biol 194:77–89

    Article  CAS  PubMed  Google Scholar 

  • Dove SK, Cooke FT, Douglas MR, Sayers LG, Parker PJ, Michell RH (1997) Osmotic stress activates phosphatidylinositol-3, 5-bisphosphate synthesis. Nature 390:187–192

    Article  CAS  PubMed  Google Scholar 

  • Dowd PE, Coursol S, Skirpan AL, Kao TH, Gilroy S (2006) Petunia phospholipase c1 is involved in pollen tube growth. Plant Cell 18:1438–1453

    Article  CAS  PubMed  Google Scholar 

  • Drobak BK, Watkins PAC, Valenta R, Dove SK, Lloyd CW, Staiger CJ (1994) Inhibition of plant plasma membrane phosphoinositide phospholipase C by the actin-binding protein, profilin. Plant J 6:389–400

    Article  Google Scholar 

  • Elge S, Brearley C, Xia HJ, Kehr J, Xue HW, Mueller-Roeber B (2001) An Arabidopsis inositol phospholipid kinase strongly expressed in procambial cells: synthesis of PtdIns(4, 5)P2 and PtdIns(3, 4, 5)P3 in insect cells by 5-phosphorylation of precursors. Plant J 26:561–571

    Article  CAS  PubMed  Google Scholar 

  • Fan LM, Zhao Z, Assmann SM (2004) Guard cells: a dynamic signaling model. Curr Opin Plant Biol 7:537–546

    Article  CAS  PubMed  Google Scholar 

  • Gary JD, Wurmser AE, Bonangelino CJ, Weisman LS, Emr SD (1998) Fab1p is essential for PtdIns(3)P 5-kinase activity and the maintenance of vacuolar size and membrane homeostasis. J Cell Biol 143:65–79

    Article  CAS  PubMed  Google Scholar 

  • Golub T, Caroni P (2005) PI(4, 5)P2-dependent microdomain assemblies capture microtubules to promote and control leading edge motility. J Cell Biol 169:151–165

    Article  CAS  PubMed  Google Scholar 

  • Golub T, Wacha S, Caroni P (2004) Spatial and temporal control of signaling through lipid rafts. Curr Opin Neurobiol 14:542–550

    Article  CAS  PubMed  Google Scholar 

  • Gubbels MJ, Vaishnava S, Boot N, Dubremetz JF, Striepen B (2006) A MORN-repeat protein is a dynamic component of the Toxoplasma gondii cell division apparatus. J Cell Sci 119: 2236–2245

    Article  CAS  PubMed  Google Scholar 

  • Heilmann I (2008) Tails wagging the dogs – On phosphoinositides and their fatty acyl moieties. Plant Signal Behav 3:768–771

    PubMed  Google Scholar 

  • Heilmann I, Perera IY, Gross W, Boss WF (1999) Changes in phosphoinositide metabolism with days in culture affect signal transduction pathways in Galdieria sulphuraria. Plant Physiol 119:1331–1339

    Article  CAS  PubMed  Google Scholar 

  • Heilmann I, Perera IY, Gross W, Boss WF (2001) Plasma membrane phosphatidylinositol 4, 5-bisphosphate levels decrease with time in culture. Plant Physiol 126:1507–1518

    Article  CAS  PubMed  Google Scholar 

  • Helling D, Possart A, Cottier S, Klahre U, Kost B (2006) Pollen tube tip growth depends on plasma membrane polarization mediated by tobacco PLC3 activity and endocytic membrane recycling. Plant Cell 18:3519–3534

    Article  CAS  PubMed  Google Scholar 

  • Hilgemann DW, Feng S, Nasuhoglu C (2001) The complex and intriguing lives of PIP2 with ion channels and transporters. Sci STKE 2001:RE19

    Google Scholar 

  • Hinchliffe KA, Ciruela A, Irvine RF (1998) PIPkins1, their substrates and their products: new functions for old enzymes. Biochim Biophys Acta 1436:87–104

    CAS  PubMed  Google Scholar 

  • Im YJ, Davis AJ, Perera IY, Johannes E, Allen NS, Boss WF (2007) The N-terminal membrane occupation and recognition nexus domain of Arabidopsis phosphatidylinositol phosphate kinase 1 regulates enzyme activity. J Biol Chem 282:5443–5452

    Article  CAS  PubMed  Google Scholar 

  • Kilian J, Whitehead D, Horak J, Wanke D, Weinl S, Batistic O, D'Angelo C, Bornberg-Bauer E, Kudla J, Harter K (2007) The AtGenExpress global stress expression data set: protocols, evaluation and model data analysis of UV-B light, drought and cold stress responses. Plant J 50:347–363

    Article  CAS  PubMed  Google Scholar 

  • Kim TJ, Mitsutake S, Igarashi Y (2006) 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. Biochem Biophys Res Commun 342:611–617

    Article  CAS  PubMed  Google Scholar 

  • Kobayashi T, Takematsu H, Yamaji T, Hiramoto S, Kozutsumi Y (2005) Disturbance of sphingolipid biosynthesis abrogates the signaling of Mss4, phosphatidylinositol-4-phosphate 5-kinase, in yeast. J Biol Chem 280:18087–18094

    Article  CAS  PubMed  Google Scholar 

  • König S, Ischebeck T, Lerche J, Stenzel I, Heilmann I (2008) Salt stress-induced association of phosphatidylinositol-4, 5-bisphosphate with clathrin-coated vesicles in plants. Biochem J 415:387–399

    Article  PubMed  Google Scholar 

  • König S, Mosblech A, Heilmann I (2007) Stress-inducible and constitutive phosphoinositide pools have distinct fatty acid patterns in Arabidopsis thaliana. FASEB J 21:1958–1967

    Article  PubMed  Google Scholar 

  • Kost B, Lemichez E, Spielhofer P, Hong Y, Tolias K, Carpenter C, Chua NH (1999) Rac homologues and compartmentalized phosphatidylinositol 4, 5-bisphosphate act in a common pathway to regulate polar pollen tube growth. J Cell Biol 145:317–330

    Article  CAS  PubMed  Google Scholar 

  • Kunz J, Fuelling A, Kolbe L, Anderson RA (2002) Stereo-specific substrate recognition by phosphatidylinositol phosphate kinases is swapped by changing a single amino acid residue. J Biol Chem 277:5611–5619

    Article  CAS  PubMed  Google Scholar 

  • Kunz J, Wilson MP, Kisseleva M, Hurley JH, Majerus PW, Anderson RA (2000) The activation loop of phosphatidylinositol phosphate kinases determines signaling specificity. Mol Cell 5:1–11

    Article  CAS  PubMed  Google Scholar 

  • Kusano H, Testerink C, Vermeer JEM, Tsuge T, Shimada H, Oka A, Munnik T, Aoyama T (2008) The Arabidopsis phosphatidylinositol phosphate 5-kinase PIP5K3 is a key regulator of root hair tip growth. Plant Cell 20:367–380

    Article  CAS  PubMed  Google Scholar 

  • Lacalle RA, Peregil RM, Albar JP, Merino E, Martinez AC, Merida I, Manes S (2007) Type I phosphatidylinositol 4-phosphate 5-kinase controls neutrophil polarity and directional movement. J Cell Biol 179(7):1539–1553

    Article  CAS  PubMed  Google Scholar 

  • Laux T, Fukami K, Thelen M, Golub T, Frey D, Caroni P (2000) GAP43, MARCKS, and CAP23 modulate PI(4, 5)P(2) at plasmalemmal rafts, and regulate cell cortex actin dynamics through a common mechanism. J Cell Biol 149:1455–1472

    Article  CAS  PubMed  Google Scholar 

  • Lee Y, Kim YW, Jeon BW, Park KY, Suh SJ, Seo J, Kwak JM, Martinoia E, Hwang I (2007) Phosphatidylinositol 4, 5-bisphosphate is important for stomatal opening. Plant J 52:803–816

    Article  CAS  PubMed  Google Scholar 

  • Lemmon MA (2003) Phosphoinositide recognition domains. Traffic 4:201–213

    Article  CAS  PubMed  Google Scholar 

  • Lemmon MA, Ferguson KM, Abrams CS (2002) Pleckstrin homology domains and the cytoskeleton. FEBS Lett 513:71–76

    Article  CAS  PubMed  Google Scholar 

  • Löfke C, Ischebeck T, König S, Freitag S, Heilmann I (2008) Alternative metabolic fates of phosphatidylinositol produced by PI-synthase isoforms in Arabidopsis thaliana. Biochem J 413:115–124

    Article  PubMed  Google Scholar 

  • Lou Y, Gou JY, Xue HW (2007) PIP5K9, an Arabidopsis phosphatidylinositol monophosphate kinase, interacts with a cytosolic invertase to negatively regulate sugar-mediated root growth. Plant Cell 19:163–181

    Article  CAS  PubMed  Google Scholar 

  • Maple J, Vojta L, Soll J, Moller SG (2007) ARC3 is a stromal Z-ring accessory protein essential for plastid division. EMBO Rep 8:293–299

    Article  CAS  PubMed  Google Scholar 

  • McEwen RK, Dove SK, Cooke FT, Painter GF, Holmes AB, Shisheva A, Ohya Y, Parker PJ, Michell RH (1999) Complementation analysis in PtdInsP kinase-deficient yeast mutants demonstrates that Schizosaccharomyces pombe and murine Fab1p homologues are phosphatidylinositol 3-phosphate 5-kinases. J Biol Chem 274:33905–33912

    Article  CAS  PubMed  Google Scholar 

  • Meijer HJ, Berrie CP, Iurisci C, Divecha N, Musgrave A, Munnik T (2001) Identification of a new polyphosphoinositide in plants, phosphatidylinositol 5-monophosphate (PtdIns5P), and its accumulation upon osmotic stress. Biochem J 360:491–498

    Article  CAS  PubMed  Google Scholar 

  • Meijer HJ, Divecha N, van den Ende H, Musgrave A, Munnik T (1999) Hyperosmotic stress induces rapid synthesis of phosphatidyl-D-inositol 3, 5-bisphosphate in plant cells. Planta 208:294–298

    Article  CAS  Google Scholar 

  • Meijer HJ, Munnik T (2003) Phospholipid-based signaling in plants. Annu Rev Plant Biol 54:265–306

    Article  CAS  PubMed  Google Scholar 

  • Mikami K, Katagiri T, Iuchi S, Yamaguchi-Shinozaki K, Shinozaki K (1998) A gene encoding phosphatidylinositol-4-phosphate 5-kinase is induced by water stress and abscisic acid in Arabidopsis thaliana. Plant J 15:563–568

    Article  CAS  PubMed  Google Scholar 

  • Mongrand S, Morel J, Laroche J, Claverol S, Carde JP, Hartmann MA, Bonneu M, Simon-Plas F, Lessire R, Bessoule JJ (2004) Lipid rafts in higher plant cells: purification and characterization of Triton X-100-insoluble microdomains from tobacco plasma membrane. J Biol Chem 279:36277–36286

    Article  CAS  PubMed  Google Scholar 

  • Mueller-Roeber B, Pical C (2002) Inositol phospholipid metabolism in Arabidopsis. Characterized and putative isoforms of inositol phospholipid kinase and phosphoinositide-specific phospholipase C. Plant Physiol 130:22–46

    Article  CAS  PubMed  Google Scholar 

  • Perera IY, Davis AJ, Galanopoulou D, Im YJ, Boss WF (2005) Characterization and comparative analysis of Arabidopsis phosphatidylinositol phosphate 5-kinase 10 reveals differences in Arabidopsis and human phosphatidylinositol phosphate kinases. FEBS Lett 579:3427–3432

    Article  CAS  PubMed  Google Scholar 

  • Perera IY, Heilmann I, Boss WF (1999) Transient and sustained increases in inositol 1, 4, 5-trisphosphate precede the differential growth response in gravistimulated maize pulvini. Proc Natl Acad Sci USA 96:5838–5843

    Article  CAS  PubMed  Google Scholar 

  • Perera IY, Heilmann I, Chang SC, Boss WF, Kaufman PB (2001) A role for inositol 1, 4, 5-trisphosphate in gravitropic signaling and the retention of cold-perceived gravistimulation of oat shoot pulvini. Plant Physiol 125:1499–1507

    Article  CAS  PubMed  Google Scholar 

  • Preuss ML, Schmitz AJ, Thole JM, Bonner HK, Otegui MS, Nielsen E (2006) A role for the RabA4b effector protein PI-4Kbeta1 in polarized expansion of root hair cells in Arabidopsis thaliana. J Cell Biol 172:991–998

    Article  CAS  PubMed  Google Scholar 

  • Rao VD, Misra S, Boronenkov IV, Anderson RA, Hurley JH (1998) Structure of type IIbeta phosphatidylinositol phosphate kinase: a protein kinase fold flattened for interfacial phosphorylation. Cell 94:829–839

    Article  CAS  PubMed  Google Scholar 

  • Roth MG (2004) Phosphoinositides in constitutive membrane traffic. Physiol Rev 84:699–730

    Article  CAS  PubMed  Google Scholar 

  • Santarius M, Lee CH, Anderson RA (2006) Supervised membrane swimming: small G-protein lifeguards regulate PIPK signalling and monitor intracellular PtdIns(4, 5)P2 pools. Biochem J 398:1–13

    Article  CAS  PubMed  Google Scholar 

  • Schmid AC, Wise HM, Mitchell CA, Nussbaum R, Woscholski R (2004) Type II phosphoinositide 5-phosphatases have unique sensitivities towards fatty acid composition and head group phosphorylation. FEBS Lett 576:9–13

    Article  CAS  PubMed  Google Scholar 

  • Shimada H, Koizumi M, Kuroki K, Mochizuki M, Fujimoto H, Ohta H, Masuda T, Takamiya K (2004) ARC3, a chloroplast division factor, is a chimera of prokaryotic FtsZ and part of eukaryotic phosphatidylinositol-4-phosphate 5-kinase. Plant Cell Physiol 45:960–967

    Article  CAS  PubMed  Google Scholar 

  • Shyng SL, Cukras CA, Harwood J, Nichols CG (2000) Structural determinants of PIP(2) regulation of inward rectifier K(ATP) channels. J Gen Physiol 116:599–608

    Article  CAS  PubMed  Google Scholar 

  • Stenzel I, Ischebeck T, König S, Holubowska A, Sporysz M, Hause B, Heilmann I (2008) The type B phosphatidylinositol-4-phosphate 5-kinase 3 is essential for root hair formation in Arabidopsis thaliana. Plant Cell 20:124–141

    Article  CAS  PubMed  Google Scholar 

  • Stevenson JM, Perera IY, Heilmann I, Persson S, Boss WF (2000) Inositol signaling and plant growth. Trends Plant Sci 5:252–258

    Article  CAS  PubMed  Google Scholar 

  • Suh BC, Hille B (2005) Regulation of ion channels by phosphatidylinositol 4, 5-bisphosphate. Curr Opin Neurobiol 15:370–378

    Article  CAS  PubMed  Google Scholar 

  • Takeshima H, Komazaki S, Nishi M, Iino M, Kangawa K (2000) Junctophilins: a novel family of junctional membrane complex proteins. Mol Cell 6:11–22

    Article  CAS  PubMed  Google Scholar 

  • Van Leeuwen W, Vermeer JEM, Gadella TWJ Jr, Munnik T (2007) Visualisation of phosphatidylinositol 4, 5-bisphosphate in the plasma membrane of suspension-cultured tobacco BY-2 cells and whole Arabidopsis seedlings. Plant J 52:1014–1026

    Article  PubMed  Google Scholar 

  • Varnai P, Balla T (1998) Visualization of phosphoinositides that bind pleckstrin homology domains: calcium- and agonist-induced dynamic changes and relationship to myo-[3H]inositol-labeled phosphoinositide pools. J Cell Biol 143:501–510

    Article  CAS  PubMed  Google Scholar 

  • Varnai P, Bondeva T, Tamas P, Toth B, Buday L, Hunyady L, Balla T (2005) Selective cellular effects of overexpressed pleckstrin-homology domains that recognize PtdIns(3, 4, 5)P3 suggest their interaction with protein binding partners. J Cell Sci 118:4879–4888

    Article  CAS  PubMed  Google Scholar 

  • Wasteneys GO, Galway ME (2003) Remodeling the cytoskeleton for growth and form: an overview with some new views. Annu Rev Plant Biol 54:691–722

    Article  CAS  PubMed  Google Scholar 

  • Wenk MR, De Camilli P (2004) Protein-lipid interactions and phosphoinositide metabolism in membrane traffic: insights from vesicle recycling in nerve terminals. Proc Natl Acad Sci USA 101:8262–8269

    Article  CAS  PubMed  Google Scholar 

  • Westergren T, Dove SK, Sommarin M, Pical C (2001) AtPIP5K1, an Arabidopsis thaliana phosphatidylinositol phosphate kinase, synthesizes PtdIns(3, 4)P(2) and PtdIns(4, 5)P(2) in vitro and is inhibited by phosphorylation. Biochem J 359:583–589

    Article  CAS  PubMed  Google Scholar 

  • Whatmore J, Morgan CP, Cunningham E, Collison KS, Willison KR, Cockcroft S (1996) ADP-ribosylation factor 1-regulated phospholipase D activity is localized at the plasma membrane and intracellular organelles in HL60 cells. Biochem J 320(Pt 3):785–794

    CAS  PubMed  Google Scholar 

  • Zimmermann P, Hirsch-Hoffmann M, Hennig L, Gruissem W (2004) GENEVESTIGATOR. Arabidopsis microarray database and analysis toolbox. Plant Physiol 136:2621–2632

    Article  CAS  PubMed  Google Scholar 

  • Zonia LE, Munnik T (2004) Osmotically-induced cell swelling versus cell shrinking elicits specific changes in phospholipid signals in tobacco pollen tubes. Plant Physiol 134:813–823

    Article  CAS  PubMed  Google Scholar 

Download references

Acknowledgments

We thank Wendy Boss, Imara Perera, and Yang Ju Im (North Carolina State University) for helpful discussion. We also gratefully acknowledge the financial support through an Emmy Noether grant from the German Research Foundation (DFG, to I. H.).

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Ingo Heilmann .

Editor information

Editors and Affiliations

Rights and permissions

Reprints and permissions

Copyright information

© 2010 Springer-Verlag Berlin Heidelberg

About this chapter

Cite this chapter

Ischebeck, T., Heilmann, I. (2010). PIP-Kinases as Key Regulators of Plant Function. In: Munnik, T. (eds) Lipid Signaling in Plants. Plant Cell Monographs, vol 16. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03873-0_5

Download citation

Publish with us

Policies and ethics