研究领域

Development and application of artificial functional membrane systems on surfaces.

The main research interests of my group are centered on membrane-confined processes such as fusion and fission, ion transport mediated by ion channels and protein pumps as well as protein-lipid and protein-protein interactions occurring at the membrane interface. To understand these processes on a molecular level, we pursue a bottom-up approach and develop and apply model membrane systems. In particular, we have established functional lipid bilayers on highly ordered pore arrays. These so-called pore-spanning membranes suspend nanometer- to micrometer-sized pores in an aluminum or silicon substrate. They separate two aqueous compartments and can hence be envisioned as an intermediate between solid supported and freestanding membranes. With these model system in hand, we are able to investigate transport processes mediated by ion channels such as connexons and protein pumps such as bacteriorhodopsin. Recently, we managed to reconstitute parts of the neuronal fusion machinery enabling us to study the fusion process between a planar pore-spanning membrane and a single vesicle on a molecular level. As pore-spanning membranes are similar to freestanding ones such as giant unilamellar vesicles, domain formation as well as membrane reorganization can be readily observed. We exploit this by studying the impact of protein binding on membrane domain reorganization, a process that is discussed in the context of Shiga toxin uptake into a cell. Similarly, we study the coupling of the plasma membrane to the underlying cytoskeleton mediated by the protein ezrin, making use of our pore-spanning membrane systems. All these studies are, of course not possible without great collaborators, who are in part unified in the Collaborative Research Center (CRC 803, http://www.uni-goettingen.de/en/213080.html) established at the University of Göttingen.

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Das, R. N., Kumar, P., Schütte, O. M., Steinem, C., Dash, J. (2015) A DNA-inspired synthetic ion channel based on G-C base pairing. J. Am. Chem. Soc. 137, 34-37. Kaufeld, T., Steinem, C., Schmidt, C. (2015) Microporous device for local electric recordings on model lipid bilayers. J. Phys. D: Appl. Phys. 48, 025401. Gleisner, M. Mey, I., Barbot, M., Dreker, C., Meinecke, M., Steinem, C. (2014) Driving a planar model system into the 3rd dimension: Generation and control of curved pore-spanning membrane arrays. Soft Matter 10, 6228-6236. Kuhlmann, J.W., Mey, I.P., Steinem, C. (2014) Modulating the lateral tension of solvent-free pore-spanning membranes. Langmuir 30, 8186-8192. Schütte, O.M. Ries, A., Orth, A., Patalag, L.K., Römer, W., Steinem, C., Werz, D.B. (2014) Influence of Gb3 glycosphingolipids differing in their fatty acid chain on the phase behavior of solid supported membranes: Chemical syntheses and impact of Shiga toxin binding. Chem. Sci. 5, 3104-3114. Braunger, J. A., Brückner, B. R., Nehls, S., Pietuch, A., Gerke, V. Mey, I., Janshoff, A., Steinem, C. (2014) Phosphatidylinositol 4,5-bisphosphate alters the number of attachment sites between ezrin and actin filaments: a colloidal probe study. J. Biol. Chem. 289, 9833-9843. Neubacher, H., Carnarius, C., Mey, I., Lazzara, T. D., Steinem, C. (2014) Permeabilization assay for antimicrobial peptides based on pore-spanning lipid membranes on nanoporous alumina. Langmuir 30, 4767-4774. Hafi, N., Grunwald, M., van den Heuvel, L. S., Aspelmeier, T., Chen, J.-H., Zagrebelsky, M., Schütte, O. M., Steinem, C., Korte, M., Munk, A., Walla, P. J. (2014) Fluorescence nanoscopy by polarization modulation and polarization angle narrowing. Nature Methods 11, 579-584. Kozuch, J., Weichbrodt, C., Millo, D., Becker, S., Giller, K., Hildebrandt, P., Steinem, C. (2014) Voltage-dependent structural changes of the membrane-bound anion channel hVDAC1 probed by SEIRA and electrochemical impedance spectroscopy. Phys. Chem. Chem. Phys. 16, 9546-9555. Kumar, Y. P., Das, R. N., Kumar, S., Schütte, O. M., Steinem, C., Dash, J. (2014) Triazole tailored guanosine dinucleosides as biomimetic ion channels to modulate transmembrane potential. Chem. Eur. J. 20, 3023-3028. Stephan, M., Kramer, C., Steinem, C., Janshoff, A. (2014) Binding assay for low molecular weight analytes based on reflectometry of absorbing molecules in porous substrates. Analyst 139, 1987-1992. Stephan, M., Mey, I., Steinem, C., Janshoff, A. (2014) Combining reflectometry and fluorescence microscopy: An assay for the investigation of leakage processes across lipid membranes. Anal. Chem. 86, 1366-1371. Lazzara, T.D., Janshoff, A., Steinem, C. (2014) Biofunctionalization of nanoporous alumina substrates in Handbook of Nanomaterials Properties. Springer, pp 911-940. Braunger, J. A., Kramer, C., Morick, D., Steinem, C. (2013) Solid supported membranes doped with PIP2 – influence of ionic strength and pH on bilayer formation and membrane organization. Langmuir 29, 14204-14213. Hotz, T., Schütte, O. M., Sieling, H., Polupanow, T., Diederichsen, U., Steinem, C., Munk, A. (2013) Idealizing ion channel recordings by a jump segmentation multiresolution filter. IEEE Transact. NanoBiosci. 12, 376-386. Steinem, C. (2013) Funktionelle Lipidmembranen in der Chiptechnologie. Nachrichten aus der Chemie 61, 1101-1104. Frese, D., Steltenkamp, S., Schmitz, S., Steinem, C. (2013) In situ generation of electrochemical gradients across pore-spanning membranes. RSC Adv. 3, 15752-15761. Behn, D., Schatz, M., Hubrich, R., Hoffmeister, H., Krefft, A., Witzgall, R., Steinem, C. (2013) Phosphorylation of C-terminal polycystin-2 influences the interaction with PIGEA14: A QCM study based on solid supported membranes. Biochim. Biophys. Res. Comm. 437, 532-537. Song, C., Weichbrodt, C., Salnikovc, E.S., Dynowskid, M., Forsberg, B.O., Bechinger, B., Steinem, C., de Groot, B.L., Zachariae, U., Zeth, K. (2013) Crystal structure and functional mechanism of a human antimicrobial membrane channel. Proc. Natl. Acad. Sci. U.S.A. 110, 4586-4591. Weiher, F., Schatz, M., Steinem, C., Geyer, A. (2013) Silica precipitation by synthetic minicollagens. Biomacromolecules 14, 683-687.