FMP Publications

Our publications are recorded in a searchable database since 2010, updates will be added regularly.

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References
Small-molecule screening identifies modulators of aquaporin-2 trafficking
Bogum, J., Faust(*), D., Zühlke, K., Eichhorst, J., Moutty, M. C., Furkert, J., Eldahshan(*), A., Neuenschwander, M., von Kries, J. P., Wiesner, B., Trimpert(*), C., Deen(*), P. M., Valenti(*), G., Rosenthal(*), W.; Klussmann(*), E.
Journal of the American Society of Nephrology : JASN, 24:744-758
(2013)

Tags: Cellular Imaging (Wiesner), Screening Unit (von Kries), Anchored Signaling (Klussmann)

Abstract: In the principal cells of the renal collecting duct, arginine vasopressin (AVP) stimulates the synthesis of cAMP, leading to signaling events that culminate in the phosphorylation of aquaporin-2 water channels and their redistribution from intracellular domains to the plasma membrane via vesicular trafficking. The molecular mechanisms that control aquaporin-2 trafficking and the consequent water reabsorption, however, are not completely understood. Here, we used a cell-based assay and automated immunofluorescence microscopy to screen 17,700 small molecules for inhibitors of the cAMP-dependent redistribution of aquaporin-2. This approach identified 17 inhibitors, including 4-acetyldiphyllin, a selective blocker of vacuolar H(+)-ATPase that increases the pH of intracellular vesicles and causes accumulation of aquaporin-2 in the Golgi compartment. Although 4-acetyldiphyllin did not inhibit forskolin-induced increases in cAMP formation and downstream activation of protein kinase A (PKA), it did prevent cAMP/PKA-dependent phosphorylation at serine 256 of aquaporin-2, which triggers the redistribution to the plasma membrane. It did not, however, prevent cAMP-induced changes to the phosphorylation status at serines 261 or 269. Last, we identified the fungicide fluconazole as an inhibitor of cAMP-mediated redistribution of aquaporin-2, but its target in this pathway remains unknown. In conclusion, our screening approach provides a method to begin dissecting molecular mechanisms underlying AVP-mediated water reabsorption, evidenced by our identification of 4-acetyldiphyllin as a modulator of aquaporin-2 trafficking.

Efficient alpha-helix induction in a linear peptide chain by N-capping with a bridged-tricyclic diproline analogue
Hack(*), V., Reuter(*), C., Opitz, R., Schmieder, P., Beyermann, M., Neudörfl(*), J. M., Kühne, R.; Schmalz(*), H. G.
Angew Chem Int Ed Engl, 52:9539-9543
(2013)

Tags: Solution NMR (Schmieder), Peptide Synthesis (Beyermann), Computational Chemistry/Drug Design (Kühne)

Targeting Platelet G Protein-Coupled Receptors for Antithrombotic Therapy
Falker(*), K., Nazare, M., Wonerow(*), P.; Kozian(*), D. H.
Drug Develop Res, 74:440-449
(2013)

Tags: Medicinal Chemistry (Nazare)

Abstract: Platelets are small anucleated cells produced by bone marrow megakaryocytes that circulate in the blood as sentinels of vascular integrity. They play a pivotal role in the regulation of vascular homeostasis through adhesion to the injured vessel wall, aggregation, propagation of coagulation, and thrombus formation. Furthermore, platelets are also involved in fibrinolysis and the repair of the blood vessel wall, restoring blood flow and vascular integrity. Under pathophysiological conditions such as atherosclerosis, inappropriate platelet aggregation and clot formation can cause vascular occlusions, resulting in myocardial infarctions or stroke that, according to the World Health Organization, represent with more than 10% of worldwide death a major health risk (http://who.int/mediacentre/factsheets/fs310/en/). Over the last several decades, increasing efforts have been made to elucidate the cellular components, signaling pathways, and risk factors contributing to platelet activation with the main goal of providing a sound basis for the development of antiplatelet drugs and novel therapeutic treatment strategies. The family of seven transmembrane receptors, also designated G protein-coupled receptors (GPCRs), represented by approximately 800 members identified in the human genome represent the largest class of receptors and, hence, the richest source of targets for drug discovery. Here, we here provide an overview of the commonly applied therapies targeting platelet-GPCRs as well as a brief summary of novel approaches.

Stabilization of peptides for intracellular applications by phosphoramidate-linked polyethylene glycol chains
Nischan, N., Chakrabarti(*), A., Serwa, R. A., Bovee-Geurts(*), P. H., Brock(*), R.; Hackenberger, C. P.
Angew Chem Int Ed Engl, 52:11920-11924
(2013)

Tags: Chemical Biology II (Hackenberger)

Visualizing Brain Inflammation with a Shingled-Leg Radio-Frequency Head Probe for F-19/H-1 MRI
Waiczies(*), H., Lepore(*), S., Drechsler(*), S., Qadri(*), F., Purfurst(*), B., Sydow, K., Dathe, M., Kühne(*), A., Lindel(*), T., Hoffmann(*), W., Pohlmann(*), A., Niendorf(*), T.; Waiczies(*), S.
Sci Rep-Uk, 3
(2013)

Tags: Peptide-Lipid-Interaction/ Peptide Transport (Dathe)

Abstract: Magnetic resonance imaging (MRI) provides the opportunity of tracking cells in vivo. Major challenges in dissecting cells from the recipient tissue and signal sensitivity constraints albeit exist. In this study, we aimed to tackle these limitations in order to study inflammation in autoimmune encephalomyelitis. We constructed a very small dual-tunable radio frequency (RF) birdcage probe tailored for F-19 (fluorine) and H-1 (proton) MR mouse neuroimaging. The novel design eliminated the need for extra electrical components on the probe structure and afforded a uniform B-1(+)-field as well as good SNR. We employed fluorescently-tagged F-19 nanoparticles and could study the dynamics of inflammatory cells between CNS and lymphatic system during development of encephalomyelitis, even within regions of the brain that are otherwise not easily visualized by conventional probes. F-19/H-1 MR Neuroimaging will allow us to study the nature of immune cell infiltration during brain inflammation over an extensive period of time.

What's in a name? Why these proteins are intrinsically disordered: Why these proteins are intrinsically disordered
Dunker(*), A. K., Babu(*), M. M., Barbar(*), E., Blackledge(*), M., Bondos(*), S. E., Dosztanyi(*), Z., Dyson(*), H. J., Forman-Kay(*), J., Fuxreiter(*), M., Gsponer(*), J., Han(*), K. H., Jones(*), D. T., Longhi(*), S., Metallo(*), S. J., Nishikawa(*), K., Nussinov(*), R., Obradovic(*), Z., Pappu(*), R. V., Rost(*), B., Selenko, P., Subramaniam(*), V., Sussman(*), J. L., Tompa(*), P.; Uversky(*), V. N.
Intrinsically disordered proteins, 1:e24157
(2013)

Tags: In-Cell NMR (Selenko)

Abstract: "What's in a name? That which we call a rose By any other name would smell as sweet." From "Romeo and Juliet", William Shakespeare (1594) This article opens a series of publications on disambiguation of the basic terms used in the field of intrinsically disordered proteins. We start from the beginning, namely from the explanation of what the expression "intrinsically disordered protein" actually means and why this particular term has been chosen as the common denominator for this class of proteins characterized by broad structural, dynamic and functional characteristics.

Oligomerization of Dynamin Superfamily Proteins in Health and Disease
Faelber(*), K., Gao(*), S., Held(*), M., Posor, Y., Haucke, V., Noe(*), F.; Daumke(*), O.
Prog Mol Biol Transl, 117:411-443
(2013)

Tags: Molecular Pharmacology and Cell Biology (Haucke)

Abstract: Proteins of the dynamin superfamily are mechanochemical GTPases, which mediate nucleotide-dependent membrane remodeling events. The founding member dynamin is recruited to the neck of clathrin-coated endocytic vesicles where it oligomerizes into helical filaments. Nucleotide-hydrolysis-induced conformational changes in the oligomer catalyze scission of the vesicle neck. Here, we review recent insights into structure, function, and oligomerization of dynamin superfamily proteins and their roles in human diseases. We describe in detail the molecular mechanisms how dynamin oligomerizes at membranes and introduce a model how oligomerization is linked to membrane fission. Finally, we discuss molecular mechanisms how mutations in dynamin could lead to the congenital diseases, Centronuclear Myopathy and Charcot-Marie Tooth disease.

Spatiotemporal control of endocytosis by phosphatidylinositol-3,4-bisphosphate
Posor, Y., Eichhorn-Grünig, M., Puchkov, D., Schöneberg(*), J., Ullrich(*), A., Lampe, A., Müller(*), R., Zarbakhsh(*), S., Gulluni(*), F., Hirsch(*), E., Krauss, M., Schultz(*), C., Schmoranzer, J., Noe(*), F.; Haucke, V.
Nature, 499:233-+
(2013)

Tags: Molecular Pharmacology and Cell Biology (Haucke)

Abstract: Phosphoinositides serve crucial roles in cell physiology, ranging from cell signalling to membrane traffic(1,2). Among the seven eukaryotic phosphoinositides the best studied species is phosphatidylinositol-4,5-bisphosphate (PI(4,5)P-2), which is concentrated at the plasma membrane where, among other functions, it is required for the nucleation of endocytic clathrin-coated pits(3-6). No phosphatidylinositol other than PI(4,5)P-2 has been implicated in clathrin-mediated endocytosis, whereas the subsequent endosomal stages of the endocytic pathway are dominated by phosphatidylinositol-3-phosphates(PI(3)P)(7). How phosphatidylinositol conversion from PI(4,5)P-2-positive endocytic intermediates to PI(3)P-containing endosomes is achieved is unclear. Here we show that formation of phosphatidylinositol-3,4-bisphosphate (PI(3,4)P-2) by class II phosphatidylinositol-3-kinase C2 alpha (PI(3) K C2 alpha) spatiotemporally controls clathrin-mediated endocytosis. Depletion of PI(3,4)P-2 or PI(3)K C2 alpha impairs the maturation of late-stage clathrin-coated pits before fission. Timed formation of PI(3,4)P-2 by PI(3)K C2 alpha is required for selective enrichment of the BAR domain protein SNX9 at late-stage endocytic intermediates. These findings provide a mechanistic framework for the role of PI(3,4)P-2 in endocytosis and unravel a novel discrete function of PI(3,4)P-2 in a central cell physiological process.

Highly functionalized terpyridines as competitive inhibitors of AKAP-PKA interactions
Schäfer(*), G., Milic(*), J., Eldahshan, A., Götz(*), F., Zühlke(*), K., Schillinger, C., Kreuchwig, A., Elkins(*), J. M., Abdul Azeez(*), K. R., Oder(*), A., Moutty(*), M. C., Masada(*), N., Beerbaum, M., Schlegel, B., Niquet(*), S., Schmieder, P., Krause, G., von Kries, J. P., Cooper(*), D. M., Knapp(*), S., Rademann, J., Rosenthal(*), W.; Klussmann(*), E.
Angew Chem Int Ed Engl, 52:12187-12191
(2013)

Tags: Medicinal Chemistry (Rademann), Screening Unit (von Kries), Solution NMR (Schmieder)

What Goes around Comes around-A Comparative Study of the Influence of Chemical Modifications on the Antimicrobial Properties of Small Cyclic Peptides
Scheinpflug, K., Nikolenko, H., Komarov(*), I. V., Rautenbach(*), M.; Dathe, M.
Pharmaceuticals (Basel), 6:1130-1144
(2013)

Tags: Peptide-Lipid-Interaction/ Peptide Transport (Dathe)

Abstract: Tryptophan and arginine-rich cyclic hexapeptides of the type cyclo-RRRWFW combine high antibacterial activity with rapid cell killing kinetics, but show low toxicity in human cell lines. The peptides fulfil the structural requirements for membrane interaction such as high amphipathicity and cationic charge, but membrane permeabilisation, which is the most common mode of action of antimicrobial peptides (AMPs), could not be observed. Our current studies focus on elucidating a putative membrane translocation mechanism whereupon the peptides might interfere with intracellular processes. These investigations require particular analytical tools: fluorescent analogues and peptides bearing appropriate reactive groups were synthesized and characterized in order to be used in confocal laser scanning microscopy and HPLC analysis. We found that minimal changes in both the cationic and hydrophobic domain of the peptides in most cases led to significant reduction of antimicrobial activity and/or changes in the mode of action. However, we were able to identify two modified peptides which exhibited properties similar to those of the cyclic parent hexapeptide and are suitable for subsequent studies on membrane translocation and uptake into bacterial cells.

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Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP)
Campus Berlin-Buch
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