Alzheimer's disease (AD) is a devastating neurodegenerative disorder and the leading cause of dementia. It currently affects over five million Americans, and incurs an estimated $150 billion total annual costs to Federal and State Government and Business. Its pathogenesis has been related to the accumulation of amyloid beta (AB) protein in the brain. Several recent lines of evidence strongly support the idea that small soluble AB oligomers, rather than fibrillar aggregates, are the actual neurotoxic species, but their precise mode of action remains unknown. This research proposal operates under the hypothesis that Ap oligomers adsorb onto cell membranes and thereby interfer with their normal biological function, e.g. electrical insulation. Our long-term objective is to understand Ap-membrane interactions and relate them to AD etiology. In the present research project computational techniques and models will be developed with the aim to obtain structural information about AB distribution, uncover their cooperative mode of interaction with the membrane, and aid the interpretation of experimental results from the partner projects. The large length- and time-scales involved in AB aggregation require a coarse-grained simulation approach, but a quantitative link calls for the incorporation of finer scale detail. Our rationale for a successful research will therefore be designed around multiscaling methods. Specifically, we aim to (i) re-introduce chemical detail into our coarse-grained membrane model, (ii) Combine an existing CG peptide model with our improved CGIS bilayer model and thereby quantitatively study the interaction of AB peptides with membranes, and (iii) study the large-scale cooperative aggregation of AP oligomers on membranes and their back effect on the molecular organization of the bilayer.
These aims will benefit strongly from a tight cooperation and a frequent knowledge transfer with experimentally working colleagues in this PPG by offering a comparison with data measured in neutron reflectometry, fluorescence cross-correlation spectroscopy, electrophysiology and impedance spectroscopy. Tools developed Within this PPG are thus collectively optimized. In the long term this research will contribute to an understanding of the molecular basis of AD. It helps to identify new drug targets that might prevent the detrimental molecular processes long before noticeable symptoms materialize, thereby enabling possibilities of a timely treatment.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Program Projects (P01)
Project #
5P01AG032131-03
Application #
8224272
Study Section
Special Emphasis Panel (ZAG1)
Project Start
Project End
2012-06-30
Budget Start
2011-01-01
Budget End
2012-06-30
Support Year
3
Fiscal Year
2011
Total Cost
$139,424
Indirect Cost
Name
Carnegie-Mellon University
Department
Type
DUNS #
052184116
City
Pittsburgh
State
PA
Country
United States
Zip Code
15213
Bereau, Tristan; Wang, Zun-Jing; Deserno, Markus (2014) More than the sum of its parts: coarse-grained peptide-lipid interactions from a simple cross-parametrization. J Chem Phys 140:115101
Gericke, Arne; Leslie, Nicholas R; Lösche, Mathias et al. (2013) PtdIns(4,5)P2-mediated cell signaling: emerging principles and PTEN as a paradigm for regulatory mechanism. Adv Exp Med Biol 991:85-104
Lioudyno, Maria I; Birch, Alexandra M; Tanaka, Brian S et al. (2013) Shaker-related potassium channels in the central medial nucleus of the thalamus are important molecular targets for arousal suppression by volatile general anesthetics. J Neurosci 33:16310-22
Budvytyte, Rima; Valincius, Gintaras; Niaura, Gediminas et al. (2013) Structure and properties of tethered bilayer lipid membranes with unsaturated anchor molecules. Langmuir 29:8645-56
Shenoy, Siddharth S; Nanda, Hirsh; Lösche, Mathias (2012) Membrane association of the PTEN tumor suppressor: electrostatic interaction with phosphatidylserine-containing bilayers and regulatory role of the C-terminal tail. J Struct Biol 180:394-408
Shenoy, Siddharth; Shekhar, Prabhanshu; Heinrich, Frank et al. (2012) Membrane association of the PTEN tumor suppressor: molecular details of the protein-membrane complex from SPR binding studies and neutron reflection. PLoS One 7:e32591
Zan, Goh Haw; Tan, Cheemeng; Deserno, Markus et al. (2012) Hemifusion of giant unilamellar vesicles with planar hydrophobic surfaces: a fluorescence microscopy study. Soft Matter 8:10877-10886
Lioudyno, Maria I; Broccio, Matteo; Sokolov, Yuri et al. (2012) Effect of synthetic aýý peptide oligomers and fluorinated solvents on Kv1.3 channel properties and membrane conductance. PLoS One 7:e35090
Bereau, Tristan; Deserno, Markus; Bachmann, Michael (2011) Structural basis of folding cooperativity in model proteins: insights from a microcanonical perspective. Biophys J 100:2764-72
Yaron, Peter N; Holt, Brian D; Short, Philip A et al. (2011) Single wall carbon nanotubes enter cells by endocytosis and not membrane penetration. J Nanobiotechnology 9:45

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