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Matam Y, Ray BD, Petrache HI. Direct affinity of dopamine to lipid membranes investigated by Nuclear Magnetic Resonance spectroscopy. Neurosci Lett 2016; 618:104-109. [DOI: 10.1016/j.neulet.2016.02.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Revised: 02/25/2016] [Accepted: 02/26/2016] [Indexed: 11/16/2022]
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27
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Matam Y, Johnson MA, Ray BD, Petrache HI. 1H NMR Spectroscopy of Dopamine Interacting with Lipid Vesicles. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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28
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Ramkumar A, Leng X, Lybarger RZ, Petrache HI. Interaction of Adenosine Triphosphate with Phosphatidylcholine Lipid Bilayers. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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29
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Palacio LA, Stanley CB, Burke L, Lybarger R, Petrache HI. Small Angle Neutron Scattering of Fibrinogen Polymerization Kinetics. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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30
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Johnson MA, Tial SH, Ray BD, Seifert S, Petrache HI. The Partitioning Behavior of Free Amino Acids into Lipid Membranes. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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31
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Lybarger RZ, Petrache HI. Multipole Moments of Lipid Headgroups. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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32
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Cavazos AT, Kinnun JJ, Lybarger RZ, Williams JA, Ray BD, Harper PE, Petrache HI, Wassall SR. Vitamin E Differentially Destabilizes Bilayer Structure of Docosahexaenoic and Oleic-Acid Containing Model Membranes. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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33
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Harper PE, Cavazos AT, Kinnun JJ, Petrache HI, Wassall SR. Vitamin E Promotes the Inverse Hexagonal Phase via a Novel Mechanism: Implications for Antioxidant Role. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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34
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Jashnsaz H, Nguyen T, Petrache HI, Pressé S. Inferring Models of Bacterial Dynamics toward Point Sources. PLoS One 2015; 10:e0140428. [PMID: 26466373 PMCID: PMC4605597 DOI: 10.1371/journal.pone.0140428] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 09/22/2015] [Indexed: 11/18/2022] Open
Abstract
Experiments have shown that bacteria can be sensitive to small variations in chemoattractant (CA) concentrations. Motivated by these findings, our focus here is on a regime rarely studied in experiments: bacteria tracking point CA sources (such as food patches or even prey). In tracking point sources, the CA detected by bacteria may show very large spatiotemporal fluctuations which vary with distance from the source. We present a general statistical model to describe how bacteria locate point sources of food on the basis of stochastic event detection, rather than CA gradient information. We show how all model parameters can be directly inferred from single cell tracking data even in the limit of high detection noise. Once parameterized, our model recapitulates bacterial behavior around point sources such as the “volcano effect”. In addition, while the search by bacteria for point sources such as prey may appear random, our model identifies key statistical signatures of a targeted search for a point source given any arbitrary source configuration.
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Johnson MA, Ray BD, Wassall SR, Petrache HI. Equivalent Isopropanol Concentrations of Aromatic Amino Acids Interactions with Lipid Vesicles. J Membr Biol 2015; 248:695-703. [PMID: 25691267 DOI: 10.1007/s00232-015-9781-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 01/30/2015] [Indexed: 11/26/2022]
Abstract
We show that the interaction of aromatic amino acids with lipid bilayers can be characterized by conventional 1D [Formula: see text]H NMR spectroscopy using reference spectra obtained in isopropanol-d8/D[Formula: see text]O solutions. We demonstrate the utility of this method with three different peptides containing tyrosine, tryptophan, or phenylalanine amino acids in the presence of 1,2-dioleoyl-sn-glycero-3-phosphocholine or 1,2-dioleoyl-sn-glycero-3-phosphoserine lipid membranes. In each case, we determine an equivalent isopropanol concentration (EIC) for each hydrogen site of aromatic groups, in essence constructing a map of the chemical environment. These EIC maps provide information on relative affinities of aromatic side chains for either PC or PS bilayers and also inform on amino acid orientation preference when bound to membranes.
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Palacio LA, Stanley CB, Seifert S, Lybarger R, Petrache HI. Small Angle Neutron and X-Ray Scattering of Plasma Glycoprotein Interactions with Lipid Membranes. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.2829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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37
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Figueroa G, Palacio LA, Ray BD, Petrache HI, Lopez-Yunez A. Detecting Counterfeit Pharmaceuticals through UV Spectrophotometry. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.3383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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38
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Weisman M, Johnson MA, Ray BD, Petrache HI. Chelating Agent Induction of Multiphase Coexistence in Lipid Multilayers. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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39
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Johnson MA, Seifert S, Petrache HI. Cation Effects on Zwitterionic Lipid Multilayers. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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40
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Lybarger RZ, Petrache HI. Van Der Waals Interactions of Lipid Membranes in Highly Polarizable Solutions. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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41
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Justice MJ, Petrusca DN, Rogozea AL, Williams JA, Schweitzer KS, Petrache I, Wassall SR, Petrache HI. Effects of lipid interactions on model vesicle engulfment by alveolar macrophages. Biophys J 2014; 106:598-609. [PMID: 24507600 DOI: 10.1016/j.bpj.2013.12.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 11/11/2013] [Accepted: 12/23/2013] [Indexed: 01/18/2023] Open
Abstract
The engulfment function of macrophages relies on complex molecular interactions involving both lipids and proteins. In particular, the clearance of apoptotic bodies (efferocytosis) is enabled by externalization on the cell target of phosphatidylserine lipids, which activate receptors on macrophages, suggesting that (local) specific lipid-protein interactions are required at least for the initiation of efferocytosis. However, in addition to apoptotic cells, macrophages can engulf foreign bodies that vary substantially in size from a few nanometers to microns, suggesting that nonspecific interactions over a wide range of length scales could be relevant. Here, we use model lipid membranes (made of phosphatidylcholine, phosphatidylserine, and ceramide) and rat alveolar macrophages to show how lipid bilayer properties probed by small-angle x-ray scattering and solid-state (2)H NMR correlate with engulfment rates measured by flow cytometry. We find that engulfment of protein-free model lipid vesicles is promoted by the presence of phosphatidylserine lipids but inhibited by ceramide, in accord with a previous study of apoptotic cells. We conclude that the roles of phosphatidylserine and ceramide in phagocytosis is based, at least in part, on lipid-mediated modification of membrane physical properties, including interactions at large length scales as well as local lipid ordering and possible domain formation.
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Johnson M, Seifert S, Petrache HI, Kimble-Hill AC. Phase coexistence in single-lipid membranes induced by buffering agents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9880-9885. [PMID: 25102340 PMCID: PMC4148158 DOI: 10.1021/la5018938] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/29/2014] [Indexed: 05/28/2023]
Abstract
Recent literature has shown that buffers affect the interaction between lipid bilayers through a mechanism that involves van der Waals forces, electrostatics, hydration forces and membrane bending rigidity. This letter shows an additional peculiar effect of buffers on the mixed chain 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) lipid bilayers, namely phase coexistence similar to what was reported by Rappolt et al. for alkali chlorides. The data presented suggest that one phase appears to dehydrate below the value in pure water, while the other phase swells as the concentration of buffer is increased. However, since the two phases must be in osmotic equilibrium with one another, this behavior challenges theoretical models of lipid interactions.
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Kinnun JJ, Mallikarjunaiah KJ, Petrache HI, Brown MF. Elastic deformation and area per lipid of membranes: atomistic view from solid-state deuterium NMR spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1848:246-59. [PMID: 24946141 DOI: 10.1016/j.bbamem.2014.06.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Accepted: 06/06/2014] [Indexed: 12/17/2022]
Abstract
This article reviews the application of solid-state ²H nuclear magnetic resonance (NMR) spectroscopy for investigating the deformation of lipid bilayers at the atomistic level. For liquid-crystalline membranes, the average structure is manifested by the segmental order parameters (SCD) of the lipids. Solid-state ²H NMR yields observables directly related to the stress field of the lipid bilayer. The extent to which lipid bilayers are deformed by osmotic pressure is integral to how lipid-protein interactions affect membrane functions. Calculations of the average area per lipid and related structural properties are pertinent to bilayer remodeling and molecular dynamics (MD) simulations of membranes. To establish structural quantities, such as area per lipid and volumetric bilayer thickness, a mean-torque analysis of ²H NMR order parameters is applied. Osmotic stress is introduced by adding polymer solutions or by gravimetric dehydration, which are thermodynamically equivalent. Solid-state NMR studies of lipids under osmotic stress probe membrane interactions involving collective bilayer undulations, order-director fluctuations, and lipid molecular protrusions. Removal of water yields a reduction of the mean area per lipid, with a corresponding increase in volumetric bilayer thickness, by up to 20% in the liquid-crystalline state. Hydrophobic mismatch can shift protein states involving mechanosensation, transport, and molecular recognition by G-protein-coupled receptors. Measurements of the order parameters versus osmotic pressure yield the elastic area compressibility modulus and the corresponding bilayer thickness at an atomistic level. Solid-state ²H NMR thus reveals how membrane deformation can affect protein conformational changes within the stress field of the lipid bilayer.
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Maasa RK, Justice MJ, Petrusca DN, Petrache HI. Interaction of Model Lipid Vesicles with Alveolar Macrophages. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.2928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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45
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Walls AS, Johnson MA, Petrache HI. Ion Transport and Electrochemical Gradients under DC and AC Signals. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.1733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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46
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Khelifi S, Johnson MA, Ray BD, Petrache HI. Fluorescence Measurements of Aromatic Amino Acids in the Presence of Lipid Membranes. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.2866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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47
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Lybarger RZ, Szymanski K, Ray BD, Petrache HI. Measurements of Solute Polarizabilites Affecting Lipid Membrane Interactions. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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48
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Johnson MA, Slaton J, Rosen ED, Petrache HI. Porosity of Fibrin Networks Measured by Macroion Flow. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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49
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Walsman JM, Stout HD, Ray BD, Petrache HI. Adaptation Rates of E. Coli in Monovalent Salt Solutions. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.2718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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50
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Roark TC, Gurnev PA, Bezrukov SM, Petrache HI. Conductance of Ideally Cation-Selective Ion Channel Depends on Anion Type. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.1407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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