1
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Li Y, Feng R, Liu M, Guo Y, Zhang Z. Mechanism by Which Cholesterol Induces Sphingomyelin Conformational Changes at an Air/Water Interface. J Phys Chem B 2022; 126:5481-5489. [PMID: 35839485 DOI: 10.1021/acs.jpcb.2c03127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work investigates the interactions in cholesterol and sphingomyelin monolayers at the molecular level by high-resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS). The SFG spectra of natural egg sphingomyelin (ESM) as a function of cholesterol concentration are obtained at an air/water interface under different polarization combinations. The analysis of the spectra shows that cholesterol can induce sphingomyelin conformational changes at an air/water interface. The mechanism is proposed. When cholesterol is inserted into the ESM monolayer, the inherent intramolecular hydrogen bonds between the phosphate moiety and 3OH in the sphingosine backbones are destroyed. During this process, the sphingosine backbones become more ordered, while the conformation of the N-linked long acid chain remains unaltered. The OH of the cholesterol head group can bind to the -PO-2 of the ESM molecule, and the orientation of the -PO-2 in the head groups changes to be more parallel to the interface.
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Affiliation(s)
- Yiyi Li
- Beijing National Laboratory for Molecular Sciences, Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Rongjuan Feng
- Beijing National Laboratory for Molecular Sciences, Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences, Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhen Zhang
- Beijing National Laboratory for Molecular Sciences, Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
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2
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He J, Zhang H, Ma Y, He Y, Liu Z, Liu J, Wang S, Liu Y, Yu K, Jiang J. Sea spray aerosols intervening phospholipids ozonolysis at the air-water interface. JOURNAL OF HAZARDOUS MATERIALS 2022; 430:128466. [PMID: 35739660 DOI: 10.1016/j.jhazmat.2022.128466] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/22/2022] [Accepted: 02/08/2022] [Indexed: 06/15/2023]
Abstract
With more than half of the world's population lives along the coast and in its vicinity, the sea spray aerosols (SSAs) with respect to respiratory system impact has attracted increasing attention. In this paper, ozonolysis of model lung phospholipids intervened by salt cations in SSAs at air-water interface was investigated using acoustic levitation-nano-electrospray ionization-mass spectrometry (AL-nano-ESI-MS). The cation species facilitated the interfacial ozonolysis of phospholipids, and this increased ozonolysis showed a dependence on the concentration of salt cations. The charge number and ion radius of salt cations were also investigated, and the times of increased efficiency for phospholipids ozonolysis at the air-water interface were higher with more charge numbers or lower ion radius. The mechanism study revealed that the electrostatic interaction between the electronegative headgroup of phospholipids and the cations disturbed the packing of phospholipids, and resulted in oleyl chains more vulnerable with ozone. Finally, aerosolization of the salt-dominated artificial seawater and real seawater revealed a significant increase on ozonolysis of phospholipid intervened by salt cations. These results reveal SSAs intervening phospholipids interfacial reaction at the molecule level, which will be beneficial to gain the knowledge of the negative health effect concerning the components involved in SSAs.
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Affiliation(s)
- Jing He
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China
| | - Hong Zhang
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China.
| | - Yingxue Ma
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Yuwei He
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Zhuo Liu
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Junyu Liu
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Sheng Wang
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Yaqi Liu
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Kai Yu
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China
| | - Jie Jiang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China.
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3
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New understanding of electrical activity brought by surface potential of cardiomyocytes. Sci Rep 2021; 11:6593. [PMID: 33758297 PMCID: PMC7988015 DOI: 10.1038/s41598-021-86138-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 03/11/2021] [Indexed: 11/15/2022] Open
Abstract
Aiming at the problem encountered in the previous research: during the electrical activity of cardiomyocytes, the influent ions do not seem to be directly derived from the extracellular fluid. We chose to cut in from the colloidal properties of the cells, follow the basic principles of physical chemistry, and establish hypotheses along the derivation of the structural characteristics of cardiomyocytes. Through the surface ion adsorption experiment and patch clamp experiment of living cells, under the condition of sequentially reducing the concentration of Na+ in the extracellular fluid, we observed the exchange and diffusion of adsorbed ions on the cell surface; the changes of inflow INa, ICa-L and action potential; and correlation between results. The results showed that the hypothesis is true. The observed parameter changes were consistent with the fact that during depolarization of cardiomyocytes, the ions of influx were derived from the inference of adsorbed ions on the cell surface; at the same time, it also provided an objective and realistic explanation for the generation of electrocardiogram.
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4
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Cebecauer M, Amaro M, Jurkiewicz P, Sarmento MJ, Šachl R, Cwiklik L, Hof M. Membrane Lipid Nanodomains. Chem Rev 2018; 118:11259-11297. [PMID: 30362705 DOI: 10.1021/acs.chemrev.8b00322] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Lipid membranes can spontaneously organize their components into domains of different sizes and properties. The organization of membrane lipids into nanodomains might potentially play a role in vital functions of cells and organisms. Model membranes represent attractive systems to study lipid nanodomains, which cannot be directly addressed in living cells with the currently available methods. This review summarizes the knowledge on lipid nanodomains in model membranes and exposes how their specific character contrasts with large-scale phase separation. The overview on lipid nanodomains in membranes composed of diverse lipids (e.g., zwitterionic and anionic glycerophospholipids, ceramides, glycosphingolipids) and cholesterol aims to evidence the impact of chemical, electrostatic, and geometric properties of lipids on nanodomain formation. Furthermore, the effects of curvature, asymmetry, and ions on membrane nanodomains are shown to be highly relevant aspects that may also modulate lipid nanodomains in cellular membranes. Potential mechanisms responsible for the formation and dynamics of nanodomains are discussed with support from available theories and computational studies. A brief description of current fluorescence techniques and analytical tools that enabled progress in lipid nanodomain studies is also included. Further directions are proposed to successfully extend this research to cells.
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Affiliation(s)
- Marek Cebecauer
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
| | - Mariana Amaro
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
| | - Piotr Jurkiewicz
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
| | - Maria João Sarmento
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
| | - Radek Šachl
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
| | - Lukasz Cwiklik
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
| | - Martin Hof
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences , Dolejškova 3 , 18223 Prague 8 , Czech Republic
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5
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Feng RJ, Lin L, Li YY, Liu MH, Guo Y, Zhang Z. Effect of Ca 2+ to Sphingomyelin Investigated by Sum Frequency Generation Vibrational Spectroscopy. Biophys J 2017; 112:2173-2183. [PMID: 28538154 DOI: 10.1016/j.bpj.2017.04.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 04/06/2017] [Accepted: 04/17/2017] [Indexed: 10/19/2022] Open
Abstract
The interactions between Ca2+ ions and sphingomyelin play crucial roles in a wide range of cellular activities. However, little is known about the molecular details of the interactions at interfaces. In this work, we investigated the interactions between Ca2+ ions and egg sphingomyelin (ESM) Langmuir monolayers at the air/water interface by subwavenumber high-resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS). We show that Ca2+ ions can induce ordering of the acyl chains in the ESM monolayer. An analysis of the one alkyl-chain-deuterated ESM revealed that the Ca2+ ions do not affect the N-linked saturated fatty acid chain, although they make the sphingosine backbone become ordered. Further analysis of the SFG-VS spectra shows that the interactions between ESM and Ca2+ ions make the orientation of the methyl group at the end of sphingosine backbone change from pointing downward to pointing upward. Moreover, a large blue shift of the phosphate group at the CaCl2 solution interface indicates, to our knowledge, new cation binding modes. Such binding causes the phosphate moiety to dehydrate, resulting in the conformation change of the phosphate moiety. Based on these results, we propose the molecular mechanism that Ca2+ ions can bind to the phosphate group and subsequently destroy the intramolecular hydrogen bond between the 3-hydroxyl group and the phosphate oxygen, which results in an ordering change of the sphingosine backbone. These findings illustrate the potential application of HR-BB-SFG-VS to investigate lipid-cation interactions and the calcium channel modulated by lipid domain formation through slight structural changes in the membrane lipid. It will also shed light on the interactions of complex molecules at surfaces and interfaces.
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Affiliation(s)
- Rong-Juan Feng
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
| | - Lu Lin
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China; National Center for Nanoscience and Technology, Beijing, China
| | - Yi-Yi Li
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
| | - Ming-Hua Liu
- National Center for Nanoscience and Technology, Beijing, China; Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China.
| | - Zhen Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
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6
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Zhang T, Luo Q, Yang L, Jiang H, Yang H. Characterizing the interactions of two lipid modifications with lipid rafts: farnesyl anchors vs. palmitoyl anchors. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2017; 47:19-30. [PMID: 28585042 DOI: 10.1007/s00249-017-1217-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 04/27/2017] [Accepted: 05/22/2017] [Indexed: 11/30/2022]
Abstract
Farnesyl (Far) and palmitoyl (Pal) anchors play important roles in the traffic of many lipidated proteins. Herein, we show the distinctive interactions and influences of the two lipid modifications on lipid rafts (LRs) and non-raft-like membranes using molecular dynamics simulations. Palmitoyl anchors behave in a more ordered fashion, pack tighter with the lipids of LRs and diffuse at a slower rate than farnesyl anchors in LRs. When interacting with non-raft-like membranes these two types of anchors become less ordered, pack more loosely with lipids, and diffuse at a higher rate. By calculating both the number of contacts per chain and the number of contact atoms per carbon of the two anchors with the lipid components, we found that the palmitoyl chains preferred to associate with the saturated chains of lipids and cholesterol molecules in LRs, while farnesyl chains favored association with saturated chains and unsaturated chains. For non-raft-like membranes, these two lipid anchors had roughly the same preference for the three types of contact lipid chains. Additionally, palmitoyl anchors caused cholesterol to orient more perpendicular to the membrane surface, surrounding lipids to become more ordered, and lipid lateral fluidity to reduce significantly, compared to farnesyl anchors in LRs. By contrast, the POPE and DSPC became much less ordered, cholesterol became more tilted, and lipids became more fluid, when the two types lipid anchors were inserted in non-raft-like membranes. These findings are useful for understanding the traffic mechanisms of lipidated proteins with farnesyl and palmitoyl modifications in cell membranes.
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Affiliation(s)
- Tao Zhang
- School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Qichao Luo
- State Key Laboratory of Drug Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai, 201203, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Linlin Yang
- Department of Pharmacology, School of Basic Medical Sciences, Zhengzhou University, 100 Science Avenue, Zhengzhou, 450001, China
| | - Hualiang Jiang
- School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
- State Key Laboratory of Drug Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai, 201203, China.
- University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Huaiyu Yang
- State Key Laboratory of Drug Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai, 201203, China.
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7
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Pineda De Castro LF, Dopson M, Friedman R. Biological Membranes in Extreme Conditions: Anionic Tetraether Lipid Membranes and Their Interactions with Sodium and Potassium. J Phys Chem B 2016; 120:10628-10634. [PMID: 27668511 DOI: 10.1021/acs.jpcb.6b06206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Archaea such as Sulfolobus acidocaldarius tolerate extreme temperatures and high acidity and can grow in the presence of toxic metals and low concentrations of Na+ or K+. It is believed that their unique tetraether membranes protect them from harsh environments and allow their survival under such conditions. We used molecular dynamics simulations to study membranes comprising glycerol dialkylnonitol tetraether lipids, which are the main component of S. acidocaldarius membranes, in solutions containing different concentrations of NaCl and KCl or with Na+ or K+ counterions (trace cations, 0 M). Anionic binding sites on the membranes were almost 50% occupied in the presence of counterions. The free energy of cation-phosphate complexation and the residence times of ions near the membranes were found to be both ion- and concentration-dependent. Sodium ions had more favorable interactions with the membranes and a longer residence time, whereas higher cation concentrations led to shorter ion residence times. When only counterions were present in the solutions, large residence times suggested that the membrane may function as a cation-attracting reservoir. The results suggested that the ions can be easily transferred to the cytoplasm as needed, explaining the growth curves of S. acidocaldarius under different salinities and pH.
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Affiliation(s)
- Luis Felipe Pineda De Castro
- Computational Chemistry and Biochemistry Research Group (CCBG), Department of Chemistry and Biomedical Sciences, ‡Centre of Excellence "Biomaterials Chemistry", and §Linnaeus University Centre for Ecology and Evolution in Microbial model Systems (EEMiS), Linnæus University , 391 82 Kalmar, Sweden
| | - Mark Dopson
- Computational Chemistry and Biochemistry Research Group (CCBG), Department of Chemistry and Biomedical Sciences, ‡Centre of Excellence "Biomaterials Chemistry", and §Linnaeus University Centre for Ecology and Evolution in Microbial model Systems (EEMiS), Linnæus University , 391 82 Kalmar, Sweden
| | - Ran Friedman
- Computational Chemistry and Biochemistry Research Group (CCBG), Department of Chemistry and Biomedical Sciences, ‡Centre of Excellence "Biomaterials Chemistry", and §Linnaeus University Centre for Ecology and Evolution in Microbial model Systems (EEMiS), Linnæus University , 391 82 Kalmar, Sweden
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8
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Guček A, Jorgačevski J, Górska U, Rituper B, Kreft M, Zorec R. Local electrostatic interactions determine the diameter of fusion pores. Channels (Austin) 2016; 9:96-101. [PMID: 25835258 DOI: 10.1080/19336950.2015.1007825] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In regulated exocytosis vesicular and plasma membranes merge to form a fusion pore in response to stimulation. The nonselective cation HCN channels are involved in the regulation of unitary exocytotic events by at least 2 mechanisms. They can affect SNARE-dependent exocytotic activity indirectly, via the modulation of free intracellular calcium; and/or directly, by altering local cation concentration, which affects fusion pore geometry likely via electrostatic interactions. By monitoring membrane capacitance, we investigated how extracellular cation concentration affects fusion pore diameter in pituitary cells and astrocytes. At low extracellular divalent cation levels predominantly transient fusion events with widely open fusion pores were detected. However, fusion events with predominately narrow fusion pores were present at elevated levels of extracellular trivalent cations. These results show that electrostatic interactions likely help determine the stability of discrete fusion pore states by affecting fusion pore membrane composition.
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Affiliation(s)
- Alenka Guček
- a Laboratory of Neuroendocrinology-Molecular Cell Physiology ; Institute of Pathophysiology ; Faculty of Medicine ; University of Ljubljana ; Ljubljana , Slovenia
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9
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Mao L, Yang L, Zhang Q, Jiang H, Yang H. Effects of ion interactions with a cholesterol-rich bilayer. Biochem Biophys Res Commun 2015; 468:125-9. [PMID: 26529547 DOI: 10.1016/j.bbrc.2015.10.149] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Accepted: 10/27/2015] [Indexed: 11/24/2022]
Abstract
Previous molecular dynamics (MD) simulations of ion-lipid interactions have focused on pure phospholipid bilayers. Many functional microdomains in membranes have a complex composition of cholesterol and phospholipids. Here, we reveal the distinctiveness of the interactions and the effects of the ions on a cholesterol-rich bilayer by performing MD simulations of a cholesterol-rich bilayer with a Na(+)/K(+) mixture or a Na(+)/K(+)/Ca(2+)/Mg(2+) mixture. The simulations reveal that Ca(2+) maintains its dominant role in the interaction with the cholesterol-rich bilayer, but the binding affinity of Mg(2+) to the cholesterol-rich bilayer is even weaker than the affinities of Na(+) and K(+), whereas its interaction with pure phospholipid bilayers is strong and is only slightly weaker than that of Ca(2+). Additionally, it was found that the presence of additional divalent cations induces the headgroups of phospholipids to be more perpendicular to the membrane surface, reducing the lateral movement of lipids and slightly altering the ordering and packing of the cholesterol-rich bilayer, different from divalent cations, which strongly influence that ordering and packing of pure phospholipid bilayers. Therefore, this study indicates that cholesterol in the membrane could affect the interactions between membrane and cations. The findings could be helpful in understanding the biological processes relevant to regulation of cations in cholesterol-rich regions.
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Affiliation(s)
- Lingxue Mao
- School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Linlin Yang
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Qiansen Zhang
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Hualiang Jiang
- School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China; Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai 201203, China.
| | - Huaiyu Yang
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Science, 555 Zuchongzhi Road, Shanghai 201203, China.
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10
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Faustino AF, Guerra GM, Huber RG, Hollmann A, Domingues MM, Barbosa GM, Enguita FJ, Bond PJ, Castanho MARB, Da Poian AT, Almeida FCL, Santos NC, Martins IC. Understanding dengue virus capsid protein disordered N-Terminus and pep14-23-based inhibition. ACS Chem Biol 2015; 10:517-26. [PMID: 25412346 DOI: 10.1021/cb500640t] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Dengue virus (DENV) infection affects millions of people and is becoming a major global disease for which there is no specific available treatment. pep14-23 is a recently designed peptide, based on a conserved segment of DENV capsid (C) protein. It inhibits the interaction of DENV C with host intracellular lipid droplets (LDs), which is crucial for viral replication. Combining bioinformatics and biophysics, here, we analyzed pep14-23 structure and ability to bind different phospholipids, relating that information with the full-length DENV C. We show that pep14-23 acquires α-helical conformation upon binding to negatively charged phospholipid membranes, displaying an asymmetric charge distribution structural arrangement. Structure prediction for the N-terminal segment reveals four viable homodimer orientations that alternatively shield or expose the DENV C hydrophobic pocket. Taken together, these findings suggest a new biological role for the disordered N-terminal region, which may function as an autoinhibitory domain mediating DENV C interaction with its biological targets. The results fit with our current understanding of DENV C and pep14-23 structure and function, paving the way for similar approaches to understanding disordered proteins and improved peptidomimetics drug development strategies against DENV and similar Flavivirus infections.
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Affiliation(s)
- André F. Faustino
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Gabriela M. Guerra
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Roland G. Huber
- Bioinformatics
Institute (BII), Agency for Science, Technology and Research (A*STAR), 30 Biopolis
Street, #07-01 Matrix, 138671 Singapore, Singapore
| | - Axel Hollmann
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Marco M. Domingues
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Glauce M. Barbosa
- Instituto
de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
| | - Francisco J. Enguita
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Peter J. Bond
- Bioinformatics
Institute (BII), Agency for Science, Technology and Research (A*STAR), 30 Biopolis
Street, #07-01 Matrix, 138671 Singapore, Singapore
- Department
of Biological Sciences, National University of Singapore, 14 Science
Drive 4, 117543 Singapore, Singapore
| | - Miguel A. R. B. Castanho
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Andrea T. Da Poian
- Instituto
de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
| | - Fabio C. L. Almeida
- Instituto
de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
- Centro
Nacional de Ressonância Magnética Nuclear, Universidade Federal do Rio de Janeiro and National Institute of Structural Biology and Bioimage, Rio de Janeiro, RJ 21941-902, Brazil
| | - Nuno C. Santos
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Ivo C. Martins
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
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11
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Vila-Viçosa D, Teixeira VH, Santos HAF, Baptista AM, Machuqueiro M. Treatment of Ionic Strength in Biomolecular Simulations of Charged Lipid Bilayers. J Chem Theory Comput 2014; 10:5483-92. [DOI: 10.1021/ct500680q] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Diogo Vila-Viçosa
- Centro
de Química e Bioquímica and Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Vitor H. Teixeira
- Centro
de Química e Bioquímica and Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Hugo A. F. Santos
- Faculty
of Sciences, BioFIG−Centre for Biodiversity, Functional and
Integrative Genomics, University of Lisboa, 1649-004 Lisboa, Portugal
| | - António M. Baptista
- Instituto
de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Miguel Machuqueiro
- Centro
de Química e Bioquímica and Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
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12
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Przybyło M, Drabik D, Łukawski M, Langner M. Effect of Monovalent Anions on Water Transmembrane Transport. J Phys Chem B 2014; 118:11470-9. [DOI: 10.1021/jp505687d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Magda Przybyło
- Laboratory for Biophysics of Macromolecular Aggregates,
Institute of Biomedical Engineering and Instrumentation, Wroclaw University of Technology, Pl. Grunwaldzki 13, 50-370 Wroclaw, Poland
| | - Dominik Drabik
- Laboratory for Biophysics of Macromolecular Aggregates,
Institute of Biomedical Engineering and Instrumentation, Wroclaw University of Technology, Pl. Grunwaldzki 13, 50-370 Wroclaw, Poland
| | - Maciej Łukawski
- Laboratory for Biophysics of Macromolecular Aggregates,
Institute of Biomedical Engineering and Instrumentation, Wroclaw University of Technology, Pl. Grunwaldzki 13, 50-370 Wroclaw, Poland
| | - Marek Langner
- Laboratory for Biophysics of Macromolecular Aggregates,
Institute of Biomedical Engineering and Instrumentation, Wroclaw University of Technology, Pl. Grunwaldzki 13, 50-370 Wroclaw, Poland
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13
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Yang PW, Lin TL, Hu Y, Jeng US. Formation of divalent ion mediated anionic disc bicelle-DNA complexes. SOFT MATTER 2014; 10:2313-2319. [PMID: 24795965 DOI: 10.1039/c3sm52775a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Disc-shaped bicelles are formed by mixing long-chain lipids with short-chain lipids at suitable molar ratios and they have a relatively uniform size, typically around a few tens of nanometers in diameter. Different from the typically formulated cationic or anionic liposome–DNA complexes, which are used as nonviral vectors for improving the transfection efficiency of gene therapy, a novel way of packing the DNA can be developed by using the much smaller disc-like bicelles. We demonstrate that anionic lipid bicelle-ion–DNA (AB–DNA) complexes can be formed with the help of divalent ions. Multi-stacked AB–DNA complexes can be formed with diameters of around 50–100 nm and lengths of around 50–150 nm as revealed by TEM. Using the anionic lipid–DNA complexes has the advantage of lower cytotoxicity than using cationic lipids. The interaction of DNA with anionic bicelles was investigated by SAXS. It was found that the anionic bicelle could not form stable complexes with DNA at low calcium ion concentrations, such as 1 mM. The AB–DNA complexes can be formed in the investigated range of 10 mM to 100 mM calcium ion concentrations. However, for an equal anionic lipid charge and DNA charge system, an ion-membrane phase (multilamellar vesicles) would gradually appear as the calcium ion concentration is increased above a critical concentration. It indicates that DNA could be packed closer at above the critical divalent ion concentration. If more DNA is added to such a two-phase coexistence system (originally with the total anionic lipid charge equal to that of DNA), the ion-membrane phase could be transformed into the AB–DNA complexes. As a result, more DNA can be packed in the form of AB–DNA complexes at above the critical calcium ion concentration.
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14
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Qiao BF, Olvera de la Cruz M. Driving Force for Crystallization of Anionic Lipid Membranes Revealed by Atomistic Simulations. J Phys Chem B 2013; 117:5073-80. [DOI: 10.1021/jp401767c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bao Fu Qiao
- Department
of Materials Science and Engineering, and ‡Department of Chemistry, Northwestern University, Evanston, Illinois
60208, United States
| | - Monica Olvera de la Cruz
- Department
of Materials Science and Engineering, and ‡Department of Chemistry, Northwestern University, Evanston, Illinois
60208, United States
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15
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Molenbroek E, Straathof N, Dück S, Rashid Z, van Lenthe JH, Lutz M, Gandubert A, Klein Gebbink RJM, De Cola L, Bonnet S. Zinc coordination to the bapbpy ligand in homogeneous solutions and at liposomes: zinc detection via fluorescence enhancement. Dalton Trans 2013; 42:2973-84. [PMID: 23258585 DOI: 10.1039/c2dt32488a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, the complexation of the bapbpy ligand to zinc dichloride is described (bapbpy = 6,6′-bis(2-aminopyridyl)-2,2′-bipyridine). The water-soluble, colorless complex [Zn(bapbpy)Cl]Cl·2H2O (compound 2·H2O) was synthesized; its X-ray crystal structure shows a mononuclear, pentacoordinated geometry with one chloride ligand in apical position. Upon excitation of its lowest-energy absorption band (375 nm) compound 2 shows intense emission (Φ = 0.50) at 418 nm in aqueous solution, and an excited state lifetime of 5 ns at room temperature. Photophysical measurements, DFT, and TD-DFT calculations prove that emission arises from vibronically coupled Ligand-to-Ligand Charge Transfer singlet excited states, characterized by electron density flowing from the lone pairs of the non-coordinated NH bridges to the π* orbitals of the pyridine rings. Monofunctionalization of the ligand with one long alkyl chain was realized to afford ligand 3, which can be inserted into dimyristoylphosphatidylglycerol (DMPG) or dimyristoylphosphatidylcholine (DMPC) unilamellar vesicles. For negatively charged DMPG membranes the addition of a zinc salt to the vesicles leads to an enhancement of the fluorescence due to zinc coordination to the membrane-embedded tetrapyridyl ligand. No changes were observed for the zwitterionic DMPC lipids, where binding of the Zn ions does not take place. A modest binding constant was found (5 × 10(6) M(−1)) for the coordination of zinc cations to bapbpy-functionalized DMPG membranes, which allows for the detection of micromolar zinc concentrations in aqueous solution. The influence of chloride concentration and other transition metal ions on the zinc binding was evaluated, and the potential of liposome-supported metal chelators such as ligand 3 for zinc detection in biological media is discussed.
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Affiliation(s)
- Elwin Molenbroek
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, Leiden, 2300 RA, The Netherlands
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16
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Mao Y, Du Y, Cang X, Wang J, Chen Z, Yang H, Jiang H. Binding Competition to the POPG Lipid Bilayer of Ca2+, Mg2+, Na+, and K+ in Different Ion Mixtures and Biological Implication. J Phys Chem B 2013; 117:850-8. [DOI: 10.1021/jp310163z] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yanyan Mao
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
| | - Yun Du
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
| | - Xiaohui Cang
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
| | - Jinan Wang
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
| | - Zhuxi Chen
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
| | - Huaiyu Yang
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
| | - Hualiang Jiang
- Drug Discovery and Design Center, State Key Laboratory
of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai
201203, China
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17
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Pan J, Heberle FA, Tristram-Nagle S, Szymanski M, Koepfinger M, Katsaras J, Kučerka N. Molecular structures of fluid phase phosphatidylglycerol bilayers as determined by small angle neutron and X-ray scattering. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:2135-48. [PMID: 22583835 DOI: 10.1016/j.bbamem.2012.05.007] [Citation(s) in RCA: 160] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 03/22/2012] [Accepted: 05/07/2012] [Indexed: 10/28/2022]
Abstract
We have determined the molecular structures of commonly used phosphatidylglycerols (PGs) in the commonly accepted biologically relevant fluid phase. This was done by simultaneously analyzing small angle neutron and X-ray scattering data, with the constraint of measured lipid volumes. We report the temperature dependence of bilayer parameters obtained using the one-dimensional scattering density profile model - which was derived from molecular dynamics simulations - including the area per lipid, the overall bilayer thickness, as well as other intrabilayer parameters (e.g., hydrocarbon thickness). Lipid areas are found to be larger than their phosphatidylcholine (PC) counterparts, a result likely due to repulsive electrostatic interactions taking place between the charged PG headgroups even in the presence of sodium counterions. In general, PG and PC bilayers show a similar response to changes in temperature and chain length, but differ in their response to chain unsaturation. For example, compared to PC bilayers, the inclusion of a first double bond in PG lipids results in a smaller incremental change to the area per lipid and bilayer thickness. However, the extrapolated lipid area of saturated PG lipids to infinite chain length is found to be similar to that of PCs, an indication of the glycerol-carbonyl backbone's pivotal role in influencing the lipid-water interface.
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Affiliation(s)
- Jianjun Pan
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6100, USA.
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18
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Rogasevskaia TP, Churchward MA, Coorssen JR. Anionic lipids in Ca(2+)-triggered fusion. Cell Calcium 2012; 52:259-69. [PMID: 22516687 DOI: 10.1016/j.ceca.2012.03.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 03/20/2012] [Accepted: 03/25/2012] [Indexed: 01/30/2023]
Abstract
Anionic lipids are native membrane components that have a profound impact on many cellular processes, including regulated exocytosis. Nonetheless, the full nature of their contribution to the fast, Ca(2+)-triggered fusion pathway remains poorly defined. Here we utilize the tightly coupled quantitative molecular and functional analyses enabled by the cortical vesicle model system to elucidate the roles of specific anionic lipids in the docking, priming and fusion steps of regulated release. Studies with cholesterol sulfate established that effectively localized anionic lipids could contribute to Ca(2+)-sensing and even bind Ca(2+) directly as effectors of necessary membrane rearrangements. The data thus support a role for phosphatidylserine in Ca(2+) sensing. In contrast, phosphatidylinositol would appear to serve regulatory functions in the physiological fusion machine, contributing to priming and thus the modulation and tuning of the fusion process. We note the complexities associated with establishing the specific roles of (anionic) lipids in the native fusion mechanism, including their localization and interactions with other critical components that also remain to be more clearly and quantitatively defined.
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Affiliation(s)
- Tatiana P Rogasevskaia
- Department of Chemical & Biological Sciences, Mount Royal University, 4825 Mount Royal Gate SW, Calgary, AB, T3E 6K6 Canada
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19
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Concentration dependence of NaCl ion distributions around DPPC lipid bilayers. Interdiscip Sci 2011; 3:272-82. [PMID: 22179761 DOI: 10.1007/s12539-011-0107-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 04/04/2011] [Accepted: 04/08/2011] [Indexed: 10/14/2022]
Abstract
We study the coordination of excess NaCl to zwitterionic DPPC lipid bilayers using molecular dynamics simulations. We find that Na ions directly coordinate with the DPPC lipid carbonyl groups. As the number of excess ions increases, the number of coordinated ions increases, until it reaches a plateau at a ratio near 1 ion per every four lipids at 310 K, and 1 ion per every six lipids at 323 K. The area per lipid decreases as the number of excess ions is increased. For low number of ions per lipids (1:16 and 1:8), most Na ions are bound to the lipid carbonyls, while the Cl form an ionic cloud around the lipid choline groups. As a result of the Na binding, the lipid has an effective positive charge density. The residence time of Na ions bound to the lipid is longer than 40 ns, while Cl ions exchange faster than the nanoseconds timescale. We find that the bound Na ions replace ordered water around the carbonyls. The net linear charge density near the carbonyl groups stays positive, regardless of the presence of excess salt in the solution.
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