Lateral diffusion of lipids in the DMPG membrane across the anomalous melting regime: effects of NaCl

Sharma, V. K.; Gupta, Jyoti; Mamontov, Eugene

doi:10.1039/d2sm01425d

Cited by 5 publications

(3 citation statements)

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“…These cumulative effects will culminate in bacterial cell death, highlighting the significance of membrane permeability or lateral diffusion of the lipid. This lateral diffusion of lipids within a leaflet is dependent on several factors, including the area per lipid, the membrane curvature, the surface charge density of the membrane, the interaction between additive and lipids, and obstructions. ,,− X-ray/neutron reflectivity measurements reveal that incorporating ILs into the membrane results in a reduction in the thickness of the membrane bilayer, , also corroborated by MD simulations . As the volume compressibility of lipids is insignificant, , the decrease in membrane thickness induces an increase in area per lipid.…”

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confidence: 76%

“…The DPPC membrane presents significant dynamical activity in the spatiotemporal range of the IRIS spectrometer, as revealed by the strong quasielastic broadening, with the incorporation of the IL accelerating the membrane dynamics. Within the spatiotemporal domain of the IRIS spectrometer, lipid molecules predominantly exhibit two distinct dynamical modes: (i) lateral motion within the leaflet and (ii) localized internal motions of lipid alkyl chains. ,,− The observed scattering data can be described as a convolution of two scattering laws, each associated with one of the two motions, expressed as: S normalm normale normalm ( Q , E ) = A ( Q ) italicL normall normala normalt ( Γ l a t , E ) + false( 1 − A ( Q ) L normalt normalo normalt ( Γ l a t + Γ int , E ) …”

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confidence: 99%

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The Physics of Antimicrobial Activity of Ionic Liquids

Sharma,

Gupta,

Mitra

et al. 2024

J. Phys. Chem. Lett.

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The bactericidal potency of ionic liquids (ILs) is well-established, yet their precise mechanism of action remains elusive. Here, we show evidence that the bactericidal action of ILs primarily involves the permeabilization of the bacterial cell membrane. Our findings reveal that ILs exert their effects by directly interacting with the lipid bilayer and enhancing the membrane dynamics. Lateral lipid diffusion is accelerated, which in turn augments membrane permeability, ultimately leading to bacterial death. Furthermore, our results establish a significant connection: an increase in the alkyl chain length of ILs correlates with a notable enhancement in both lipid lateral diffusion and antimicrobial potency. This underscores a compelling correlation between membrane dynamics and antimicrobial effectiveness, providing valuable insights for the rational design and optimization of IL-based antimicrobial agents in healthcare applications.

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confidence: 76%

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confidence: 99%

The Physics of Antimicrobial Activity of Ionic Liquids

Sharma,

Gupta,

Mitra

et al. 2024

J. Phys. Chem. Lett.

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“…[29][30][31][32][33] As a category of electrical stimulation, induced-charge electrophoresis (ICEP) is a useful method to drive the motion of metallodielectric particles (e.g., dielectric particles with metal patches) in alternating current (AC) electric fields due to the highly tunable interactions between the particles and applied field. 11,25,[34][35][36] In the case of a metallodielectric particle undergoing ICEP, the patch geometry is a major determinant of particle locomotion; [37][38][39][40] however, the ability to control patch morphology, and thus particle trajectory, is limited.…”

Section: Introductionmentioning

confidence: 99%

Magnetically locked Janus particle clusters with orientation-dependent motion in AC electric fields

Lee,

Thome,

Cruse

et al. 2023

Nanoscale

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Crosstalk of Nucleic Acid Mimics with Lipid Membranes: A Multifaceted Computational and Experimental Study

T. Magalhães,

S. Coimbra,

M. Silva

et al. 2024

Biochemistry

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Nucleic acid mimics (NAMs) have demonstrated high potential as antibacterial drugs. However, very few studies have assessed their possible diffusion across the bacterial envelope. In this work, we studied NAMs' diffusion in lipid bilayer systems that mimic the bacterial outer membrane using molecular dynamics (MD) simulations. Additionally, we examined the interactions of a NAM sequence with lipid membranes and ascertained the partition constants (K p ) through MD and spectroscopic investigations. The NAM sequences were composed of locked nucleic acid (LNA) and 2′-O-methyl (2′-OMe) residues, whereas the membrane models were composed of 1-palmitoyl-2-oleoyl-glycero-3-phosphocholine (POPC) or 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1′-rac-glycerol) (POPG) phospholipids. The parametrization protocol followed was validated against literature data and demonstrated the reliability of our approach for simulating NAM sequences. Investigation into the interaction of the sequences with zwitterionic and anionic membranes revealed a preference for hydrogen bond formation with the anionic model over the zwitterionic one. Additionally, potential of mean force (PMF) calculations unveiled a lower free energy barrier for translocation across the zwitterionic bilayer model. Contrarily, the partition constants derived suggested a slightly higher partitioning within the anionic membrane, emphasizing a nuanced interplay of factors. Finally, spectroscopic partition measurements with liposomes presented challenges in quantifying the partition of NAMs due to minimal signal variations. However, a tendency for quenching in anionic vesicles suggested a potential, albeit small, partitioning effect that warrants further investigation. In summary, our study revealed that NAMs will not, in principle, be able to cross an intact bacterial outer membrane by passive diffusion.

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Lateral diffusion of lipids in the DMPG membrane across the anomalous melting regime: effects of NaCl

Abstract: Anionic dimyristoyl phosphatidylglycerol (DMPG) membrane in solvents with a low ionic strength is known to exhibit an unusually wide melting regime between the gel and fluid phase characterized by various...

Cited by 5 publications

References 50 publications

The Physics of Antimicrobial Activity of Ionic Liquids

The Physics of Antimicrobial Activity of Ionic Liquids

Magnetically locked Janus particle clusters with orientation-dependent motion in AC electric fields

Crosstalk of Nucleic Acid Mimics with Lipid Membranes: A Multifaceted Computational and Experimental Study

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