» Articles » PMID: 18390624

Order Parameters and Areas in Fluid-phase Oriented Lipid Membranes Using Wide Angle X-ray Scattering

Overview
Journal Biophys J
Publisher Cell Press
Specialty Biophysics
Date 2008 Apr 9
PMID 18390624
Citations 74
Authors
Affiliations
Soon will be listed here.
Abstract

We used wide angle x-ray scattering (WAXS) from stacks of oriented lipid bilayers to measure chain orientational order parameters and lipid areas in model membranes consisting of mixtures of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC)/cholesterol and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)/cholesterol in fluid phases. The addition of 40% cholesterol to either DOPC or DPPC changes the WAXS pattern due to an increase in acyl chain orientational order, which is one of the main properties distinguishing the cholesterol-rich liquid-ordered (Lo) phase from the liquid-disordered (Ld) phase. In contrast, powder x-ray data from multilamellar vesicles does not yield information about orientational order, and the scattering from the Lo and Ld phases looks similar. An analytical model to describe the relationship between the chain orientational distribution and WAXS data was used to obtain an average orientational order parameter, S(x-ray). When 40% cholesterol is added to either DOPC or DPPC, S(x-ray) more than doubles, consistent with previous NMR order parameter measurements. By combining information about the average chain orientation with the chain-chain correlation spacing, we extended a commonly used method for calculating areas for gel-phase lipids to fluid-phase lipids and obtained agreement to within 5% of literature values.

Citing Articles

Look Beyond Plasma Membrane Biophysics: Revealing Considerable Variability of the Dipole Potential Between Plasma and Organelle Membranes of Living Cells.

Szabo M, Cs Szabo B, Kurtan K, Varga Z, Panyi G, Nagy P Int J Mol Sci. 2025; 26(3).

PMID: 39940660 PMC: 11816637. DOI: 10.3390/ijms26030889.


All-Atom Simulations Reveal the Effect of Membrane Composition on the Signaling of the NKG2A/CD94/HLA-E Immune Receptor Complex.

Ljubic M, Perdih A, Borisek J J Chem Inf Model. 2024; 64(24):9374-9387.

PMID: 39621690 PMC: 11684013. DOI: 10.1021/acs.jcim.4c01357.


How Unnatural Amino Acids in Antimicrobial Peptides Change Interactions with Lipid Model Membranes.

Mitra S, Chen M, Stedman F, Hernandez J, Kumble G, Kang X J Phys Chem B. 2024; 128(40):9772-9784.

PMID: 39328031 PMC: 11472314. DOI: 10.1021/acs.jpcb.4c04152.


Interaction of MRI Contrast Agent [Gd(DOTA)] with Lipid Membranes: A Molecular Dynamics Study.

Oliveira A, Filipe H, Geraldes C, Voth G, Moreno M, Loura L Inorg Chem. 2024; 63(24):10897-10914.

PMID: 38795015 PMC: 11186012. DOI: 10.1021/acs.inorgchem.4c00972.


Novel non-helical antimicrobial peptides insert into and fuse lipid model membranes.

Mitra S, Chandersekhar B, Li Y, Coopershlyak M, Mahoney M, Evans B Soft Matter. 2024; 20(20):4088-4101.

PMID: 38712559 PMC: 11109824. DOI: 10.1039/d4sm00220b.


References
1.
Greenwood A, Tristram-Nagle S, Nagle J . Partial molecular volumes of lipids and cholesterol. Chem Phys Lipids. 2006; 143(1-2):1-10. PMC: 2695672. DOI: 10.1016/j.chemphyslip.2006.04.002. View

2.
Reinl H, Brumm T, Bayerl T . Changes of the physical properties of the liquid-ordered phase with temperature in binary mixtures of DPPC with cholesterol: A H-NMR, FT-IR, DSC, and neutron scattering study. Biophys J. 2009; 61(4):1025-35. PMC: 1260362. DOI: 10.1016/S0006-3495(92)81910-0. View

3.
Tristram-Nagle S . Preparation of oriented, fully hydrated lipid samples for structure determination using X-ray scattering. Methods Mol Biol. 2007; 400:63-75. PMC: 2697614. DOI: 10.1007/978-1-59745-519-0_5. View

4.
Nagle J . Area/lipid of bilayers from NMR. Biophys J. 1993; 64(5):1476-81. PMC: 1262472. DOI: 10.1016/S0006-3495(93)81514-5. View

5.
Sun , Suter , Knewtson , Worthington , Zhang , Nagle . Order and disorder in fully hydrated unoriented bilayers of gel-phase dipalmitoylphosphatidylcholine. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1994; 49(5):4665-4676. DOI: 10.1103/physreve.49.4665. View