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Critical fluctuations in domain-forming lipid mixtures
Open accessAbstract
Critical fluctuations are investigated in lipid membranes near miscibility critical points in bilayers composed of dioleoylphosphatidylcholine, chain perdeuterated dipalmitoylphosphatidylcholine, and cholesterol. Phase boundaries are mapped over the temperature range from 10°C to 60°C by deuterium NMR. Tie-lines and three-phase triangles are evaluated across two-phase and three-phase regions, respectively. In addition, a line of miscibility critical points is identified. NMR resonances are broadened in the vicinity of critical points, and broadening is attributed to increased transverse relaxation rates arising from modulation of chain order with correlation times on a microsecond time scale. We conclude that spectral broadening arises from composition fluctuations in the membrane plane with dimensions of <50 nm and speculate that similar fluctuations are commonly found in cholesterol-containing membranes.
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Cited by
Revitalizing membrane rafts: new tools and insights
Simons, K., & Gerl, M. J. (2010) · Nature Reviews Molecular Cell Biology · doi:10.1038/nrm2977 · Cited by 1,234
Are Biological Systems Poised at Criticality?
Mora, T., & Bialek, W. (2011) · Journal of Statistical Physics · doi:10.1007/s10955-011-0229-4 · Cited by 734
Critical Fluctuations in Plasma Membrane Vesicles
Veatch, S. L., Cicuta, P., Sengupta, P., Honerkamp-Smith, A., Holowka, D., & Baird, B. (2008) · ACS Chemical Biology · doi:10.1021/cb800012x · Cited by 468
Self-citationHonerkamp-Smith, A. R., Veatch, S. L., & Keller, S. L. (2009) · Biochimica et Biophysica Acta (BBA) - Biomembranes · doi:10.1016/j.bbamem.2008.09.010 · Cited by 286
Self-citationMolecular View of Cholesterol Flip-Flop and Chemical Potential in Different Membrane Environments
Bennett, W. F. D., MacCallum, J. L., Hinner, M. J., Marrink, S. J., & Tieleman, D. P. (2009) · Journal of the American Chemical Society · doi:10.1021/ja903529f · Cited by 279
Metadata
- Authors
- Veatch, S. L., Soubias, O., Keller, S. L., & Gawrisch, K.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2007-11-06
- Volume
- 104
- Issue
- 45
- Pages
- 17650-17655
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W1987033415
- Cited by
- 442
- References
- 0
- FWCI
- 8.62
- Type
- journal article
- Language
- en
- Open access
- green
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- Veatch, S. L., Soubias, O., Keller, S. L., & Gawrisch, K. (2007). Critical fluctuations in domain-forming lipid mixtures. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0703513104
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