ArticleJournal of magnetic resonance (San Diego, Calif. : 1997)2015
Optimization of bicelle lipid composition and temperature for EPR spectroscopy of aligned membranes.
Article in Journal of magnetic resonance (San Diego, Calif. : 1997), 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
5 citing papers in PubMed, 7 citations in OpenAlex.
- Studies of transmembrane peptides by pulse dipolar spectroscopy with semi-rigid TOPP spin labels.European biophysics journal : EBJ · 2021Review
- PELDOR/DEER: An Electron Paramagnetic Resonance Method to Study Membrane Proteins in Lipid Bilayers.Methods in molecular biology (Clifton, N.J.) · 2020Article
- Low- q Bicelles Are Mixed Micelles.The journal of physical chemistry letters · 2018Article
- Membrane Disruption Mechanism of a Prion Peptide (106-126) Investigated by Atomic Force Microscopy, Raman and Electron Paramagnetic Resonance Spectroscopy.The journal of physical chemistry. B · 2017Article
- A bifunctional spin label reports the structural topology of phospholamban in magnetically-aligned bicelles.Journal of magnetic resonance (San Diego, Calif. : 1997) · 2016Article
Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
We have optimized the magnetic alignment of phospholipid bilayered micelles (bicelles) for EPR spectroscopy, by varying lipid composition and temperature. Bicelles have been extensively used in NMR spectroscopy for several decades, in order to obtain aligned samples in a near-native membrane environment and take advantage of the intrinsic sensitivity of magnetic resonance to molecular orientation. Recently, bicelles have also seen increasing use in EPR, which offers superior sensitivity and orientational resolution. However, the low magnetic field strength (less than 1 T) of most conventional EPR spectrometers results in homogeneously oriented bicelles only at a temperature well above physiological. To optimize bicelle composition for magnetic alignment at reduced temperature, we prepared bicelles containing varying ratios of saturated (DMPC) and unsaturated (POPC) phospholipids, using EPR spectra of a spin-labeled fatty acid to assess alignment as a function of lipid composition and temperature. Spectral analysis showed that bicelles containing an equimolar mixture of DMPC and POPC homogeneously align at 298 K, 20 K lower than conventional DMPC-only bicelles. It is now possible to perform EPR studies of membrane protein structure and dynamics in well-aligned bicelles at physiological temperatures and below.
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