A New Monofluorinated Phosphatidylcholine Forms Interdigitated Bilayers
| Autor: | Nancy Lazaro, Jacob Schaefer, Joan M. Boggs, Jack Blazyk, Thomas J. McIntosh, Lee R. Wright, Donald J. Hirsh |
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| Rok vydání: | 1998 |
| Předmět: |
Models
Molecular 1 2-Dipalmitoylphosphatidylcholine Lipid Bilayers Molecular Conformation Biophysics Analytical chemistry Palmitic Acids Phosphoglyceride law.invention chemistry.chemical_compound Differential scanning calorimetry X-Ray Diffraction law Phase (matter) Phosphatidylcholine Spectroscopy Fourier Transform Infrared Lipid bilayer Electron paramagnetic resonance Nuclear Magnetic Resonance Biomolecular Calorimetry Differential Scanning Bilayer Electron Spin Resonance Spectroscopy technology industry and agriculture Crystallography chemistry Dipalmitoylphosphatidylcholine Phosphatidylcholines Thermodynamics lipids (amino acids peptides and proteins) Research Article |
| Zdroj: | Biophysical Journal. 75:1858-1868 |
| ISSN: | 0006-3495 |
| DOI: | 10.1016/s0006-3495(98)77626-x |
| Popis: | 16-Fluoropalmitic acid was synthesized from 16-hydroxypalmitic acid using diethylaminosulfur trifluoride. This monofluorinated fatty acid then was used to make 1-palmitoyl-2-[16-fluoropalmitoyl]-phosphatidylcholine (F-DPPC) as a fluorinated analog of dipalmitoylphosphatidylcholine (DPPC). Surprisingly, we found that the phase transition temperature (Tm) of F-DPPC occurs near 50 degrees C, approximately 10 degrees C higher than its nonfluorinated counterpart, DPPC, as judged by both differential scanning calorimetry and infrared spectroscopy. The pretransition observed for DPPC is absent in F-DPPC. A combination of REDOR, rotational-echo double-resonance, and conventional solid-state NMR experiments demonstrates that F-DPPC forms a fully interdigitated bilayer in the gel phase. Electron paramagnetic resonance experiments show that below Tm, the hydrocarbon chains of F-DPPC are more motionally restricted than those of DPPC. X-ray scattering experiments confirm that the thickness and packing of gel phase F-DPPC is similar to that of heptanetriol-induced interdigitated DPPC. F-DPPC is the first phosphoglyceride containing sn-1 and sn-2 ester-linked fatty acyl chains of equal length that spontaneously forms interdigitated bilayers in the gel state in the absence of inducing agents such as alcohols. |
| Databáze: | OpenAIRE |
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