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Biophys. J. BioFAST: First Published January 21, 2005. doi:10.1529/biophysj.104.056606
© 2005 by the Biophysical Society.

A more recent version of this article appeared on April 1, 2005.
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Norbert Kucerka
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MEMBRANES

Structure of fully hydrated fluid phase DMPC and DLPC lipid bilayers using X-ray scattering from oriented multilamellar arrays and from unilamellar vesicles

Norbert Kucerka 1, Yufeng Liu 2, Nanjun Chu 2, Horia I Petrache 3, Stephanie A. Tristram-Nagle 4 and John F Nagle 5*

1 Carnegie Mellon
2 CMU
3 NIH
4 Carnegie Mellon Univ.
5 Carnegie Mellon University

* To whom correspondence should be addressed. E-mail: nagle{at}andrew.cmu.edu.

Submitted on November 19, 2004
Revised on December 14, 2004
Accepted on 3 January 2005


  Abstract
Quantitative structures of the fully hydrated fluid phases of dimyristoylphosphatidylcholine (DMPC) and dilauroylphosphatidylcholine (DLPC) were obtained at 30oC. Data for the relative form factors F(qz) for DMPC were obtained using a combination of four methods. (1) Volumetric data provided F(0). (2) Diffuse X-ray scattering from oriented stacks of bilayers provided relative form factors |F(qz)| for high qz, 0.22< qz <0.8 Å-1. (3) X-ray scattering from extruded unilamellar vesicles (ULV) with diameter 600 Å, provided |F(qz)| for low qz. (4) Previous measurements using a liquid crystallographic X-ray method provided |F(2ph/D)| for h=1 and 2 for a range of nearly fully hydrated D spacings. The data from (4) overlap and validate the new ULV data for DMPC, so method (4) is not required for DLPC or future studies. We used hybrid electron density models to obtain structural results from these form factors. Comparison of the model electron density profiles with that of gel phase DMPC provides areas per lipid A=60.6±0.5 for DMPC and 63.7±0.5 Å2 for DLPC. Constraints on the model provided by volume measurements and component volumes obtained from simulations put the electron density profiles r(z) and the corresponding form factors F(qz) on absolute scales. Various thicknesses, such as the hydrophobic thickness and the steric thickness, are obtained and compared to literature values.

Key Words: Electron density profiles, Hydrophobic thickness, Lipid Area, Lipid bilayers, Lipid hydration, X-ray scattering




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Copyright © 2005 by the Biophysical Society.