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Biophys. J. BioFAST: First Published May 16, 2008. doi:10.1529/biophysj.108.134858
© 2008 by the Biophysical Society.

A more recent version of this article appeared on July 15, 2008.
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BIOPHYSICAL LETTERS

Molecular Motion at the Critical Point in Lipid Membranes

Harden McConnell 1 and Arun Radhakrishnan 2*

1 Stanford Univeristy
2 University of Texas Southwestern Medical Center

* To whom correspondence should be addressed. E-mail: arun314{at}yahoo.com.

Submitted on April 6, 2008
Revised on April 28, 2008
Accepted on 12 May 2008


  Abstract
It is shown that the calculated temperature dependence of the deuterium NMR of labeled cholesterol-phospholipid bilayers is changed by magic angle spinning. This makes it possible to distinguish different molecular motions at temperatures near a miscibility critical point, for motions with distinct temperature dependent correlation times. In this way one finds that NMR line broadening due to critical point composition fluctuations can be distinguished from broadening due to the formation and dissociation of complexes.

Key Words: condensed complexes, critical points, fluctuations, magic angle spinning, reaction kinetics






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Copyright © 2008 by the Biophysical Society.